latest abstract

From: Kyle Dawson (kdawson@lbl.gov)
Date: Fri Jan 27 2006 - 13:23:15 PST

  • Next message: Kyle Dawson: "small correction to abstract"

    Our Cycle 14 program has now proved 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, each of which will carry the weight
    of 9 color-corrected z>1 SNe hosted by spiral galaxies, and 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 more than
    five-times 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
    mass calibrations required for ongoing and future studies which aim to
    measure dark energy via the evolution of cluster abundances, 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
    evolution 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.



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