The Distant Type Ia Supernova Rate

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© 2002. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation R. Pain et al 2002 ApJ 577 120 DOI 10.1086/342129

0004-637X/577/1/120

Abstract

We present a measurement of the rate of distant Type Ia supernovae derived using four large subsets of data from the Supernova Cosmology Project. Within this fiducial sample, which surveyed about 12 deg2, 38 supernovae were detected at redshifts 0.25-0.85. In a spatially flat cosmological model consistent with the results obtained by the Supernova Cosmology Project, we derive a rest-frame Type Ia supernova rate at a mean redshift z ≃ 0.55 of 1.53 × 10-4 h3 Mpc-3 yr-1 or 0.58 h2 SNu (1 SNu = 1 supernova per century per 1010 LB), where the first uncertainty is statistical and the second includes systematic effects. The dependence of the rate on the assumed cosmological parameters is studied and the redshift dependence of the rate per unit comoving volume is contrasted with local estimates in the context of possible cosmic star formation histories and progenitor models.

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10.1086/342129