16435( 4) - 30-Oct-2020 18:43:06 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16435 Version: 4 Check-in Time: 30-Oct-2020 18:43:06 STScI Edit Number: 1 Title Imaging of Arp 143 ------------------------------------------------------------------------------------ Type Cycle GO/DD 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Christopher Britt Space Telescope Science Institute Y CoI: Max Mutchler Space Telescope Science Institute Y CoI: Quyen Hart Space Telescope Science Institute Y CoI: Joseph DePasquale Space Telescope Science Institute N CoI: Alyssa Pagan Space Telescope Science Institute N CoI: Christine Pulliam Space Telescope Science Institute N CoI: Cheryl Gundy Space Telescope Science Institute N CoI: Holly Ryer (Greathouse) Space Telescope Science Institute N CoI: Ray Villard Space Telescope Science Institute N CoI: Elizabeth Rafferty Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We propose to obtain imaging of the interacting galaxies Arp 143 with 3 broadband ACS filters F475W, F606W, and F814W as well as the WFC3 Ha+NII narrowband filter F665N. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will obtain high signal-to-noise imaging of the interacting galaxies Arp 143, or NGC 2444, with both broad and narrowband optical filters using the ACS/WFC and WFC3/UVIS instruments. These new optical images will complement existing archival observations in F606W taken with ACS as part of program 15446 (PI: J. Dalcanton). The existing F606W observations are two 390s exposures. We propose to take additional ACS F606W exposures both to enable cosmic ray rejection and raise the S/N, in addition to new F475W and F814W observations. Altogether, we request 6 orbits to make these observations. Using Arp 220 as a template spectrum in the ACS/WFC Exposure Tine Calculator, we can achieve a S/N ratio of at least 100 per resolution element in F475W with 3840s of exposure and in F814W with 2580s. To highlight regions with high star formation activity, we will obtain 4140s of WFC3 F665N, which will reach high S/N in those areas. We will obtain an additional 2310s of F606W to supplement what is in the archive, increasing the S/N to well over 100 per resolution element. At the same time as these observations, we can take parallel field observations with WFC3 in F475W and F606W, with 7200s in each. The Low Surface Brightness Galaxy MCG+07-16-015 is nearby to Arp 143 and can be covered as a WFC3 parallel field at an orientation angle of 245 degrees. Arp 143 fits within the ACS field at any orientation, but an orientation of 245 degrees, possible in December 2020, allows the WFC3 parallel field to cover a low surface brightness galaxy as well. Scheduling in December 2020 would be optimal, though is not strictly required. ------------------------------------------------------------------------------------ 16435( 4) - 30-Oct-2020 18:43:06 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2444-ACS GALAXY, INTERACTING RA=07H46M51.5728S, J2000 V = 12.9 B=13.1 GALAXY, TIDAL TAIL DEC=+39D01'7.63" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database.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 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2444-WFC GALAXY, INTERACTING RA=07H46M53.5849S, J2000 V = 12.9 B=13.1 3 GALAXY, TIDAL TAIL DEC=+39D01'39.54" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database.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 ------------------------------------------------------------------------------------------------------------------------------------ 16435( 4) - 30-Oct-2020 18:43:06 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 86 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 35 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16435( 4) - 30-Oct-2020 18:43:06 - [ 4] Visit: 01 (ACS + WFC3 parallel) Visit Requirements: ORIENT 242D TO 248 D On Hold Comments: Additional Comments: 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-2444-AC ACS/WFC ACCUM WFCENTER F475W 1 900 S PATTERN 1 1-4; PAR 4 S (3600 S) WITH 1-3 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2444-AC ACS/WFC ACCUM WFCENTER F606W 1 600 S S (2400 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2444-AC ACS/WFC ACCUM WFCENTER F814W 1 700 S S (2800 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFC3/UVI ACCUM UVIS-CENT F606W 2 1200 S S ER (9600 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-2444-ACS 1 ACS/WFC ACCUM WFCENTER F475W 1 none none none 1 N/A NGC-2444-ACS 1 ACS/WFC ACCUM WFCENTER F475W 2 none none none 2 N/A NGC-2444-ACS 1 ACS/WFC ACCUM WFCENTER F475W 3 none none none 3 N/A NGC-2444-ACS 1 ACS/WFC ACCUM WFCENTER F475W 4 none none none 4 N/A NGC-2444-ACS 2 ACS/WFC ACCUM WFCENTER F606W 1 none none none 1 N/A NGC-2444-ACS 2 ACS/WFC ACCUM WFCENTER F606W 2 none none none 2 N/A NGC-2444-ACS 2 ACS/WFC ACCUM WFCENTER F606W 3 none none none 3 N/A NGC-2444-ACS 2 ACS/WFC ACCUM WFCENTER F606W 4 none none none 4 N/A NGC-2444-ACS 3 ACS/WFC ACCUM WFCENTER F814W 1 none none none 1 N/A NGC-2444-ACS 3 ACS/WFC ACCUM WFCENTER F814W 2 none none none 2 N/A NGC-2444-ACS 3 ACS/WFC ACCUM WFCENTER F814W 3 none none none 3 N/A NGC-2444-ACS 3 ACS/WFC ACCUM WFCENTER F814W 4 none none none 4 N/A ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 1 none 1 none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 1 none 2 none 1 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 2 none 1 none 2 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 2 none 2 none 2 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 3 none 1 none 3 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 3 none 2 none 3 N/A S TER 16435( 4) - 30-Oct-2020 18:43:06 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 4 none 1 none 4 N/A S TER ANY 4 WFC3/UVI ACCUM UVIS-CEN F606W 4 none 2 none 4 N/A S TER 16435( 4) - 30-Oct-2020 18:43:06 - [ 6] Visit: 02 (WFC3 + ACS parallel) Visit Requirements: ORIENT 102D TO 108 D; BEFORE 05-MAR-2021:00:00:00 On Hold Comments: Additional Comments: 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-2444-WF WFC3/UVI ACCUM UVIS-CENT F665N FLASH=17 3 800 S PATTERN 2 1-2; PAR 2 C3 S ER (4800 S) WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFCENTER F606W 1 1200 S (2400 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-2444-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F665N 1 none 1 none 1 N/A S TER NGC-2444-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F665N 1 none 2 none 1 N/A S TER NGC-2444-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F665N 1 none 3 none 1 N/A S TER NGC-2444-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F665N 2 none 1 none 2 N/A S TER NGC-2444-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F665N 2 none 2 none 2 N/A S TER NGC-2444-WFC3 1 WFC3/UVI ACCUM UVIS-CEN F665N 2 none 3 none 2 N/A S TER ANY 2 ACS/WFC ACCUM WFCENTER F606W 1 none none none 1 N/A ANY 2 ACS/WFC ACCUM WFCENTER F606W 2 none none none 2 N/A 16435( 4) - 30-Oct-2020 18:43:06 - [ 7] Summary Form for Proposal 16435 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=17 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 05-MAR-2021:00:00:00, ORIENT 102D TO 108 D, ORIENT 242D TO 248 D, PAR 2 WITH 1, PAR 4 WITH 1-3, PATTERN 1 1-4, PATTERN 2 1-2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F475W, F606W, F665N, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, NGC-2444-ACS, NGC-2444-WFC3 ------------------------------------------------------------------------------------------------------------------------------------