Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8313e&link_type=abstract
HST Proposal ID #8313
Mathematics
Logic
Hst Proposal Id #8313 Clusters Of Galaxies And Lensing
Scientific paper
We propose to obtain snapshot unfiltered STIS images of distant galaxies of known redshift which have hosted supernovae {SNe} of Type Ia found via the Supernova Cosmology Project. The Hubble diagram of these SNe yields measurements of the cosmological parameters {Omega, Lambda} that are inconsistent with a flat Universe of zero cosmological constant. Even if the universe is not flat, Lambda > 0 is indicated with strong statistical confidence > 99 this confidence is now limited more by the possibility of systematic errors than by statistical uncertainty. In particular, it is important to justify convincingly that effects of the environments of low and high redshift SNe are accounted for by current lightcurve width-color-luminosity correction methods. HST will secure high resolution images to test this hypothesis. We will look for correlations between the luminosity or lightcurve width of the SNe and the host galaxy morphologies and positions of SNe with respect to their host galaxies. We will identify a subset of SNe that are far from the host galaxy, and thus likely to be un-extincted, and use them to obtain an independent check on the effect of extinction on the cosmological parameter measurements. Host galaxy morphologies will also provide new constraints on possible evolution of the SN Ia rate as a function of redshift and galaxy type which can be compared to predictions based on global star formation histories.
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