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20 April 2024

» arxiv » astro-ph/9505023

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A Supernova at z = 0.458 and Implications for Measuring the Cosmological Deceleration
S. Perlmutter ; C. R. Pennypacker ; G. Goldhaber ; A. Goobar ; R. A. Muller ; H. J. M. Newberg ; J. Desai ; A. G. Kim ; M. Y. Kim ; I. A. Small ; B. J. Boyle ; C. S. Crawford ; R. G. McMahon ; P. S. Bunclark ; D. Carter ; M. J. Irwin ; R. J. Terlevich ; R. S. Ellis ; K. Glazebrook ; W. J. Couch ; J. R. Mould ; T. A. Small ; R. G. Abraham ;
Date:	5 May 1995
Journal:	Astrophys.J. 440 (1995) L41
Subject:	astro-ph
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.
Source:	arXiv, astro-ph/9505023
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