Galaxy Clustering in Environments of Type Ia Supernovae from the CFHT Supernova Legacy Survey (SNLS).

Astronomy and Astrophysics – Astronomy

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Scientific paper

The Canada-France-Hawaii Telescope Supernovae Legacy Survey (CFHT SNLS) has created the largest homogeneous database of intermediate redshift (0.2 < z < 0.9) type Ia supernovae (SNe Ia). The SNLS team has shown that correlations exist between SN Ia rates, properties, and host galaxy star formation rate (SFR) (Sullivan et al. 2006). The SNLS SN Ia database has now been combined with photometric redshift catalogs (Ilbert et al. 2006, Gwyn 2006) 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. This paper will present the methods used to quantify galaxy clustering, and show that an influence on SN Ia rates and properties from galaxy clustering is improbable. This work has been supported by NSERC and the University of Victoria.

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