15277( 2) - 06-Dec-2018 16:19:29 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15277 Version: 2 Check-in Time: 06-Dec-2018 16:19:29 STScI Edit Number: 0 Title Weighing Ultra-Diffuse Galaxies: Bridging the environmental gap ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mr. Johnny P Greco Princeton University Y CoI: Prof. Jenny Emma Greene Princeton University N CoI: Dr. Michael A. Strauss Princeton University N ------------------------------------------------------------------------------------ Abstract Interest in ultra-low-surface brightness galaxies has been reignited by the discovery of a substantial population of ultra-diffuse galaxies (UDGs) in dense clusters. These galaxies are characterized by dwarf-like stellar masses spread across giant-galaxy sizes, and their prolonged survival in clusters suggests that they may be extremely dark-matter dominated. The dark matter halos of a handful of UDGs in dense clusters have been "weighed" by the detection of rich globular cluster (GC) systems (~20-100 GCs), and indeed, their inferred mass-to-light ratios (M/L > 1000) are unprecedented for their stellar masses. More recently, galaxies with UDG-like properties have been discovered in much lower-density environments. However, the connection between UDGs across the full range of halo environments remains uncertain. Do extreme mass-to-light ratios persist throughout this population regardless of environment? Or, is this a unique characteristic of UDGs in galaxy clusters? Thanks to the depth and wide-area coverage afforded by our ongoing Hyper Suprime-Cam (HSC) Survey, we are carrying out the first truly blind search for UDGs to address this question. We currently have a sample of ~300 UDG candidates in environments ranging from the field to intermediate-mass groups. We propose to use ACS/WFC imaging to study the GC systems of 10 UDGs selected for their association with poor groups that span a range in environment a factor of ~10 to 100 less dense than Coma. Our program has the potential, for the first time, to establish a connection between the extremely dark-matter dominated UDGs in dense galaxy clusters and those being discovered in much lower-density environments. ------------------------------------------------------------------------------------ Observations Description ------------------------ Observing Plan: We will spend the first full orbit on the F814W band, dividing the exposure into two 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 two 1200 sec exposures, using the ACS-WFC-DITHER-LINE pattern. In the second orbit, guide star aquisition takes only 4 min, so we have a total of 42 min of exposure on F606W, allowing us to reach comparable depths in the two filters. ------------------------------------------------------------------------------------ 15277( 2) - 06-Dec-2018 16:19:29 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 UDG-1A GALAXY, DWARF RA=09H18M45.3141S, J2000 V = 19.73 +/- 0.1 ELLIPTICAL, LSB DEC=+00D24'1.41" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-2A GALAXY, DWARF RA=09H19M45.6059S, J2000 V = 21.05 +/- 0.1 ELLIPTICAL, LSB DEC=+00D47'47.81" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 3 UDG-3A GALAXY, DWARF RA=09H19M55.5500S, J2000 V = 20.21 +/- 0.1 ELLIPTICAL, LSB DEC=+01D07'23.88" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 4 UDG-4A GALAXY, DWARF RA=09H18M55.3503S, J2000 V = 19.86 +/- 0.1 ELLIPTICAL, LSB DEC=+01D45'5.57" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 5 UDG-5A GALAXY, DWARF RA=09H19M59.2126S, J2000 V = 20.03 +/- 0.1 ELLIPTICAL, LSB DEC=+00D48'51.29" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 6 UDG-1B GALAXY, DWARF RA=12H04M46.2387S, J2000 V = 19.45 +/- 0.1 ELLIPTICAL, LSB DEC=+01D17'54.43" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 7 UDG-2B GALAXY, DWARF RA=12H04M7.8421S, J2000 V = 19.89 +/- 0.1 ELLIPTICAL, LSB DEC=+01D19'17.47" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 8 UDG-3B GALAXY, DWARF RA=12H04M33.5750S, J2000 V = 19.88 +/- 0.1 ELLIPTICAL, LSB DEC=+01D24'57.40" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 9 UDG-4B GALAXY, DWARF RA=12H02M37.0450S, J2000 V = 19.71 +/- 0.1 ELLIPTICAL, LSB DEC=+01D30'27.12" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 10 UDG-5B GALAXY, DWARF RA=12H06M30.0051S, J2000 V = 20.97 +/- 0.1 ELLIPTICAL, LSB DEC=+01D33'23.19" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15277( 2) - 06-Dec-2018 16:19:29 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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 ------------------------------------------------------------------------------------------------------------------------------------ 15277( 2) - 06-Dec-2018 16:19:29 - [ 4] Visit: 01 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 UDG-1A ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-1A ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-1A 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-1A 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-1A 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-1A 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 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 UDG-2A ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-2A ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-2A 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-2A 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-2A 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-2A 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 6] Visit: 03 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 UDG-3A ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-3A ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-3A 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-3A 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-3A 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-3A 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 7] Visit: 04 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 UDG-4A ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-4A ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-4A 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-4A 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-4A 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-4A 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 8] Visit: 05 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 UDG-5A ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-5A ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-5A 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-5A 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-5A 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-5A 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 9] Visit: 06 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 UDG-1B ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-1B ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-1B 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-1B 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-1B 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-1B 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 10] Visit: 07 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 UDG-2B ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-2B ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-2B 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-2B 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-2B 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-2B 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 11] Visit: 08 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 UDG-3B ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-3B ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-3B 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-3B 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-3B 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-3B 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 12] Visit: 09 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 UDG-4B ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-4B ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-4B 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-4B 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-4B 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-4B 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 13] Visit: 10 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 UDG-5B ACS/WFC ACCUM WFC1-FIX F814W 1 1200 S PATTERN 1 1 see below (2486 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 UDG-5B ACS/WFC ACCUM WFC1-FIX F606W 1 1200 S PATTERN 1 2 see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ UDG-5B 1 ACS/WFC ACCUM WFC1-FIX F814W 1 none none none 1 1243.0 S UDG-5B 1 ACS/WFC ACCUM WFC1-FIX F814W 2 none none none 1 1243.0 S UDG-5B 2 ACS/WFC ACCUM WFC1-FIX F606W 1 none none none 2 1312.0 S UDG-5B 2 ACS/WFC ACCUM WFC1-FIX F606W 2 none none none 2 1312.0 S 15277( 2) - 06-Dec-2018 16:19:29 - [ 14] Summary Form for Proposal 15277 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names UDG-1A, UDG-1B, UDG-2A, UDG-2B, UDG-3A, UDG-3B, UDG-4A, UDG-4B, UDG-5A, UDG-5B ------------------------------------------------------------------------------------------------------------------------------------