17140( 3) - 18-Oct-2022 13:39:17 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17140 Version: 3 Check-in Time: 18-Oct-2022 13:39:17 STScI Edit Number: 0 Title Toward an observational test of the Lambda CDM hierarchical paradigm at the smallest galaxy scales ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Francesca Annibali Y CoI: Dr. Alessandra Aloisi Space Telescope Science Institute N CoI: Dr. Giacomo Beccari European Southern Observatory - Germany N CoI: Dr. Michele Bellazzini N CoI: Dr. Michele Cignoni Universita di Pisa N CoI: Dr. Matteo Correnti INAF - Osservatorio Astronomico di Roma N CoI: Dr. Felice Cusano INAF-Osservatorio di Astrofisica e Scienza N dello Spazio CoI: Dr. Leslie Hunt INAF - Osservatorio Astrofisico di Arcetri N CoI: Dr. Carlo Nipoti Universita di Bologna N CoI: Dr. Elena Sacchi Leibniz-Institut für Astrophysik Potsdam N (AIP) CoI: Dr. Monica Tosi N CoI: Dr. Raffaele Pascale INAF-Osservatorio di Astrofisica e Scienza N dello Spazio CoI: Prof. John Michael Cannon Macalester College N CoI: Giacomo Bortolini Stockholm University N CoI: Dr. Federico Marinacci Universita di Bologna N ------------------------------------------------------------------------------------ Abstract Deep, wide-field ground-based imaging has led to the discovery of low-surface brightness tidal features around three small dwarf galaxies (with stellar masses between 10^7 and 10^8 Msun) at distances between 3 and 4 Mpc: UGC 8760, UGC 6541, and NGC 5238. The three galaxies are isolated, without any identifiable companion that could cause the observed tidal disturbances. Of 45 dwarf galaxies imaged to comparable depth, they are the only strong candidates of dwarfs in the process of accreting smaller satellites, thus a signature of hierarchical structure assembly on the smallest scales. Remarkably, direct evidence of satellite accretion has so far been observed in dwarfs typically more massive than these. Preliminary N-body hydrodynamical simulations suggest that the merger events occurred no longer than ~1 Gyr ago. To confirm this hypothesis, we propose new deep ACS imaging in V and I that will enable the characterization of the stellar populations of the host dwarfs and of their satellites' remnants, and to infer their detailed star formation history (SFH) over the last ~1 Gyr. Analysis of these new data will potentially reveal the presence of starbursts triggered by pericenter passages during the interaction. Together with the galaxy kinematical properties, the SFHs will provide a crucial ingredient for N-body hydrodynamical simulations aimed at reconstructing the properties of the dwarf progenitors and their merging history. Ultimately, these results will be compared with cosmological simulations that predict the satellite population around dwarf galaxies of different masses, providing a first test of the 17140( 3) - 18-Oct-2022 13:39:17 - [ 2] Lambda CDM hierarchical paradigm at the smallest galaxy scales. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe three dwarf irregular galaxies: Mrk 178, UGC-8760, and NGC-5238. For Mrk 178, one ACS pointing is sufficient to cover the whole galaxy. For UGC-8760, and NGC-5238, two pointings are needed for each galaxy. Mrk178: Three visits, Mrk178_vis01_V, Mrk178_vis02_I and Mrk178_vis03_I are planned for this galaxy. Mrk178_vis01_V extends for 3 orbits. We will perform exposures in F606W with ACS/WFC. Sub-exposures of ~550 s each will be performed according to a primary 3-point dither-line pattern (to fill the gap between the ACS detectors) coupled with a 4 point-box sub-dither (to improve PSF sampling), for a total of 12 sub-exposures. All chosen dither types are the defauld "convenience" patterns for ACS/WFC. We constrain the orientation angle to be in the range 260-280 degrees. This choice allows for an optimal coverage of both the galaxy and the extended low surface brightness regions, while maximizing schedulability. Mrk178_vis02_I and Mrk178_vis03_I adopt the same strategy as Mrk178_vis01_V, except for the F814W filter. We need twice as long exposure time in I than in V to reach the required depth. This implies 6 orbits in total in I, which are splitted into 2 separate visits (vis02 and vis03). We require the same orient as for visit 01, in order to have coverage of the observed sources in both V and I. UGC8760_P1 s observed in two separate visits: UGC8760_P1_vis04_V and UGC8760_P1_vis05_I. Vis04 lasts for 1 orbit and vis05 for 2 orbits. We use the F606W filter in vis04 and F814W in vis05. We adopt a dither-line pattern with 5 points spaced by 0.7585 arcsec. The total offest from point 1 to point 5 equals the offset of 3.034 of the convenience ACS/WFC dither line pattern typically used to fill the gap between the detectors. We selected 2 ranges of orients that avoid the gap to fall on the low surface brightness features. UGC8760_P2 is observed in 3 visits. UGC8760_P2_vis06_V is the same as vis04 except for a pointing shift. UGC8760_P2_vis07_I is the same as vis05 except for a pointing shift. UGC8760_P2_VIS08_VI lasts for 1 orbit and we perform both F606W and F814W observations, each with a half orbit duration. We choose a convenience 2 point dither-line pattern optimized for ACS/WFC. Thus we have 2 sub-exposures in V and 2 in I. we request the same orient of visit 07 qnd 08. NGC5238-P1 is observed in 3 visits. NGC5238-P1_vis09_V