Graham, M. L. and Pritchet, C. J. and Sullivan, M. and Gwyn, S. D. J. and Neill, J. D. and Hsiao, E. Y. and Astier, P. and Balam, D. and Balland, C. and Basa, S. and Carlberg, R. G. and Conley, A. and Fouchez, D. and Guy, J. and Hardin, D. and Hook, I. M. and Howell, D. A. and Pain, R. and Perrett, K. and Regnault, N. and Baumont, S. and Le Du7, J. and Lidman, C. and Perlmutter, S. and Ripoche, P. and Suzuki, N. and Walker, E. S. and Zhang, T. (2008) Type Ia supernovae rates and galaxy clustering from the CFHT supernova legacy survey. Astronomical Journal, 135 (4). pp. 1343-1349. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20090515-133448742
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The Canada-France-Hawaii Telescope Supernova Legacy Survey (CFHT SNLS) has created a large homogeneous database of intermediate redshift (0.2 < z < 1.0) type Ia supernovae (SNe Ia). The SNLS team has shown that correlations exist between SN Ia rates, properties, and host galaxy star-formation rates (SFRs). The SNLS SN Ia database has now been combined with a photometric redshift galaxy catalog and an optical galaxy cluster catalog to investigate the possible influence of galaxy clustering on the SN Ia rate, over and above the expected effect due to the dependence of SFR on clustering through the morphology-density relation. We identify three cluster SNe Ia, plus three additional possible cluster SNe Ia, and find the SN Ia rate per unit mass in clusters at intermediate redshifts is consistent with the rate per unit mass in field early-type galaxies and the SN Ia cluster rate from low-redshift cluster targeted surveys. We also find the number of SNe Ia in cluster environments to be within a factor of 2 of expectations from the two-component SN Ia rate model.
|Additional Information:||We gratefully acknowledge the CFHT Queued Service Observations team, Olivier Ilbert and Henry McCracken for early access to and correspondence regarding their photometric redshift galaxy catalog, Lisbeth Olsen for early access the optical cluster catalog, Jon Willis and Dan Maoz for helpful conversations, and our anonymous referee for constructive correspondence. This paper is based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the CFHT, which is operated by the National Research Council of Canada, the Institut National des Science de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This paper is also based on spectroscopic observations obtained at the Gemini Observatory which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership; the Very Large Telescope at the European Southern Observatory in Paranal, Chile; theW. M. Keck Observatory which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration; and the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This work is based in part on data products from the Canadian Astronomy Data Centre as part of the CFHT Legacy Survey, a collaborative project of NRC and CNRS. This work has been supported by NSERC and the University of Victoria. Facilities: CFHT.|
|Subject Keywords:||galaxies; clusters; general; supernovae; general|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||09 Jul 2009 23:52|
|Last Modified:||26 Dec 2012 11:00|
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