current draft of abstract

From: Kyle Dawson (kdawson@lbl.gov)
Date: Thu Jan 26 2006 - 18:12:25 PST

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    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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