From: Lori Lubin (lubin@physics.ucdavis.edu)
Date: Fri Oct 28 2005 - 15:24:47 PDT
Hi Kyle, Mike, and Henk,
Sorry for the late response, but I have been in meetings for two days
(almost) straight. The background cluster is very close to CL1604+4321
(less than a few arcmin). Because of the sparse selection due to the
large field of the DEIMOS mask, it is difficult to get an accurate
centroid for the background cluster. The confirmed members are spread
around quite a bit. If we placed the ACS pointing near (or on)
CL1604+4321, we would get around 5 confirmed galaxies at z = 1.17 and on
the order of 30-40 confirmed galaxies at z = 0.92. We have much better
coverage of CL1604+4321 as you can see.
I was not thinking about the weak lensing analysis when I suggested the
target. However, you could, perhaps, get a good measurement for
CL1604+4321 at z = 0.92 in any case.
Regards,
Lori
On Wed, 26 Oct 2005, Kyle S Dawson wrote:
> Is the z=1.2 cluster close enough to the foreground cluster cl1604+4321 to fit them both in the FOV of ACS?
> How many foreground galaxies associated with the supercluster would fall into the 3' FOV if the ACS were
> centered on the z=1.2 cluster? I believe the effects due to lensing are not that significant, on the order of a few
> percent, and those negative effects would be outweighted by the high density of galaxies in the projection
> along the line of sight of two clusters.
> -Kyle
>
>
> ----- Original Message -----
> From: Lori Lubin <lubin@physics.ucdavis.edu>
> Date: Wednesday, October 26, 2005 5:23 pm
> Subject: Possible z > 1 target cluster
>
> >
> > As part of our DEIMOS survey of the CL1604 supercluster at z = 0.9 (of
> > which one of our SN targets CL1604+4304 at z = 0.90 is a member), we
> > discovered a background cluster at z = 1.17. We have 37 confirmed
> > members,with a velocity dispersion of ~850 km/s. This cluster is
> > located near
> > another SC member, CL1604+4321 at z = 0.92. It may be an interesting
> > target because of the existing number of redshifts and the
> > possibility of
> > getting SN at z = 0.9 at the same time, although the lensing due to
> > theintervening structure may make this target too complicated.
> >
> > Regards,
> >
> > Lori
> >
> >
> >
>
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