From: Marc Postman (postman@stsci.edu)
Date: Thu Jan 26 2006 - 13:34:42 PST
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.
___________________________________________________________________________
Marc Postman E-mail: postman@stsci.edu
Space Telescope Science Institute Phone: +1-410-338-4340
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---- Original message ----
>Date: Thu, 26 Jan 2006 13:10:09 -0800
>From: Saul Perlmutter <saul@lbl.gov>
>Subject: Next version of abstract -- probably needs more work.
>To: Kyle Dawson <KDawson@lbl.gov>
>Cc: hstclustersn@lbl.gov
>
>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 time variation, 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.
>
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