[152.04] SNLS: Type Ia Supernova Rates from the SNLS Survey: the Connection with Morphology and Star Formation Rate

AAS 207th Meeting, 8-12 January 2006
Session 152 Cosmology, Early Universe, Cosmic Distance Scale II
Oral, Wednesday, 10:00-11:30am, January 11, 2006, Balcony A

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[152.04] SNLS: Type Ia Supernova Rates from the SNLS Survey: the Connection with Morphology and Star Formation Rate

C.J. Pritchet (U. Victoria), M. Sullivan (U. Toronto), S. Gwyn (U. Victoria), P. Astier (LPNHE, CNRS-IN2P3), E. Aubourg (CEA Saclay), D. Balam (U. Victoria), S. Basa (LAM, CNRS Marseille), R.G. Carlberg, A. Conley (U. Toronto), S. Fabbro (CENTRA, IST Lisbon), D. Fouchez (CPPM, CNRS-IN2P3), J. Guy (LPNHE, CNRS-IN2P3), I. Hook (U. Oxford), D.A. Howell (U. Toronto), H. Lafoux (CEA Saclay), J.D. Neill (U. Victoria), R. Pain, N. Palanque-Delabrouille (LPNHE, CNRS-IN2P3), K. Perrett (U. Toronto), N. Regnault (LPNHE, CNRS-IN2P3), J. Rich (CEA Saclay), R. Taillet, S. Baumont (LPNHE, CNRS-IN2P3), J. Bronder (U. Oxford), V. Lusset (CEA Saclay), P. Ripoche (CPPM, CNRS-IN2P3), A. Mourao (CENTRA, IST Lisbon), S. Perlmutter (LBNL, Berkeley), M. Graham, E. Hsiao (U. Victoria)

Analysis of 150 SNLS Survey Type Ia supernovae (0.2 < z < 0.9, all with spectroscopic identification) shows a strong connection between SNIa rate, normalized per unit mass, and star formation rate or galaxy morphology. This correlation is in the sense that the rate per unit mass in Irr galaxies is more than a factor of 10 higher than that in E/S0 galaxies. This result independently confirms that found for SNLS SNeIa by Sullivan et al (this meeting), but makes use of different photometric redshifts for the field population (Gwyn et al. 2005), and different M/L and star formation rate estimators. The SFR/morphology dependence of SNIa rate is, to first order, independent of redshift. The observations can be explained in terms of one or two component models for the origin of SNeIa (Howell et al., this meeting).

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The author(s) of this abstract have provided an email address for comments about the abstract: pritchet@uvic.ca

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