Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.7588s&link_type=abstract
HST Proposal ID #7588
Physics
Hst Proposal Id #7588 Cosmology
Scientific paper
This cycle 6 DD program is the first step in a program that will be pursued in Cycle 7 and beyond to use HST to obtain photometry of 35 distant SNe Ia at redshifts 0.45 < z < 1.0, producing a precise Hubble diagram from which we can measure cosmic deceleration and global curvature of the universe. Our team has gathered a large sample of nearby SNe Ia and has demonstrated that SNe Ia can provide accurate relative distances to objects at these redshifts, free of systematic effects caused by reddening, Malmquist bias, K-corrections, and evolution. HST can make an essential contribution by providing photometry with substantially higher precision and better temporal coverage than can be obtained from the ground. Our group has independently developed methods for the rapid identification of high redshift supernova candidates at z ~ 0.5, discovering 20 high-z objects in the past year, and will be instituting even higher redshift searches in the coming year. We follow up our discoveries within 48 hours with photometry and spectroscopy to classify the objects and measure their redshifts, enabling us to quickly select suitable HST targets. Simulations demonstrate that for maximum efficiency we should observe each SN at 6 epochs during the 43 days following maximum light, and then obtain an image of the host galaxies after the SN has faded for accurate galaxy subtraction. This observing program will allow us to measure q_0 to better than Sigma = 0.1, and enable us to separate the effects of curvature and deceleration.
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