16461( 5) - 20-Aug-2021 21:26:47 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16461 Version: 5 Check-in Time: 20-Aug-2021 21:26:47 STScI Edit Number: 3 Title The Most Extreme Globular Cluster Systems in Low Surface Brightness Galaxies ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Jean Somalwar California Institute of Technology Y CoI: Dr. Peter Melchior Princeton University N CoI: Dr. Johnny P Greco The Ohio State University N CoI: Prof. Jenny Emma Greene Princeton University N CoI: Mr. Lachlan Thomas Lancaster Princeton University N CoI: Dr. Andrew Goulding Princeton University N CoI: Dr. Song Huang Princeton University N CoI: Dr. Rachael Lynn Beaton Princeton University N ------------------------------------------------------------------------------------ Abstract Interest in low surface brightness galaxies (LSBGs) has experienced a renaissance in recent years. Intriguingly, a number of ultra diffuse galaxies, which are LSBGs with dwarf-like stellar masses spread over Milky Way-size areas, have been observed in the Coma cluster with extraordinarily large numbers (>40) of globular clusters (GCs). Since GC abundance correlates with galaxy dark matter halo mass for many galaxies, these LSBGs may have extremely high mass-to-light ratios. However, such GC-rich LSBGs have only been observed in high density, galaxy cluster environments. Can LSBGs in group environments have such extremely large GC systems? We have just completed the first wide-field search for GC-rich LSBGs in Hyper Suprime-Cam data, with a focus on early-type, low-mass LSBGs. We request seven orbits of HST time to study the LSBGs with the largest GC-like point source excesses with imaging from the Advanced Camera for Surveys. With these data, we will be able to tightly constrain the GC abundances in our galaxies to determine whether they are truly the counterparts of the GC-rich LSBGs found in clusters. We will also constrain the GC luminosity functions of our LSBGs to compare to the most likely distances to our LSBGs. Finally, this HST data will provide verification of our ground-based GC search, which will provide invaluable insight for analyzing data from future telescopes like the Vera C. Rubin Observatory. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will spend each full orbit on the F814W band, dividing the exposure into four dithers. After guide-star acquisition (6 min), read-out (6.5 min), and one dither (0.5 min), we are left with 40 min of exposure time, assuming a typical 53 min orbit. We will divide that time evenly into four 500 sec exposures, using the ACS-WFC-DITHER-LINE pattern combined with a subpattern. ------------------------------------------------------------------------------------ 16461( 5) - 20-Aug-2021 21:26:47 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GGS2018-93 GALAXY, DWARF RA=22H53M29.9400S, J2000 V = 19.47 +/- 0.1 ELLIPTICAL, LSB DEC=+00D54'19.30" 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 ------------------------------------------------------------------------------------------------------------------------------------ 2 GGS2018-292 GALAXY, DWARF RA=02H38M46.8300S, J2000 V = 18.87 +/- 0.1 ELLIPTICAL, LSB DEC=-06D14'12.10" 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 ------------------------------------------------------------------------------------------------------------------------------------ 3 GGS2018-318 GALAXY, DWARF RA=02H21M24.9000S, J2000 V = 18.40 +/- 0.1 ELLIPTICAL, LSB DEC=-05D43'58.10" 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 GGS2018-365 GALAXY, DWARF RA=02H01M13.3900S, J2000 V = 20.41 +/- 0.1 ELLIPTICAL, LSB DEC=-05D26'44.60" 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 ------------------------------------------------------------------------------------------------------------------------------------ 5 GGS2018-490 GALAXY, DWARF RA=12H07M43.8100S, J2000 V = 19.49 +/- 0.1 ELLIPTICAL, LSB DEC=+01D10'19.60" 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 ------------------------------------------------------------------------------------------------------------------------------------ 16461( 5) - 20-Aug-2021 21:26:47 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 6 GGS2018-748 GALAXY, DWARF RA=11H58M16.7200S, J2000 V = 20.68 +/- 0.1 ELLIPTICAL, LSB DEC=-01D29'21.20" 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 ------------------------------------------------------------------------------------------------------------------------------------ 7 GGS2018-749 GALAXY, DWARF RA=11H58M32.0400S, J2000 V = 20.37 +/- 0.1 ELLIPTICAL, LSB DEC=-01D51'28.40" 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 ------------------------------------------------------------------------------------------------------------------------------------ 16461( 5) - 20-Aug-2021 21:26:47 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 3.034 0.145 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.29 47.23 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 16461( 5) - 20-Aug-2021 21:26:47 - [ 5] Visit: 01 (GGS2018-93) 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 GGS2018-93 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2060 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 515.0 S GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 515.0 S GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 515.0 S GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 515.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 6] Visit: 02 (GGS2018-292) 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 GGS2018-292 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2064 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-292 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 516.0 S GGS2018-292 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 516.0 S GGS2018-292 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 516.0 S GGS2018-292 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 516.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 7] Visit: 03 (GGS2018-318) 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 GGS2018-318 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2064 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-318 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 516.0 S GGS2018-318 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 516.0 S GGS2018-318 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 516.0 S GGS2018-318 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 516.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 8] Visit: 04 (GGS2018-365) 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 GGS2018-365 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2064 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 516.0 S GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 516.0 S GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 516.0 S GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 516.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 9] Visit: 05 (GGS2018-490) 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 GGS2018-490 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2060 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-490 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 515.0 S GGS2018-490 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 515.0 S GGS2018-490 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 515.0 S GGS2018-490 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 515.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 10] Visit: 06 (GGS2018-748) 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 GGS2018-748 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2060 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 515.0 S GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 515.0 S GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 515.0 S GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 515.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 11] Visit: 07 (GGS2018-749) 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 GGS2018-749 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2060 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-749 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 515.0 S GGS2018-749 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 515.0 S GGS2018-749 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 515.0 S GGS2018-749 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 515.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 12] Visit: 56 (GGS2018-748) 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 GGS2018-748 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2060 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 515.0 S GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 515.0 S GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 515.0 S GGS2018-748 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 515.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 13] Visit: R1 (GGS2018-93) 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 GGS2018-93 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2060 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 515.0 S GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 515.0 S GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 515.0 S GGS2018-93 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 515.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 14] Visit: R4 (Repeat of GGS2018-365) 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 GGS2018-365 ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2064 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 | ------------------------------------------------------------------------------------------------------------------------------------ GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 1 1 none none 1 516.0 S GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 1 2 none none 1 516.0 S GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 2 1 none none 1 516.0 S GGS2018-365 1 ACS/WFC ACCUM WFC1-FIX F814W 2 2 none none 1 516.0 S 16461( 5) - 20-Aug-2021 21:26:47 - [ 15] Summary Form for Proposal 16461 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GGS2018-292, GGS2018-318, GGS2018-365, GGS2018-490, GGS2018-748, GGS2018-749, GGS2018-93 ------------------------------------------------------------------------------------------------------------------------------------