11841( 3) - 20-Jan-2009 14:54:41 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11841 Version: 3 Check-in Time: 20-Jan-2009 14:54:41 STScI Edit Number: 0 Title The Formation of Brightest Cluster Galaxies ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. John S. Mulchaey Carnegie Institution of Washington CoI: Dr. Jesper rasmussen Carnegie Institution of Washington N CoI: Dr. Daisuke Kawata Carnegie Institution of Washington N CoI: Prof. Trevor J. Ponman University of Birmingham N CoI: Dr. Somak Raychaudhury University of Birmingham N ------------------------------------------------------------------------------------ Abstract We propose Chandra and HST observations of a unique low redshift cluster in which the Brightest Cluster Galaxy (BCG) is in the process of forming. The Chandra observations will be used to study the impact of BCG formation on the properties of the intracluster medium. We will test whether galaxy merging can destroy cool cores and disrupt hot gas halos. We will also explore the role of intracluster stars in enriching the intracluster medium. The HST observations will be used to search for extended tidal features and young star clusters and to estimate the final stellar mass of the BCG. The low redshift of our target allows a more detailed study of BCG formation than is possible with higher redshift systems. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use HST imaging of the core of MZ 10451 to search for extended tidal features and young star clusters that may have formed in the encounter. Our program will use the WFC3 UVIS channel. We will image the cluster center in two bands: F475W and F814W. The extended stellar plume is oriented along the north-south direction and we have specified a range of orientation angles to allow maximum spatial coverage of this feature. As we are also particularly interested in the region between the two nuclei, we will use a 4-point mosaic pattern that will allow us to avoid the chip gap in this vital region. Real Time Justification ----------------------- Calibration Justification ------------------------- No special calibration required. Additional Comments ------------------- ------------------------------------------------------------------------------------ 11841( 3) - 20-Jan-2009 14:54:41 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 MZ10451 CLUSTER OF GALAXIES, RA=02H29M44.8000S +/- 0.1", J2000 V = V = 16.7 +/- 0.1 TIDAL TAIL, POOR DEC=-29D38'2.80" +/- 0.1" 18225 CLUSTER, MULTIPLE NUCLEI, INTERACTING GALAXY, GALAXY PAIR Reference Frame: Other: GSC2 Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 0.0 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 11841( 3) - 20-Jan-2009 14:54:41 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-MOS-BOX-LRG Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 5.4 Line_Spacing 77.5 Coordinate_Frame POS-TARG Pattern_Orient 5.55 Angle_Between_Sides 95.3 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 11841( 3) - 20-Jan-2009 14:54:41 - [ 4] Visit: 01 Visit Requirements: ORIENT 15D TO 75 D; ORIENT 195D TO 255 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 MZ10451 WFC3/UVI ACCUM UVIS F475W CR-SPLIT=NO 1 635 S PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ MZ10451 1 WFC3/UVI ACCUM UVIS F475W 1 none none none 1 N/A S MZ10451 1 WFC3/UVI ACCUM UVIS F475W 2 none none none 1 N/A S MZ10451 1 WFC3/UVI ACCUM UVIS F475W 3 none none none 1 N/A S MZ10451 1 WFC3/UVI ACCUM UVIS F475W 4 none none none 1 N/A S 11841( 3) - 20-Jan-2009 14:54:41 - [ 5] Visit: 02 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 MZ10451 WFC3/UVI ACCUM UVIS F814W CR-SPLIT=NO 1 635 S PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ MZ10451 1 WFC3/UVI ACCUM UVIS F814W 1 none none none 1 N/A S MZ10451 1 WFC3/UVI ACCUM UVIS F814W 2 none none none 1 N/A S MZ10451 1 WFC3/UVI ACCUM UVIS F814W 3 none none none 1 N/A S MZ10451 1 WFC3/UVI ACCUM UVIS F814W 4 none none none 1 N/A S 11841( 3) - 20-Jan-2009 14:54:41 - [ 6] Summary Form for Proposal 11841 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 15D TO 75 D, ORIENT 195D TO 255 D, PATTERN 1 1, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F475W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names MZ10451 ------------------------------------------------------------------------------------------------------------------------------------