performs observations in F606W and lasts for 3 orbits. We adopt a 3 point - line primary dither pattern coupled with a 4 point box dither, for a total of 12 sub-exposures. The adopted dither patterns are the convenience ones for ACS/WFC. Orient ranges are chosen to avoid the gap to fall on the low surface brightness 17140( 3) - 18-Oct-2022 13:39:17 - [ 3] structure to the south. NGC5238-P1_vis10_I is the same as visti 09 except that observations are done in F814W. We request the same orient as visit 09. NGC5238-P1_vis11_I is the as same as visit 10, except that we adopt a 2 point line primary dither coupled with a 4 point box secondary dither, for a total of 8 exposures in 2 orbits. For NGC5238-P2, the observation strategy is the same as for NGC5238-P1. For all three targets, but particularly for Mrk178, the orient constraints translate into limited visibility. Therefore any reduction of the visibility windows from a reduced gyro operations could highly affect the possibility of completing this project. ------------------------------------------------------------------------------------ 17140( 3) - 18-Oct-2022 13:39:17 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 UGC-8760-POI GALAXY, AMORPHOUS RA=13H50M48.4174S, J2000 V = 13.77 NT1 IRREGULAR DEC=+38D00'51.54" Reference Frame: Other: SIMBAD Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 1.0011166375183201E-4 -4.859999762629741E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 UGC-8760-POI GALAXY, AMORPHOUS RA=13H50M56.7279S, J2000 V = 13.77 NT2 IRREGULAR DEC=+38D02'50.41" Reference Frame: Other: SIMBAD Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 1.0011166375183201E-4 -4.859999762629741E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 MRK-178 GALAXY, AMORPHOUS RA=11H33M28.7981S, J2000 V = 14.3 IRREGULAR DEC=+49D14'12.01" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-5238-P1 GALAXY, AMORPHOUS RA=13H34M43.0965S, J2000 V = 13.2 IRREGULAR DEC=+51D35'57.82" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -7.085791625616834E-6 -1.2500004231696948E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-5238-P2 GALAXY, AMORPHOUS RA=13H34M41.9313S, J2000 V = 13.2 IRREGULAR DEC=+51D38'22.84" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -7.085791625616834E-6 -1.2500004231696948E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17140( 3) - 18-Oct-2022 13:39:17 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE ACS-WFC-DITHER-BOX Pattern_Purpose DITHER DITHER Number_Of_Points 3 4 Point_Spacing 3.034 0.2637 Line_Spacing 0.1856 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.29 20.7 Angle_Between_Sides 69.02 Center_Pattern YES NO Pattern_Comments: Primary dither: 3-point line Secondary dither: 4-point box ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 5 Point_Spacing 0.7585 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 3.034 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17140( 3) - 18-Oct-2022 13:39:17 - [ 6] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE ACS-WFC-DITHER-BOX Pattern_Purpose DITHER DITHER Number_Of_Points 2 4 Point_Spacing 3.034 0.2637 Line_Spacing 0.1856 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.29 20.7 Angle_Between_Sides 69.02 Center_Pattern NO NO Pattern_Comments: primary: 2 point dither line secondary: 4 point dither box ------------------------------------------------------------------------------------------------------------------------------------ 17140( 3) - 18-Oct-2022 13:39:17 - [ 7] Visit: 01 (Mrk178_vis01_V) Visit Requirements: ORIENT 260D TO 280 D On Hold Comments: Additional Comments: This visit extends for 3 orbits. We will perform exposures in F606W with ACS/WFC. The individual sub-exposures of ~550 s each will be performed according to a primary 3-point dither-line pattern (to fill the gap between the ACS detectors) coupled with a 4 point-box sub-dither (to improve PSF sampling), for a total of 12 sub-exposures. All chosen dither types are the defauld "convenience" patterns for ACS/WFC. We constrain the orientation angle to be in the range 260-280 degrees. This choice allows for an optimal coverage of both the galaxy and the extended low surface brightness regions, while maximizing schedulability. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MRK-178 ACS/WFC ACCUM WFC F606W 1 550 S PATTERN 1 1 (6760 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ MRK-178 1 ACS/WFC ACCUM WFC F606W 1 1 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F606W 1 2 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F606W 1 3 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F606W 1 4 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F606W 2 1 none none 2 585.0 S MRK-178 1 ACS/WFC ACCUM WFC F606W 2 2 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F606W 2 3 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F606W 2 4 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F606W 3 1 none none 3 585.0 S MRK-178 1 ACS/WFC ACCUM WFC F606W 3 2 none none 3 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F606W 3 3 none none 3 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F606W 3 4 none none 3 565.