A Supernova at z = 0.458 and Implications for Measuring the Cosmological Deceleration

Abstract

We have begun a program to discover high-redshift supernovae ($z\approx$ 0.25--0.5), and study them with follow-up photometry and spectroscopy. We report here our first discovery, a supernova at $z=0.458$. The photometry for this supernova closely matches the lightcurve calculated for this redshift from the template of well-observed nearby Type Ia supernovae. We discuss the measurement of the deceleration parameter $q_0$ using such high-redshift supernovae, and give the best fit value assuming this one supernova is a normal, unextincted Type Ia. We describe the main sources of error in such a measurement of $q_0$, and ways to reduce these errors.

Latex using aasms.sty and three postcript files uuencoded compressed. Ap.J.Lett., 440:L41, 1995 (posted for easy access). Complete postscript version also available at http://www-supernova.lbl.gov/public/index.html

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