The Type Ia Supernova Rate in Radio and Infrared Galaxies from the CFHT Supernova Legacy Survey
Graham, M. L. · Pritchet, C. J. · Sullivan, M. · Howell, D. A. · Gwyn, S. D. J. · Astier, P. · Balland, C. · Basa, S. · Carlberg, R. G. · Conley, A. · Fouchez, D. · Guy, J. · Hardin, D. · Hook, I. M. · Pain, R. · Perrett, K. · Regnault, N. · Rich, J. · Balam, D. · Fabbro, S. · Hsiao, E. Y. · Mourao, A. · Palanque-Delabrouille, N. · Perlmutter, S. · Ruhlman-Kleider, V. · Suzuki, N. · Fakhouri, H. K. · Walker, E. S.
Original · EN
We have combined the large SN Ia database of the Canada-France-Hawaii Telescope Supernova Legacy Survey and catalogs of galaxies with photometric redshifts, VLA 1.4 GHz radio sources, and Spitzer infrared sources. We present eight SNe Ia in early-type host galaxies which have counterparts in the radio and infrared source catalogs. We find the SN Ia rate in subsets of radio and infrared early-type galaxies is 1-5 times the rate in all early-type galaxies, and that any enhancement is always < 2 sigma. Rates in these subsets are consistent with predictions of the two component "A+B" SN Ia rate model. Since infrared properties of radio SN Ia hosts indicate dust obscured star formation, we incorporate infrared star formation rates into the "A+B" model. We also show the properties of SNe Ia in radio and infrared galaxies suggest the hosts contain dust and support a continuum of delay time distributions for SNe Ia, although other delay time distributions cannot be ruled out based on our data.
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