Mathematics – Logic
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9131e&link_type=abstract
HST Proposal ID #9131
Mathematics
Logic
Hst Proposal Id #9131 Cosmology
Scientific paper
We propose to complete our STIS snapshot survey of distant galaxies of known redshift which hosted supernovae {SNe} of Type Ia found via the Supernova Cosmology Project {SCP}. 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 per cent} confidence is now limited more by the possibility of systematic errors than statistical uncertainty. In particular, it is important to justify convincingly that environmental differences between low and high redshift SNe are accounted for by current lightcurve width-color-luminosity correction methods. Tackling systematic effects in the SCP dataset via detailed studies of the host galaxies is being undertaken both with this HST snapshot program {where the SNe Hubble diagram is being examined with respect to the host galaxy morphology and galacto-centric distance for each SN} and an associated spectroscopic campaign on the Keck telescope {which constrains the likely stellar populations and extinction variations at the SN site}. The first results from both aspects are encouraging and support the SCP's conclusions. However, only 33 of the 63 originally- requested snapshot images have been secured. We thus request the snapshot program be continued to completion in Cycle 10.
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