From: Kyle Dawson (kdawson@lbl.gov)
Date: Thu Jan 26 2006 - 18:12:25 PST
Our Cycle 14 program has now proven a new extremely efficient approach
to obtain z>1 dust-free Type Ia supernovae, and we here propose to
capitalize on this new technique . We will collect a total sample of
~20 z>1 SNe Ia in cluster ellipticals, yielding dark energy measurements
that do not suffer from the major systematic uncertainty at these
redshifts, that of the extinction correction with a prior. By targeting
massive galaxy clusters at z>1, we obtain a five-times [CHECK] higher
efficiency in detection of Type Ia supernovae in elliptical galaxies,
and provide a well-understood host galaxy environment. These same deep
cluster images then also yield fundamental calibrations required for
future weak lensing and Sunyaev-Zel'dovich measurements of dark energy,
as well as an entire program of cluster studies. The data will make
possible a factor of two improvement on supernova constraints on dark
energy dynamics, and much larger improvement in systematic uncertainty,
taking advantage of the uniquely well-controlled host environment that
clusters provide. They will provide both a cluster dataset and a SN Ia
data set that will be a longstanding scientific resource.
We have a limit of 20 lines at 72 characters per line, right now, we are
at 17 lines.
Comments from Marc:
0. "and we propose here to (continue to??) capitalize on ..."
1. Do you want to note the higher weighting of 1 dust-free elliptical = 9 field SNe somewhere?
2. If you are refering to the overdensity of z>1 ellipticals, then I would say the factor is AT LEAST 5x and can be as high as 10 - 15x.
My question:
What have we decided about overdensity of z>1 ellipticals? Is that at
the cluster center or averaged across the ACS FOV?
-Kyle
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