Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724909s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #249.09; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We report the results from the HST Cluster Supernova Survey (PI: Perlmutter; see Dawson et al. AJ, 2009). This survey introduced a novel approach to efficiently discover SNe Ia at very high redshift while controlling for host galaxy environment and dust extinction. By monitoring 25 high redshift massive clusters with the Advanced Camera for Surveys (ACS), a total of 20 SNe Ia were discovered, including nine SNe in z > 0.9 galaxy clusters and eight z > 0.9 SNe Ia in the field, nearly doubling the existing high redshift SNIa sample. (For a discussion of the rates, see K. Barbary, dissertation talk at this meeting). We propagate statistical and systematic errors from supernova measurements (see Rubin et al. poster presentation) to the combined cosmological analysis with CMB and BAO observations. Recent observations show that supernova properties may depend on the host galaxy environment. Galaxy clusters provide us with very well constrained host galaxy environments and are well-suited for testing host galaxy effects on the SNe Ia properties. We present such studies and the best cosmological parameter measurements from this survey. This work has been supported by the Office of Science, U.S. Department of Energy, through contract DE-AC02-05CH11231 and in part by NASA through grants associated with HST-GO-10496.
Aldering Greg
Amanullah Rahman
Barbary Kyle
Barrientos L.
Brodwin Mark
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