Assigned ID: 474 ----- Attempting Submission 1 (Fri Feb 24 16:49:59 GMT 2012) ----- ----- Attempting Submission 1 (Mon Jul 09 19:56:52 GMT 2012) ----- 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. WFC3 observations of the z~2 cluster CL J1449+0856 in the F105W (exposure time = 6562s) and F606W (995s) filters. COSMOLOGY 12 false 0.0 0.0 false false false false SUPPORTED CLUSTER OF GALAXIES HIGH REDSHIFT CLUSTER J2000 J2000 Targets down to Y~26.7 AB mag. 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) WFC3/IR Imaging No No F105W POS-TARG DITHER 0.572 LINE 0.365 false true 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false POS-TARG DITHER DITHER 4 6.09 WFC3-IR-DITHER-BOX-MIN true 74.653 true 0.365 0.572 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 18.528 7 true POS-TARG DITHER 6.82 LINE false true 2 46.84 WFC3-UVIS-DITHER-LINE 9 false 1341828524303 /Users/vstrazzu/OP-cache/phase2_12991-v01.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12991 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "09-Jul-2012 12:08:42.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 6088944 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12991 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12991 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 116 :internal-dur-at-end 699 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3233 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12991 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2936 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3233 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12991 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2936 :al-overhead-at-end 0 :internal-dur-at-end 652 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3233 :pcs-gap 0 ) true 3 0