This is a simple program to take deep 7 orbit F160W imaging of a single field.
Two visits are envisaged (3+4 orbits). No constraints have been placed.----- Attempting Submission 1 (Fri Apr 20 14:47:53 GMT 2007) -----
Assigned ID: 235
----- Attempting Submission 1 (Fri Jan 26 13:47:40 GMT 2007) -----
Phase I Proposal 235 (Cy16_z2clust) successfully submitted.
----- Attempting Submission 3 (Fri Jan 26 13:58:42 GMT 2007) -----
Phase I Proposal 235 (Cy16_z2clust) successfully submitted.
----- Attempting Submission 4 (Fri Jan 26 16:32:10 GMT 2007) -----
A Spitzer/X-ray candidate cluster at z>2: NICMOS imagingWe propose deep H-band imaging with NICMOS of a remarkable z>2 cluster of galaxy candidate. Over a 1000 arcmin^2 field imaged with Spitzer's IRAC and MIPS we have discovered a compact (<30'' diameter) concentration of extremely red galaxies with a factor of >40 overdensity over the adjacent field. Among these galaxies for which we can derive meaningful photometric redshifts, 17 are consistent with zphot=2-2.5, making very likely that the concentrationis is a real cluster at such high redshift. This is further supported by a 3.5 sigma detection of extended X-Ray emission on Newton-XMM data, by a likely color-magnitude sequence of red galaxies, and by the presence of a giant galaxy consistent with a BCG at the cluster redshift. While spectroscopic confirmation of the cluster might result prohibitive with current facilities, HST high resolution imaging will allow us to gain crucial information for the study and scientific exploitation of this hot gas hosting, record high-z cluster of galaxies. The HST high resolution observations will allow us to unveil the rest frame optical morphologies of the galaxies and confirm the presence of ellipticals in the structure, detect and characterize the color-magnitude relation, measure their effective radii and construct their Kormendy relation for the passively evolving subsample, improve the photometric redshift estimates to confirm the real cluster nature of the structure, estimate stellar masses and check for possible deviations from the local mass-size relation, search for mergers and AGNs, and establish a cluster benchmark for cluster-field comparisons at this highest redshift.Our goal is to obtain high resolution and high S/N imaging of the $z>2$ cluster member
candidates in the structure. Given the extremely red SEDs of the sources, the most
efficient mean by far is observing in the near-IR with NICMOS in the F160W band.
This also allows to obtain data at optical rest-frame wavelengths (between B and V
bands rest frame for $z\sim2$--2.5).
The angular size of the galaxy overdensity is about 30$''$, which can be easily covered
with a single pointing with the NICMOS3 camera. With a FWHM of about 0.2$''$, corresponding to
about 1.7 kpc (proper size) at $z=2$--2.5, this will suffice to distinguish disks
and irregular (i.e. dusty or merging) galaxies from spheroids and to constrain sizes to a limit
of $\simlt1$ kpc. This size limit is comparable to the size of the smallest field $z>1.4$
passive ellipticals (Daddi et al. 2005).
The IRAC brightest galaxy in the structure (candidate BCG) has $H=22.2$ AB, derived
from the best fit SED (Fig.~\ref{fig:x}). The cluster member candidates are up to 3.5 magnitudes fainter in IRAC than the BCG
(see Fig~\ref{fig:1}). Conservatively assuming they are as red as the BCG in $(H-m_{3.6\mu m})$
color, we need to reach
$H=25$ AB in order to secure high quality imaging of most cluster members (14/17 to this limit).
We have used the NICMOS exposure time calculator for estimating the required integration
time to reach $S/N>10$ detection of a $H=25$ source. We consider a 1$''$ diameter aperture
and assume that at least 70\% of the flux falls withis the aperture. We consider 2 sub exposures
of 1300s per orbit (52 minutes visibility).
We find that in total 7 orbits are necessary to reach the required S/N ratio.
We will split the observations in a 4-orbit visit plus a 3-orbit visit. Each visit will perform a NIC-SPIRAL-DITH pattern with 2" (10 pixel) spacing (plus 1/2 pixel or 1/3 pixel extra shift for PSF sampling).COSMOLOGY12false0.0falsefalsefalsefalsefalsefalseSUPPORTEDCLUSTER OF GALAXIESHIGH REDSHIFT CLUSTERThe 30" diameter area of interest contain 10--20 targets with faint IR magnitudes, between AB 23 and 26J=23 AB brightest sourcesJ200014 49 14.4000+08 56 21.40J2000NIC3ImagingNoNoF160WPOS-TARGDITHERDITHER2.06666NIC-XSTRIP-DITHfalsefalse80POS-TARGNIC-SPIRAL-DITH01falsePOS-TARGDITHERDITHER2.1NIC-XSTRIP-DITHfalsefalse60POS-TARGNIC-SPIRAL-DITH02false/tmp/OPVisit43872.xml
(Tic-Visit
:proposal-id 11174
:visit-id "01"
:proposal-version -1
:trans-version "20070325"
:date "20-Apr-2007 16:44:02.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "23"
:si-bright-earth-limb-angle 20.0
:data-volume 203184
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11174
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11174
:visit-id "01"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2656
: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 3132
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11174
:visit-id "01"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2654
: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 3132
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11174
:visit-id "01"
:orbit-number 3
:pcs-time 355
:si-vis-utilization 2654
: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 3132
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11174
:visit-id "01"
:orbit-number 4
:pcs-time 355
:si-vis-utilization 2632
:al-overhead-at-end 0
:internal-dur-at-end 46
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3132
:pcs-gap 0
)
true40/dsm/sappcdaddi/local/home/edaddi/usbdisk/data1/ESO/home/proposals/hst/Cycle16/OP-cache/Cluster_PhaseII-v02.xml
(Tic-Visit
:proposal-id 11174
:visit-id "02"
:proposal-version -1
:trans-version "20070325"
:date "20-Apr-2007 16:44:05.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "23"
:si-bright-earth-limb-angle 20.0
:data-volume 152384
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11174
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11174
:visit-id "02"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2656
: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 3132
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11174
:visit-id "02"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2654
: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 3132
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11174
:visit-id "02"
:orbit-number 3
:pcs-time 355
:si-vis-utilization 2632
:al-overhead-at-end 0
:internal-dur-at-end 99
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3132
:pcs-gap 0
)
true30/tmp/OPVisit43841.xml