12991( 2) - 10-Jul-2012 23:45:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12991 Version: 2 Check-in Time: 10-Jul-2012 23:45:16 STScI Edit Number: 0 Title Red galaxies in CL J1449+0856 at z=2.07: the red sequence in the most distant galaxy cluster ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Veronica Strazzullo CEA/DSM/DAPNIA/Service d'Astrophysique Y CoI: Dr. Emanuele Daddi Commissariat a l'Energie Atomique (CEA) N CoI: Dr. Raphael Gobat CEA/DSM/DAPNIA/Service d'Astrophysique N CoI: Dr. Masato Onodera Eidgenossiche Technische Hochschule (ETH) N CoI: Prof. C. Marcella Carollo Eidgenossiche Technische Hochschule (ETH) N CoI: Prof. Alvio Renzini Osservatorio Astronomico di Padova N CoI: Dr. Mark Dickinson National Optical Astronomy Observatory, N AURA CoI: Dr. Alexis Finoguenov Max-Planck-Institut fur extraterrestrische N Physik CoI: Dr. Andrea Cimatti Universita di Bologna N CoI: Prof. Nobuo Arimoto National Astronomical Observatory of Japan N (NAOJ) ------------------------------------------------------------------------------------ Abstract We propose to obtain WFC3 NIR imaging in the F105W band in the field of the cluster CL J1449+0856 at z=2.07. This is the most distant X-ray detected cluster known thus far, the most evolved system discovered at a redshift very close to the expected main formation epoch of massive cluster galaxies. The core of this cluster is populated by red galaxies, several of which already exhibit an early-type morphology. At the same time, other red galaxies have disk-like structures, some are involved in mergers or interactions, some are suspected to be dusty star-forming sources. Given the importance of the red-sequence population in galaxy clusters over more than half of cosmic time, it is clear how critical is the investigation of these sources in this unique system so close to their expected formation. In spite of an extensive multi-wavelength data set, the faintness and red colors of our targets make it impossible to study the red sequence in detail with ground-based imaging blueward of the targets 4000A break. The proposed observations, coupled with the already available WFC3 imaging in the F140W band, and deep Subaru imaging in the Ks band, will allow a detailed analysis of the actual nature of red galaxies in this structure, and push for the first time beyond redshift 2 the study of the evolution of the red sequence in galaxy clusters. ------------------------------------------------------------------------------------ Observations Description ------------------------ WFC3 observations of the z~2 cluster CL J1449+0856 in the F105W (exposure time = 6562s) and F606W (995s) filters. Real Time Justification ----------------------- 12991( 2) - 10-Jul-2012 23:45:16 - [ 2] Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12991( 2) - 10-Jul-2012 23:45:16 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CLJ1449+0856 CLUSTER OF GALAXIES, RA=14H49M15.1000S +/- 0.1", J2000 Targets down to Y~26.7 AB mag. HIGH REDSHIFT CLUSTER DEC=+08D56'8.40" +/- 0.1" Brightest star in the field (RA=10:49:10 , Dec=08:56:51) has J=11.4, J-K=0.5 (from 2MASS, Vega), and V=12.6 (B-V=0.6) Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12991( 2) - 10-Jul-2012 23:45:16 - [ 4] 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 7 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER DITHER Number_Of_Points 2 4 Point_Spacing 6.09 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 18.528 Angle_Between_Sides 74.653 Center_Pattern YES YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 9 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 6.82 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 12991( 2) - 10-Jul-2012 23:45:16 - [ 5] 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 CLJ1449+085 WFC3/IR MULTIAC IR-FIX F105W SAMP-SEQ=SPARS25, NSAMP=14 1 DEF PATTERN 1 1 6 CUM ------------------------------------------------------------------------------------------------------------------------------------ 2 CLJ1449+085 WFC3/UVI ACCUM UVIS-IR-F F606W 1 350 S PATTERN 9 2 6 S IX ------------------------------------------------------------------------------------------------------------------------------------ 3 CLJ1449+085 WFC3/UVI ACCUM UVIS-IR-F F606W 1 295 S 6 S IX ------------------------------------------------------------------------------------------------------------------------------------ 4 CLJ1449+085 WFC3/IR MULTIAC IR-FIX F105W SAMP-SEQ=SPARS25, NSAMP=14 2 DEF PATTERN 7 4 6 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 | ------------------------------------------------------------------------------------------------------------------------------------ CLJ1449+0856 1 WFC3/IR MULTIAC IR-FIX F105W 1 none none none 1 N/A CUM CLJ1449+0856 1 WFC3/IR MULTIAC IR-FIX F105W 2 none none none 1 N/A CUM CLJ1449+0856 1 WFC3/IR MULTIAC IR-FIX F105W 3 none none none 1 N/A CUM CLJ1449+0856 1 WFC3/IR MULTIAC IR-FIX F105W 4 none none none 1 N/A CUM CLJ1449+0856 2 WFC3/UVI ACCUM UVIS-IR- F606W 1 none none none 1 N/A S FIX CLJ1449+0856 2 WFC3/UVI ACCUM UVIS-IR- F606W 2 none none none 1 N/A S FIX CLJ1449+0856 3 WFC3/UVI ACCUM UVIS-IR- F606W none none none none 1 N/A S FIX CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 1 1 none 2 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 1 2 none 2 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 2 1 none 2 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 2 2 none 2 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 3 1 none 2 N/A CUM 12991( 2) - 10-Jul-2012 23:45:16 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 3 2 none 2 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 4 1 none 2 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 1 4 2 none 2 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 1 1 none 3 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 1 2 none 3 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 2 1 none 3 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 2 2 none 3 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 3 1 none 3 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 3 2 none 3 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 4 1 none 3 N/A CUM CLJ1449+0856 4 WFC3/IR MULTIAC IR-FIX F105W 2 4 2 none 3 N/A CUM 12991( 2) - 10-Jul-2012 23:45:16 - [ 7] Summary Form for Proposal 12991 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, UVIS-IR-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 7 4, PATTERN 9 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names CLJ1449+0856 ------------------------------------------------------------------------------------------------------------------------------------