From: Tony Spadafora (ALSpadafora@lbl.gov)
Date: Thu Apr 14 2005 - 10:34:02 PDT
From: Lori Lubin <lubin@physics.ucdavis.edu>
Date: April 13, 2005 8:40:54 PM PDT
To: saul@lbl.gov
Cc: Lori Lubin <lubin@physics.ucdavis.edu>
Subject: Status on the CL1604 Supercluster Field
Hi Saul and the HST Cluster SN team,
Here is the status of the CL1604 Supercluster Field.
One pointing in the CL1604 supercluster at z = 0.9 was included in the
target list. We currently have 60+ confirmed-cluster redshifts each in
four of the eight clusters in this system (600+ redshifts total). The
spectroscopy of the remaining four clusters will be taken on May 7-9,
2005 during a Keck run with DEIMOS. We expect to get 40+
confirmed-cluster redshifts in each cluster. The spectroscopic survey
should have about 900 redshifts across the field after this run. All
eight clusters have r'i'z' imaging (magnitude limit of z' = 23.5)
taken at the Palomar 200-in. Currently, the most likely target is
CL1604+4304 at z = 0.9001. It is the richest member cluster so far,
with a velocity dispersion of 962 km/s. There also exists ACS F606W
and F814W images from the GTO team (now publically available). Either
the ground-based z' or ACS F814W image can be used to screen for SN
initially. We are classifying the galaxies in the ACS images and are
currently writing a paper on the morphological properties of the
confirmed cluster members. (The GTO team also has their own galaxy
classifications in this field). This target will be observed later in
the cycle, so, if any of the four new clusters appears significantly
richer (with more ellipticals) than CL1604+4304, we may want to make a
substitution later.
Cheers,
Lori
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