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 8] Visit: 02 (Mrk178_vis02_I) Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: The observation strategy is the same as for visit 01, excpet for the choice of the F814W filter. We need twice as long exposure time in I than in V to reach the required depth. This implies 6 orbits in total in I, which are splitted into 2 separate visits (vis02 and vis03). We require the same orient as for visit 01, in order to have coverage of the observed sources in both V and I. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MRK-178 ACS/WFC ACCUM WFC F814W 1 550 S PATTERN 1 1 (6760 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ MRK-178 1 ACS/WFC ACCUM WFC F814W 1 1 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 1 2 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 1 3 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 1 4 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 2 1 none none 2 585.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 2 2 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 2 3 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 2 4 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 1 none none 3 585.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 2 none none 3 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 3 none none 3 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 4 none none 3 565.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 9] Visit: 03 (Mrk178_vis03_I) Visit Requirements: SAME ORIENT AS 02 On Hold Comments: Additional Comments: See comments for Mrk178_vis02_I. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MRK-178 ACS/WFC ACCUM WFC F814W 1 550 S PATTERN 1 1 (6760 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ MRK-178 1 ACS/WFC ACCUM WFC F814W 1 1 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 1 2 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 1 3 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 1 4 none none 1 N/A MRK-178 1 ACS/WFC ACCUM WFC F814W 2 1 none none 2 585.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 2 2 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 2 3 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 2 4 none none 2 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 1 none none 3 585.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 2 none none 3 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 3 none none 3 565.0 S MRK-178 1 ACS/WFC ACCUM WFC F814W 3 4 none none 3 565.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 10] Visit: 04 (UGC8760_P1_vis04_V) Visit Requirements: ORIENT 171D TO 285 D; ORIENT 327D TO 100 D On Hold Comments: Additional Comments: This visit lasts for 1 orbit and performs observations of UGC8760 with ACS/WFC in F606W. We have adopted a dither-line pattern with 5 points spaced by 0.7585 arcsec. The total offest from point 1 to point 5 equals the offset of 3.034 of the convenience ACS/WFC dither line pattern typically used to fill the gap between the detectors. We have 5 exposures of ~390 sec each, for a total exposure time of ~1960 sec in F606W. We selected 2 ranges of orients that optimize galaxy coverage. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 UGC-8760-PO ACS/WFC ACCUM WFC F606W 1 340 S PATTERN 2 1 INT1 see below (1965 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F606W 1 none none none 1 393.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F606W 2 none none none 1 393.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F606W 3 none none none 1 393.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F606W 4 none none none 1 393.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F606W 5 none none none 1 393.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 11] Visit: 05 (UGC8760_P1_vis05_I) Visit Requirements: SAME ORIENT AS 04 On Hold Comments: Additional Comments: This visit lasts for 2 orbits and performs observations of UGC8760 with ACS/WFC in F814W. Same as for visit 4, we have adopted a dither-line pattern with 5 points spaced by 0.7585 arcsec. The total offest from point 1 to point 5 equals the offset of 3.034 of the convenience ACS/WFC dither line pattern typically used to fill the gap between the detectors. We have in total 10 exposures of ~390 sec each, for a total exposure time of ~4000 sec in F814W. We request the orient to be the same as for visit 04 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 UGC-8760-PO ACS/WFC ACCUM WFC F814W 1 340 S PATTERN 2 1-2 INT1 see below (2033 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UGC-8760-PO ACS/WFC ACCUM WFC F814W 1 340 S INT1 see below (2047 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 401.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 401.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F814W 3 none none none 1 401.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F814W 4 none none none 2 415.0 S UGC-8760-POINT1 1 ACS/WFC ACCUM WFC F814W 5 none none none 2 415.0 S UGC-8760-POINT1 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 401.0 S UGC-8760-POINT1 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 401.0 S UGC-8760-POINT1 2 ACS/WFC ACCUM WFC F814W 3 none none none 2 415.0 S UGC-8760-POINT1 2 ACS/WFC ACCUM WFC F814W 4 none none none 2 415.0 S UGC-8760-POINT1 2 ACS/WFC ACCUM WFC F814W 5 none none none 2 415.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 12] Visit: 06 (UGC8760_P2_vis06_V) Visit Requirements: SAME ORIENT AS 04 On Hold Comments: Additional Comments: This visit is the same as vis04 except for a pointing shift aimed at observing the low surface brightness tail to the north of UGC 8760. