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The supernova rate in local galaxy clusters

Mannucci, F. and Maoz, D. and Sharon, K. and Botticella, M. T. and Della Valle, M. and Gal-Yam, A. and Panagia, N. (2008) The supernova rate in local galaxy clusters. Monthly Notices of the Royal Astronomical Society, 383 (3). pp. 1121-1130. ISSN 0035-8711. doi:10.1111/j.1365-2966.2007.12603.x.

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We report a measurement of the supernova (SN) rates (Type Ia and core-collapse) in galaxy clusters based on the 136 supernovae of the sample described in Cappellaro, Evans & Turatto, and Mannucci et al. Early-type cluster galaxies show a Type Ia SN rate (0.066 SNuM) similar to that obtained by Sharon et al. and more than three times larger than that in field early-type galaxies (0.019 SNuM). This difference has a 98 per cent statistical confidence level. We examine many possible observational biases which could affect the rate determination, and conclude that none of them is likely to significantly alter the results. We investigate how the rate is related to several properties of the parent galaxies, and find that cluster membership, morphology and radio power all affect the SN rate, while galaxy mass has no measurable effect. The increased rate may be due to galaxy interactions in clusters, inducing either the formation of young stars or a different evolution of the progenitor binary systems. We present the first measurement of the core-collapse SN rate in cluster late-type galaxies, which turns out to be comparable to the rate in field galaxies. This suggests that no large systematic difference in the initial mass function exists between the two environments.

Item Type:Article
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Della Valle, M.0000-0003-3142-5020
Gal-Yam, A.0000-0002-3653-5598
Additional Information:© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 October 16. Received 2007 October 4; in original form 2007 July 26. We thank Sperello di Serego and the MEGA group (Arcetri Extragalactic Meeting) for useful discussions about the properties of elliptical galaxies. This research has made use of the NASA/IPAC Extragalactic Data base (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. DM, MD and AG thank the Kavli Institute for Theoretical Physics for its hospitality. This research was supported in part by the National Science Foundation under Grant No. PHY05-51164.
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Subject Keywords:supernovae
Issue or Number:3
Record Number:CaltechAUTHORS:MANmnras08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11380
Deposited By: Tony Diaz
Deposited On:12 Aug 2008 16:28
Last Modified:08 Nov 2021 21:57

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