15828( 22) - 29-Dec-2020 18:23:08 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15828 Version: 22 Check-in Time: 29-Dec-2020 18:23:08 STScI Edit Number: 17 Title Essential observations of the stellar and nebular He II emission in two extreme metal-poor starbursts. ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Aida Wofford Universidad Nacional Autonoma de Mexico, Y Obs. Astron. Nac. CoI: Prof. Matthew James Hayes Stockholm University N CoI: Dr. Jacopo Chevallard CNRS, Institut d'Astrophysique de Paris N CoI: Dr. Edmund Christian Herenz European Southern Observatory - Chile N CoI: Dr. Linda J. Smith Space Telescope Science Institute - ESA N ------------------------------------------------------------------------------------ Abstract We propose COS G160M observations of cluster NGC 3125-A1, which based on STIS G140L data has the strongest (EW=7 Ang) broad (FWHM~1200 km/s) stellar He II 1640 emission among nearby metal-poor starburst galaxies. This will enable to: i) separate stellar, nebular, and/or neutral-ISM contributions to the high-ionization UV lines C IV 1548, 1551 and He II 1640; ii) better constrain the number of very massive stars via modeling of the stellar He II and C IV lines; and iii) better study the feedback from the extreme starburst via nebular-emission and ISM-absorption lines. The galaxy has complementary COS G130M spectroscopy available. In addition, we request co-spatial STIS 52"x0.2" G140L + G230L + G430L observations of super star clusters 4 and 5 in SBS 0335-052E, which is one of the nearest, most-metal poor starburst galaxies known. The available COS G160M spectrum of SBS 0335-052E integrates the light of four super star clusters (3, 4, 5, 6) making the interpretation of the purely-nebular (FWHM~160 km/s) He II line in the galaxy difficult and uncertain. High-ionization UV emission lines of C IV, He II, O III] and C III] are detected in the COS data of SBS 0335-052E and with STIS we will be able to spatially resolve the contributions from clusters 4 and 5 to these lines and determine the size of the He II Stromgren sphere. We will use the co-spatial UV+optical data to test for the *first time* simple stellar population models near the low-metallicity limit of the nearby universe, simultaneously in the UV and optical, which is not possible using ground-based optical, and is necessary in preparation to observations of distant galaxies with future large telescopes, like JWST. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use COS G160M for target NGC 3125-A1, at the same coordinates as the archival COS G130M observation. Target acquisition. We will use the same strategy as for the G130M observation, which was successful. Spectroscopy. We will use two central wavelengths, 1600 and 1623 (in order to fill the FUV detector gap), the time-tag mode, and all FP-POS settings. Orbits. We used the archival STIS G140L 25"x2" observation of the target to compute the number of orbits required to get He II 1640 at the desired SNR. 15828( 22) - 29-Dec-2020 18:23:08 - [ 2] We will use the STIS 52"x0.2" long slit to simultaneously observe super star clusters 4 and 5 in SBS 0335-052E. Orient. The two clusters are along the line North-South in the WCS, so the PA angle is zero. Target acquisition. We will use the CCD F28x50LP configuration in ACQ mode and the exposure time necessary to reach a SNR of 100. Spectroscopy. We will use the three gratings G140L and G430L in ACCUM mode. Orbits. We used archival COS and MUSE spectroscopy to compute the number of orbits required to reach the desired SNR at He II 4686 and He II 1640 with G430L and G140L, respectively. ------------------------------------------------------------------------------------ 15828( 22) - 29-Dec-2020 18:23:08 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-3125 EXT-CLUSTER, EMISSION RA=10H06M33.2800S +/- 0.004", J2000 V = 13.0 +/- 0.5 F(1300) = 2e-15 LINE NEBULA, STAR DEC=-29D56'6.80" +/- 0.06" FORMING REGION Reference Frame: ICRS Extended: NO Comments: The coordinates match those of the previous observation with COS G130M (proposal 12172) as provided by the MAST archive. The uncertainties were obtained by calculating the offset between the above coordinates and those of the centroid, which were measured using the COS NUV MIRRORA image of proposal 12172 with ds9. ------------------------------------------------------------------------------------------------------------------------------------ 3 SBS0335-052E STAR, F0-F2 RA=03H37M48.0762S +/- 0.1", J2000 V = 15.4 -OFFSET DEC=-05D02'9.94" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 6 SBS0335-052E STAR, F0-F2 RA=03H37M48.0200S +/- 0.1", J2000 V = 15.4 -OFFSET-COPY DEC=-05D02'8.95" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 SBS0335-052E GALAXY, DWARF COMPACT, RA-OFF=-4.075S, J2000 V = 19.0 -5 STARBURST DEC-OFF=-29.124", FROM 3 Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 5 SBS0335-052E GALAXY, DWARF COMPACT, RA-OFF=-4.073S, DEC-OFF=-29.18", J2000 V = 19.0 -5-COPY STARBURST FROM 6 Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15828( 22) - 29-Dec-2020 18:23:08 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.5 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15828( 22) - 29-Dec-2020 18:23:08 - [ 5] Visit: 02 Visit Requirements: 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-3125 COS/NUV ACQ/IMA PSA MIRRORA 1 2 S (2 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-3125 COS/FUV TIME-TA PSA G160M 1600 BUFFER-TIME=9926, FP-POS=ALL 1 1300 S G see below (4978 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-3125 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=10574, FP-POS=ALL 1 1300 S G see below (5368 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-3125 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 1 1 1147 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 2 1 1147 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 3 2 1342.0 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 4 2 1342.