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 UGC-8760-PO ACS/WFC ACCUM WFC F606W 1 350 S PATTERN 2 1 INT2 see below (1965 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F606W 1 none none none 1 393.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F606W 2 none none none 1 393.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F606W 3 none none none 1 393.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F606W 4 none none none 1 393.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F606W 5 none none none 1 393.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 13] Visit: 07 (UGC8760_P2_vis07_I) Visit Requirements: SAME ORIENT AS 04 On Hold Comments: Additional Comments: This visit is the same as vis05 except for a pointing shift aimed at observing the low surface brightness tail to the north of UGC 8760. It covers 2 orbits and performs observations in F814W. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 UGC-8760-PO ACS/WFC ACCUM WFC F814W 1 350 S PATTERN 2 1-2 INT2 see below (2033 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UGC-8760-PO ACS/WFC ACCUM WFC F814W 1 350 S INT2 see below (2047 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 401.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 401.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F814W 3 none none none 1 401.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F814W 4 none none none 2 415.0 S UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F814W 5 none none none 2 415.0 S UGC-8760-POINT2 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 401.0 S UGC-8760-POINT2 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 401.0 S UGC-8760-POINT2 2 ACS/WFC ACCUM WFC F814W 3 none none none 2 415.0 S UGC-8760-POINT2 2 ACS/WFC ACCUM WFC F814W 4 none none none 2 415.0 S UGC-8760-POINT2 2 ACS/WFC ACCUM WFC F814W 5 none none none 2 415.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 14] Visit: 08 (UGC8760_P2_VIS08_VI) Visit Requirements: SAME ORIENT AS 07 On Hold Comments: Additional Comments: This visit lasts 1 orbit and we perform both F606W and F814W observations, each with a half orbit duration. We choose a convenience 2 point dither-line pattern optimized for ACS/WFC. Thus we have 2 sub-exposures in V and 2 in I. we request the same orient of visit 07 qnd 08. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 UGC-8760-PO ACS/WFC ACCUM WFC F606W 1 500 S PATTERN 3 1 INT2 (1000 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UGC-8760-PO ACS/WFC ACCUM WFC F814W 1 500 S PATTERN 3 2 INT2 (1056 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A UGC-8760-POINT2 1 ACS/WFC ACCUM WFC F606W 2 none none none 1 N/A UGC-8760-POINT2 2 ACS/WFC ACCUM WFC F814W 1 none none none 1 N/A UGC-8760-POINT2 2 ACS/WFC ACCUM WFC F814W 2 none none none 1 556.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 15] Visit: 09 (NGC5238-P1_vis09_V) Visit Requirements: ORIENT 350D TO 30 D; ORIENT 145D TO 215 D On Hold Comments: Additional Comments: This visit lasts for 3 orbits and performs observations of the central region of NGC5238 in V. We adopt a 3 point - line primary dither pattern coupled to a 4 point box dither, for a total of 8 sub-exposures. The adopted dither patterns are the convenience ones for ACS/WFC. Within 3 orbits, we perform a total of 12 exposures in V. Orient ranges are chosen to avoid the gap to fall on the low surface brightness structure to the south. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5238-P1 ACS/WFC ACCUM WFC F606W 1 550 S PATTERN 1 1 see below (6912 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 1 1 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 1 2 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 1 3 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 1 4 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 2 1 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 2 2 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 2 3 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 2 4 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 3 1 none none 3 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 3 2 none none 3 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 3 3 none none 3 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F606W 3 4 none none 3 582.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 16] Visit: 10 (NGC5238-P1_vis10_I) Visit Requirements: SAME ORIENT AS 09 On Hold Comments: Additional Comments: Same as visti 09 except that observations are done in F814W. We request the same orient as visit 09. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5238-P1 ACS/WFC ACCUM WFC F814W 1 550 S PATTERN 1 1 see below (6912 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 1 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 2 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 3 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 4 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 1 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 2 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 3 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 4 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 3 1 none none 3 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 3 2 none none 3 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 3 3 none none 3 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 3 4 none none 3 582.