12763( 2) - 15-Sep-2011 12:17:26 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12763 Version: 2 Check-in Time: 15-Sep-2011 12:17:26 STScI Edit Number: 0 Title The Impact of Brightest Cluster Galaxy Formation on the Intracluster Medium ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. John S. Mulchaey Carnegie Institution of Washington CoI: Dr. Jesper Rasmussen Carnegie Institution of Washington N CoI: Dr. Tesla Jeltema University of California - Santa Cruz N CoI: Prof. Anthony H. Gonzalez University of Florida N CoI: Prof. Lori M. Lubin University of California - Davis N ------------------------------------------------------------------------------------ Abstract We propose Chandra and HST observations of a unique X-ray cluster in which the Brightest Cluster Galaxy (BCG) is in the late stages of formation. The Chandra observations will be used to study how the properties of the intracluster medium are impacted by BCG formation and the HST data will be used to map out the intracluster stellar light. We will test whether the formation of the BCG has destroyed the cool core and determine the role of intracluster stars in enriching the intracluster medium. The proposed observations will be combined with our existing Chandra and HST data for clusters where the BCG is in the early stages of formation, allowing us to develop a more complete evolutionary picture of how BCG formation has affected the intracluster medium. ------------------------------------------------------------------------------------ Observations Description ------------------------ The center of a cluster of galaxies at moderate redshift will be observed with WFC3/IR to map out the stellar light near the center of the cluster. We will observe the cluster in the F160W and F105W filters. The approximate exposure time is 4000 seconds for F160W and 8000 seconds for F105W. To achieve these exposure times we will observe the target using the WFC3-IR-DITHER-BOX-MIN dither pattern. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12763( 2) - 15-Sep-2011 12:17:26 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 RXJ0720.8+71 CLUSTER OF GALAXIES, RA=07H20M53.9834S +/- 0.1", J2000 V = 19.5 +/- 0.4 09 GROUP, HIGH REDSHIFT DEC=+71D08'57.00" +/- 0.1" CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12763( 2) - 15-Sep-2011 12:17:26 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 12763( 2) - 15-Sep-2011 12:17:26 - [ 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 RXJ0720.8+7 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=15 2 DEF PATTERN 1 1 109 CUM ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ0720.8+7 WFC3/IR MULTIAC IR F105W NSAMP=15, SAMP-SEQ=STEP50 4 DEF PATTERN 1 2 109 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 1 none 1 none 1 N/A CUM RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 1 none 2 none 1 N/A CUM RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 2 none 1 none 1 N/A CUM RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 2 none 2 none 1 N/A CUM RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 3 none 1 none 1 N/A CUM RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 3 none 2 none 1 N/A CUM RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 4 none 1 none 2 N/A CUM RXJ0720.8+7109 1 WFC3/IR MULTIAC IR F160W 4 none 2 none 2 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 1 none 1 none 2 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 1 none 2 none 2 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 1 none 3 none 2 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 1 none 4 none 2 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 2 none 1 none 3 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 2 none 2 none 3 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 2 none 3 none 3 N/A CUM 12763( 2) - 15-Sep-2011 12:17:26 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 2 none 4 none 3 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 3 none 1 none 3 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 3 none 2 none 3 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 3 none 3 none 4 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 3 none 4 none 4 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 4 none 1 none 4 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 4 none 2 none 4 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 4 none 3 none 4 N/A CUM RXJ0720.8+7109 2 WFC3/IR MULTIAC IR F105W 4 none 4 none 4 N/A CUM 12763( 2) - 15-Sep-2011 12:17:26 - [ 6] Summary Form for Proposal 12763 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=15, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names RXJ0720.8+7109 ------------------------------------------------------------------------------------------------------------------------------------