Sullivan, M. and Le Borgne, D. and Pritchet, C. J. and Hodsman, A. and Neill, J. D. and Howell, D. A. and Carlberg, R. G. and Astier, P. and Aubourg, E. and Balam, D. and Basa, S. and Conley, A. and Fabbro, S. and Fouchez, D. and Guy, J. and Hook, I. and Taillet, R. and Baumont, S. and Bronder, J. and Ellis, R. S. and Filiol, M. and Lusset, V. and Perlmutter, S. and Ripoche, P. and Tao, C. (2006) Rates and properties of Type Ia supernovae as a function of mass and star formation in their host galaxies. Astrophysical Journal, 648 (2). pp. 868-883. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:SULapj06
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:SULapj06
We show that Type Ia supernovae (SNe Ia) are formed within both very young and old stellar populations, with observed rates that depend on the stellar mass and mean star formation rates (SFRs) of their host galaxies. Models in which the SN Ia rate depends solely on host galaxy stellar mass are ruled out with >99% confidence. Our analysis is based on 100 spectroscopically confirmed SNe Ia, plus 24 photometrically classified events, all from the Supernova Legacy Survey (SNLS) and distributed over 0.2 < z < 0.75. We estimate stellar masses and SFRs for the SN Ia host galaxies by fitting their broadband spectral energy distributions with the galaxy spectral synthesis code PÉGASE.2. We show that the SN Ia rate per unit mass is proportional to the specific SFR of the parent galaxies—more vigorously star-forming galaxies host more SNe Ia per unit stellar mass, broadly equivalent to the trend of increasing SN Ia rate in later type galaxies seen in the local universe. Following earlier suggestions for a simple "two-component" model approximating the SN Ia rate, we find bivariate linear dependencies of the SN Ia rate on both the stellar masses and the mean SFRs of the host systems. We find that the SN Ia rate can be well represented as the sum of 5.3 ± 1.1 × 10 to the -14 SNe yr to the -1 M(.)to the -1 and 3.9 ± 0.7 × 10 to the -4 SNe yr to the -1 (M(.) yr to the -1)to the -1 of star formation. We also demonstrate a dependence of distant SN Ia light-curve shapes on star formation in the host galaxy, similar to trends observed locally. Passive galaxies, with no star formation, preferentially host faster declining/dimmer SNe Ia, while brighter events are found in systems with ongoing star formation.
|Additional Information:||© 2006 The American Astronomical Society. Received 2006 February 6; accepted 2006 May 17. The SNLS collaboration gratefully acknowledges the assistance of Pierre Martin and the CFHT Queued Service Observations team. Jean-Charles Cuillandre and Kanoa Withington were also indispensable in making possible real-time data reduction at CFHT. We thank Lars Bildsten and Evan Scannapieco for useful discussions, and Andrew Hopkins for providing a copy of Hopkins & Beacom (2006) prior to submission. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at the Canadian Astronomy Data Centre as part of the CFHT Legacy Survey, a collaborative project of NRC and CNRS. Canadian collaboration members acknowledge support from NSERC and CIAR; French collaboration members from CNRS/IN2P3, CNRS/INSU, and CEA. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The views expressed in this article are those of the authors and do not reflect the official policy or position of the United States Air Force, Department of Defense, or the US government.|
|Subject Keywords:||distance scale — galaxies: evolution — supernovae: general — surveys|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Lindsay Cleary|
|Deposited On:||10 Jan 2007|
|Last Modified:||26 Dec 2012 09:29|
Repository Staff Only: item control page