Horesh, A. and Poznanski, D. and Ofek, E. O. and Maoz, D. (2008) The rate of Type Ia supernovae at z ≈ 0.2 from SDSS-I overlapping fields. Monthly Notices of the Royal Astronomical Society, 389 (4). pp. 1871-1880. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:HORmnras08
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In the course of the Sloan Digital Sky Survey (SDSS-I), a large fraction of the surveyed area was observed more than once due to field tiling overlap, usually at different epochs. We utilize some of these data to perform a supernova (SN) survey at a mean redshift of z= 0.2. Our archival search, in ∼5 per cent of the SDSS-I overlap area, produces 29 SN candidates clearly associated with host galaxies. Using the Bayesian photometric classification algorithm of Poznanski et al., and correcting for classification bias, we find 17 of the 29 candidates are likely Type Ia SNe. Accounting for the detection efficiency of the survey and for host extinction, this implies a Type Ia SN rate of rIa= (14.0+2.5+1.4−2.5−1.1± 2.5) × 10^−14 h270 yr^−1 L⊙^−1,g , where the errors are Poisson error, systematic detection efficiency error and systematic classification error, respectively. The volumetric rate is RIa= (1.89+0.42+0.18−0.34−0.15± 0.42) × 10^−5 yr^−1 h370 Mpc^−3 . Our measurement is consistent with other rate measurements at low redshift. An order of magnitude increase in the number of SNe is possible by analysing the full SDSS-I data base.
|Additional Information:||© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2008 July 8. Received 2008 July 8; in original form 2008 May 13. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max-Planck Society and the Higher Education Funding Council for England. The SDSS web site is http://www.sdss.org/. We thank the anonymous referee for comments that improved the presentation.|
|Subject Keywords:||surveys; supernovae: general; cosmology: observations|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||03 Dec 2008 23:46|
|Last Modified:||26 Dec 2012 10:31|
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