Type Ia Supernovae Rates and Galaxy Clustering from the CFHT Supernova Legacy Survey
Abstract
The Canada-France-Hawaii Telescope Supernova Legacy Survey (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. 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 two of expectations from the two component SNIa rate model.
Keywords
Cite
@article{arxiv.0801.4968,
title = {Type Ia Supernovae Rates and Galaxy Clustering from the CFHT Supernova Legacy Survey},
author = {M. L. Graham and C. J. Pritchet and M. Sullivan and S. D. J. Gwyn and J. D. Neill and E. Y. Hsiao and P. Astier and D. Balam and C. Balland and S. Basa and R. G. Carlberg and A. Conley and D. Fouchez and J. Guy and D. Hardin and I. M. Hook and D. A. Howell and R. Pain and K. Perrett and N. Regnault and S. Baumont and J. Le Du and C. Lidman and S. Perlmutter and P. Ripoche and N. Suzuki and E. S. Walker and T. Zhang},
journal= {arXiv preprint arXiv:0801.4968},
year = {2010}
}
Comments
21 pages, 2 figures, 6 tables, accepted for publication in AJ