10994( 2) - 05/18/06 13:40 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10994 Version: 2 Check-in Time: 18-May-2006 17:39:37 STScI Edit Number: Title Infalling Groups and the Origin of Early-Type Galaxies ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GTO/ACS 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Holland Ford The Johns Hopkins University CoI: Dr. Bradford Holden University of California - Santa Cruz Y CoI: Prof. Garth D. Illingworth University of California - Santa Cruz N ------------------------------------------------------------------------------------ Abstract The creation of the cluster early-type galaxy sequence most likely occurs in groups, as mergers are possible in such environments. Recent results have shown that groups of galaxies at half of the Hubble time show a truncated red-sequence. We are surveying two small groups that will fall into a massive cluster by z=0, to determine the morphologies of the group members. The truncation of the red sequence should show up in the morphology-density relation and in an increased merger fraction. ------------------------------------------------------------------------------------ Observations Description ------------------------ Based on photometric and spectroscopic redshifts, two groups that will become part of a massive cluster of gaalxies have been identified. ACS imaging with two filters will be used to examine the morphologies, colors and mass-to-light ratios of group members. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10994( 2) - 05/18/06 13:40 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS- CLUSTER OF GALAXIES, RA=10H57M57.5020S +/- 0.1", J2000 V = 22.0+/-0.2 105757- GROUP, HIGH REDSHIFT DEC=-03D32'14.03" +/- 0.1" 033214 CLUSTER Reference Frame: ICRS 2 GAL-CLUS- CLUSTER OF GALAXIES, RA=10H57M27.2500S +/- 0.1", J2000 V = 22.0+/-0.2 105727- GROUP, HIGH REDSHIFT DEC=-03D28'59.70" +/- 0.1" 032859 CLUSTER Reference Frame: ICRS 10994( 2) - 05/18/06 13:40 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 3.11 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10994( 2) - 05/18/06 13:40 - [ 4] Visit: 01 Visit Priority: Visit Requirements: SCHED 70%; ORIENT 289.5D TO 290.5 D; BEFORE 15-DEC-2006:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS-10 ACS/WFC ACCUM WFC F606W GAIN=2,CR-SPLIT=NO 1 100 S PATTERN 1 1 5757-033214 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAL-CLUS-105757-03 1 ACS/WFC ACCUM WFC F606W 1 none none none 1 745.0 S 3214 GAL-CLUS-105757-03 1 ACS/WFC ACCUM WFC F606W 2 none none none 1 745.0 S 3214 GAL-CLUS-105757-03 1 ACS/WFC ACCUM WFC F606W 3 none none none 1 745.0 S 3214 10994( 2) - 05/18/06 13:40 - [ 5] Visit: 02 Visit Priority: Visit Requirements: SCHED 70%; SAME ORIENT AS 01; BEFORE 15-DEC-2006:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS-10 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=NO 1 100 S PATTERN 1 1 5757-033214 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAL-CLUS-105757-03 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 745.0 S 3214 GAL-CLUS-105757-03 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 745.0 S 3214 GAL-CLUS-105757-03 1 ACS/WFC ACCUM WFC F814W 3 none none none 1 745.0 S 3214 10994( 2) - 05/18/06 13:40 - [ 6] Visit: 03 Visit Priority: Visit Requirements: SCHED 70%; SAME ORIENT AS 01; BEFORE 15-DEC-2006:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS-10 ACS/WFC ACCUM WFC F606W GAIN=2,CR-SPLIT=NO 1 100 S PATTERN 1 1 5727-032859 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAL-CLUS-105727-03 1 ACS/WFC ACCUM WFC F606W 1 none none none 1 745.0 S 2859 GAL-CLUS-105727-03 1 ACS/WFC ACCUM WFC F606W 2 none none none 1 745.0 S 2859 GAL-CLUS-105727-03 1 ACS/WFC ACCUM WFC F606W 3 none none none 1 745.0 S 2859 10994( 2) - 05/18/06 13:40 - [ 7] Visit: 04 Visit Priority: Visit Requirements: SCHED 70%; SAME ORIENT AS 01; BEFORE 15-DEC-2006:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS-10 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=NO 1 100 S PATTERN 1 1 5727-032859 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GAL-CLUS-105727-03 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 745.0 S 2859 GAL-CLUS-105727-03 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 745.0 S 2859 GAL-CLUS-105727-03 1 ACS/WFC ACCUM WFC F814W 3 none none none 1 745.0 S 2859 10994( 2) - 05/18/06 13:40 - [ 8] Summary Form for Proposal 10994 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters GAIN=2 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 70%; ORIENT 289.5D TO 290.5 D; BEFORE 15-DEC-2006 00 00 00; PATTERN 1 1; SAME ORIENT AS 01; BEFORE 15-DEC-2006 00 00 00; BEFORE 15-DEC-2006 00 00 00; BEFORE 15-DEC-2006 00 00 00; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GAL-CLUS-105757-033214 GAL-CLUS-105727-032859 ------------------------------------------------------------------------------------------------------------------------------------