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 17] Visit: 11 (NGC5238-P1_vis11_I) Visit Requirements: SAME ORIENT AS 10 On Hold Comments: Additional Comments: Same as visti 10, except that we adopt a 2 point line primary dither coupled with a 4 point box secondary dither, for a total of 8 exposures in 2 orbirs. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5238-P1 ACS/WFC ACCUM WFC F814W 1 550 S PATTERN 4 1 see below (4584 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 1 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 2 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 3 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 1 4 none none 1 564.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 1 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 2 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 3 none none 2 582.0 S NGC-5238-P1 1 ACS/WFC ACCUM WFC F814W 2 4 none none 2 582.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 18] Visit: 12 (NGC5238-P2_vis12_V) Visit Requirements: SAME ORIENT AS 09 On Hold Comments: Additional Comments: Strategy for NGC5238-P1 is repeated for P2. the purpose is to cover the low surface brightness feature to the north. This visit lasts for 3 orbits and performs observations of the central region of NGC5238 in V. We adopt a 3 point - line primary dither pattern coupled to a 4 point box dither, for a total of 8 sub-exposures. The adopted dither patterns are the convenience ones for ACS/WFC. Within 3 orbits, we perform a total of 12 exposures in V. Orient ranges are chosen to avoid the gap to fall on the low surface brightness structure to the south. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5238-P2 ACS/WFC ACCUM WFC F606W 1 550 S PATTERN 1 1 see below (6912 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 1 1 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 1 2 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 1 3 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 1 4 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 2 1 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 2 2 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 2 3 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 2 4 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 3 1 none none 3 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 3 2 none none 3 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 3 3 none none 3 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F606W 3 4 none none 3 582.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 19] Visit: 13 (NGC5238-P2_vis13_I) Visit Requirements: SAME ORIENT AS 10 On Hold Comments: Additional Comments: Same as visit 10, but done at the position of NGC5238-P2. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5238-P2 ACS/WFC ACCUM WFC F814W 1 550 S PATTERN 1 1 see below (6912 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 1 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 2 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 3 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 4 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 1 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 2 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 3 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 4 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 3 1 none none 3 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 3 2 none none 3 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 3 3 none none 3 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 3 4 none none 3 582.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 20] Visit: 14 (NGC5238-P2_vis14_I) Visit Requirements: SAME ORIENT AS 10 On Hold Comments: Additional Comments: Same as visti 11, except that we adopt a 2 point line primary dither coupled with a 4 point box secondary dither, for a total of 8 exposures in 2 orbirs. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5238-P2 ACS/WFC ACCUM WFC F814W 1 550 S PATTERN 4 1 see below (4584 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 1 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 2 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 3 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 1 4 none none 1 564.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 1 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 2 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 3 none none 2 582.0 S NGC-5238-P2 1 ACS/WFC ACCUM WFC F814W 2 4 none none 2 582.0 S 17140( 3) - 18-Oct-2022 13:39:17 - [ 21] Summary Form for Proposal 17140 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 145D TO 215 D, ORIENT 171D TO 285 D, ORIENT 260D TO 280 D, ORIENT 327D TO 100 D, ORIENT 350D TO 30 D, PATTERN 1 1, PATTERN 2 1, PATTERN 2 1-2, PATTERN 3 1, PATTERN 3 2, PATTERN 4 1, SAME ORIENT AS 01, SAME ORIENT AS 02, SAME ORIENT AS 04, SAME ORIENT AS 07, SAME ORIENT AS 09, SAME ORIENT AS 10 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names MRK-178, NGC-5238-P1, NGC-5238-P2, UGC-8760-POINT1, UGC-8760-POINT2 ------------------------------------------------------------------------------------------------------------------------------------