Type Ia Supernova Rates in Radio-Loud and Infrared Galaxies from the CFHT Supernova Legacy Survey

Astronomy and Astrophysics – Astronomy

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Scientific paper

Previous surveys found the type Ia supernova (SN Ia) rate per unit mass in low redshift radio-loud early-type galaxies to be a factor of 2 to 7 higher than in radio-quiet early-type galaxies. The large, intermediate redshift SN\,Ia database compiled by the Canada-France-Hawaii Telescope Supernovae Legacy Survey (CFHT SNLS) has now been combined with photometric redshift catalogs, VLA 1.4 GHz radio catalogs (VLA-VIRMOS and COSMOS surveys), and Spitzer infrared catalogs (SWIRE and S-COSMOS). We identify the radio loud galaxy population and show that our finding five SNLS SN Ia hosts in this subset to be consistent with both expectations of the standard two-component SN Ia rate model and an enhanced rate in radio-loud galaxies. The infrared properties of radio loud SN Ia hosts indicate some dust-obscured star formation, and for the first time we incorporate an "A+B" model derived from infrared host properties in our discussion.

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