From: Megan Donahue (donahue@pa.msu.edu)
Date: Wed Oct 19 2005 - 14:08:34 PDT
I apologize for missing the telecon -- I had speaker hosting duties for
lunchtime (the time of the telecon in Michigan.)
MS1054-03 is one of my personal favorites... :)
It's extremely rich.
Here's an update on my cluster search:
I've been looking at high-z (z>1) X-ray cluster candidates that were
not detected with I-band matched filter analysis with J and K
4-meter imaging and I've been a little
disappointed in the cluster richness, even in the clusters which have
galaxies
with the right colors with best chance of being the real deal. These are
cluster candidates which are at the faint end of Piero's RDCS clusters,
so
they're expected to be at the lower end of cluster mass and richness.
I'd have at most one candidate for this project (but only if we confirm
the redshift!)
but I think MS1054-03 would be more fruitful (in terms of SNe numbers
and science...)
- Megan
On Oct 19, 2005, at 4:01 PM, Kyle Dawson wrote:
> I just want to send out the reminder that we do need 2 clusters to
> fill the extra orbits left open due to guide star constraints and
> other scheduling considerations. In looking more closely, I see that
> we currently have 14 free orbits, and I do expect a few more to open
> up in the course of the next few months. Targets with an RA of
> 09:00-10:00 are just rising now for HST observations, depending on
> DEC. As a general rule of thumb, targets become visible from HST
> about a month or two before they become visible from the ground, where
> ground visibility is defined as 3 hr at less than 2 airmass.
> My personal favorite for a substitute cluster is still the
> controversial and well studied MS1054. At least 8 of its members are
> radio sources, 17% of its members are in the process of a merger, more
> than 80 members are spectroscopically confirmed and typed, already has
> I' and z' reference images from ACS, and is extremeley rich and
> massive. It also has deep X-ray images and deep SZ images along with
> a SN from one of our searched several years ago, if we get another SN
> in this cluster we can combine the multiple measurements and write up
> a result for a fairly well measured distance to a specific object and
> compare methods, which I don't believe has really been done before at
> such high z.
>
> -Kyle
This archive was generated by hypermail 2.1.4 : Wed Oct 19 2005 - 14:07:18 PDT