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Title:
Supernovae in the Subaru Deep Field: an initial sample and Type Ia rate out to redshift 1.6
Authors:
Poznanski, D.; Maoz, D.; Yasuda, N.; Foley, R. J.; Doi, M.; Filippenko, A. V.; Fukugita, M.; Gal-Yam, A.; Jannuzi, B. T.; Morokuma, T.; Oda, T.; Schweiker, H.; Sharon, K.; Silverman, J. M.; Totani, T.
Affiliation:
AA(School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel), AB(School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel; Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106-4030, USA), AC(Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582, Japan), AD(Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA), AE(Institute of Astronomy, University of Tokyo, Mitaka, Tokyo 181-8588, Japan), AF(Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA), AG(Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582, Japan), AH(Astrophysics Group, Physics Faculty, Weizmann Institute of Science, Rehovot 76100, Israel; Astronomy Department, California Institute of Technology, Pasadena, CA 91125, USA; Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106-4030, USA), AI(National Optical Astronomy Observatory, Tucson, AZ 85726-6732, USA), AJ(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan), AK(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan), AL(WIYN Consortium, Inc., 950 North Cherry Avenue, Tucson, AZ 85719, USA), AM(School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel), AN(Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA), AO(Department of Astronomy, School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 382, Issue 3, pp. 1169-1186. (MNRAS Homepage)
Publication Date:
12/2007
Origin:
MNRAS
MNRAS Keywords:
surveys, supernovae: general, cosmology: miscellaneous, cosmology: observations
Abstract Copyright:
(c) 2007 The Authors. Journal compilation © 2007 RAS
DOI:
10.1111/j.1365-2966.2007.12424.x
Bibliographic Code:
2007MNRAS.382.1169P

Abstract

Large samples of high-redshift supernovae (SNe) are potentially powerful probes of cosmic star formation, metal enrichment and SN physics. We present initial results from a new deep SN survey, based on re-imaging in the R,i', z' bands, of the 0.25deg2 Subaru Deep Field (SDF), with the 8.2-m Subaru telescope and Suprime-Cam. In a single new epoch consisting of two nights of observations, we have discovered 33 candidate SNe, down to a z'-band magnitude of 26.3 (AB). We have measured the photometric redshifts of the SN host galaxies, obtained Keck spectroscopic redshifts for 17 of the host galaxies and classified the SNe using the Bayesian photometric algorithm of Poznanski et al. that relies on template matching. After correcting for biases in the classification, 55 per cent of our sample consists of Type Ia SNe and 45 per cent of core-collapse SNe. The redshift distribution of the SNe Ia reaches z ~ 1.6, with a median of z ~ 1.2. The core-collapse SNe reach z ~ 1.0, with a median of z ~ 0.5. Our SN sample is comparable to the Hubble Space Telescope/Great Observatories Origins Deep Survey (GOODS) sample in both size and redshift range. The redshift distributions of the SNe in the SDF and in GOODS are consistent, but there is a trend (which requires confirmation using a larger sample) for more high-z SNe Ia in the SDF. This trend is also apparent when comparing the SN Ia rates we derive to those based on GOODS data. Our results suggest a fairly constant rate at high redshift that could be tracking the star formation rate. Additional epochs on this field, already being obtained, will enlarge our SN sample to the hundreds, and determine whether or not there is a decline in the SN Ia rate at z >~ 1.

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