10820( 4) - 05/22/06 09:28 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10820 Version: 4 Check-in Time: 22-May-2006 13:27:56 STScI Edit Number: Title Galaxy properties in a Filament in Abell 851 ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Alan Dressler Carnegie Institution of Washington CoI: Dr. Augustus Oemler Jr. Carnegie Institution of Washington N ------------------------------------------------------------------------------------ Abstract We propose to image two fields that cover the filament of galaxies that is streaming into the remarkable cluster Abell 851, z=0.41, one of the two examples of the expected mechanism of cluster growth. These observations will test theories of alteration of galaxy morphology and star formation history for galaxies infalling into intermediate redshift clusters. ------------------------------------------------------------------------------------ Observations Description ------------------------ The observations are two adjoining, slightly overlapping, ACS WFC single-orbit F606W exposures of a filament of galaxies proceding out from the rich cluster A851 at z=0.41. The galaxies in the filament span a range of Rmag = 21-25. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10820( 4) - 05/22/06 09:28 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL0851F2 CLUSTER OF GALAXIES, RA=09H42M15.1461S +/- 0.1", J2000 V = 22.0 HIGH REDSHIFT CLUSTER DEC=+47D03'55.40" +/- 0.1" Reference Frame: ICRS 2 ABELL0851F1 CLUSTER OF GALAXIES, RA=09H42M34.4384S +/- 0.1", J2000 V = 22.0 HIGH REDSHIFT CLUSTER DEC=+47D03'8.41" +/- 0.1" Reference Frame: ICRS 10820( 4) - 05/22/06 09:28 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 3.011 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10820( 4) - 05/22/06 09:28 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 284.0D TO 286.0 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL0851F2 ACS/WFC ACCUM WFC F606W CR-SPLIT=NO 1 745 S PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFPC2 IMAGE WF2 F606W 1 600 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 | ------------------------------------------------------------------------------------------------------------------------------------ ABELL0851F2 1 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A ABELL0851F2 1 ACS/WFC ACCUM WFC F606W 2 none none none 1 N/A ABELL0851F2 1 ACS/WFC ACCUM WFC F606W 3 none none none 1 N/A ANY 2 WFPC2 IMAGE WF2 F606W 1 none none none 1 N/A ANY 2 WFPC2 IMAGE WF2 F606W 2 none none none 1 N/A ANY 2 WFPC2 IMAGE WF2 F606W 3 none none none 1 N/A 10820( 4) - 05/22/06 09:28 - [ 5] Visit: 02 Visit Priority: Visit Requirements: SAME ORIENT AS 01 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 ABELL0851F1 ACS/WFC ACCUM WFC F606W CR-SPLIT=NO 1 745 S PATTERN 1 1-2; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFPC2 IMAGE WF2 F606W 1 600 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 | ------------------------------------------------------------------------------------------------------------------------------------ ABELL0851F1 1 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A ABELL0851F1 1 ACS/WFC ACCUM WFC F606W 2 none none none 1 N/A ABELL0851F1 1 ACS/WFC ACCUM WFC F606W 3 none none none 1 N/A ANY 2 WFPC2 IMAGE WF2 F606W 1 none none none 1 N/A ANY 2 WFPC2 IMAGE WF2 F606W 2 none none none 1 N/A ANY 2 WFPC2 IMAGE WF2 F606W 3 none none none 1 N/A 10820( 4) - 05/22/06 09:28 - [ 6] Summary Form for Proposal 10820 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC WF2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 284.0D TO 286.0 D; PATTERN 1 1-2; PAR 2 WITH 1; SAME ORIENT AS 01; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ABELL0851F2 ANY ABELL0851F1 ------------------------------------------------------------------------------------------------------------------------------------