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 1 3 1342.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 2 3 1342.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 3 4 1342.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 4 4 1342.0 S G 15828( 22) - 29-Dec-2020 18:23:08 - [ 6] Visit: 03 (SBS0335-052E) Visit Requirements: ORIENT 345D TO 345 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 SBS0335-052 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) GS ACQ SCENARIO BASE1BE E-OFFSET ------------------------------------------------------------------------------------------------------------------------------------ 2 SBS0335-052 STIS/CCD ACCUM 52X0.2 G430L 4300 CR-SPLIT=NO 1 600 S PATTERN 1 2 E-5 see below (2120 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SBS0335-052 STIS/FUV ACCUM 52X0.2 G140L 1425 1 1200 S PATTERN 1 3 E-5 -MAMA see below (2464 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 | ------------------------------------------------------------------------------------------------------------------------------------ SBS0335-052E-OFFSET 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SBS0335-052E-5 2 STIS/CCD ACCUM 52X0.2 G430L 4300 1 none none none 1 1060.0 S SBS0335-052E-5 2 STIS/CCD ACCUM 52X0.2 G430L 4300 2 none none none 1 1060.0 S SBS0335-052E-5 3 STIS/FUV ACCUM 52X0.2 G140L 1425 1 none none none 2 1232.0 S -MAMA SBS0335-052E-5 3 STIS/FUV ACCUM 52X0.2 G140L 1425 2 none none none 2 1232.0 S -MAMA 15828( 22) - 29-Dec-2020 18:23:08 - [ 7] Visit: H2 (HOPR FOR FAILED 02) Visit Requirements: 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-3125 COS/NUV ACQ/IMA PSA MIRRORA 1 6 S (6 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-3125 COS/FUV TIME-TA PSA G160M 1600 BUFFER-TIME=9926, FP-POS=ALL 1 1300 S G see below (4880 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-3125 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=10574, FP-POS=ALL 1 1300 S G see below (5188 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-3125 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 1 1 1143.0 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 2 1 1143.0 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 3 2 1297.0 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 4 2 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 1 3 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 2 3 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 3 4 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 4 4 1297.0 S G 15828( 22) - 29-Dec-2020 18:23:08 - [ 8] Visit: H3 (HOPR FOR FAILED 03) Visit Requirements: On Hold Comments: Additional Comments: This is a HOPR repeat (1 orbit) for failed visit 03 (2 orbits). 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 SBS0335-052 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) GS ACQ SCENARIO BASE1BE E-OFFSET-CO PY ------------------------------------------------------------------------------------------------------------------------------------ 2 SBS0335-052 STIS/CCD ACQ/PEA 52X0.1 MIRROR 1 50 S (50 E-5-COPY K S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SBS0335-052 STIS/FUV ACCUM 52X0.2 G140L 1425 1 1200 S PATTERN 1 3 E-5-COPY -MAMA see below (1258 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 | ------------------------------------------------------------------------------------------------------------------------------------ SBS0335-052E-OFFSET 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A -COPY SBS0335-052E-5-COPY 2 STIS/CCD ACQ/PEA 52X0.1 MIRROR none none none none 1 N/A K SBS0335-052E-5-COPY 3 STIS/FUV ACCUM 52X0.2 G140L 1425 1 none none none 1 629.0 S -MAMA SBS0335-052E-5-COPY 3 STIS/FUV ACCUM 52X0.2 G140L 1425 2 none none none 1 629.0 S -MAMA 15828( 22) - 29-Dec-2020 18:23:08 - [ 9] Visit: P2 (HOPR FOR FAILED H2) Visit Requirements: 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-3125 COS/NUV ACQ/IMA PSA MIRRORA 1 6 S (6 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-3125 COS/FUV TIME-TA PSA G160M 1600 BUFFER-TIME=9926, FP-POS=ALL 1 1300 S G see below (4880 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-3125 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=10574, FP-POS=ALL 1 1300 S G see below (5188 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-3125 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 1 1 1143.0 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 2 1 1143.0 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 3 2 1297.0 S G NGC-3125 2 COS/FUV TIME-TA PSA G160M 1600 none none none 4 2 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 1 3 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 2 3 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 3 4 1297.0 S G NGC-3125 3 COS/FUV TIME-TA PSA G160M 1623 none none none 4 4 1297.0 S G 15828( 22) - 29-Dec-2020 18:23:08 - [ 10] Summary Form for Proposal 15828 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1, 52X0.2, F28X50LP, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/IMAGE, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=10574, BUFFER-TIME=9926, CR-SPLIT=NO, FP-POS=ALL ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1BE, ORIENT 345D TO 345 D, PATTERN 1 2, PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G160M, G430L, MIRROR, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-3125, SBS0335-052E-5, SBS0335-052E-5-COPY, SBS0335-052E-OFFSET, SBS0335-052E-OFFSET-COPY ------------------------------------------------------------------------------------------------------------------------------------