Henrique S. Xavier, Ravi R. Gupta, Masao Sako, Chris B. D'Andrea, Joshua A. Frieman, Lluis Galbany, Peter M. Garnavich, John Marriner, Robert C. Nichol, Matthew D. Olmstead, Donald P. Schneider, Mathew Smith
Using the GMBCG galaxy cluster catalogue and SDSS II supernovae data with redshifts measured by the BOSS project, we identified 48 SNe Ia residing in rich galaxy clusters (32 of which had useful host galaxy information) and analysed their properties. While most of their characteristics are consistent with other SNe Ia, their lightcurve stretch distribution is different from SNe Ia in the field. Although this result is consistent with a strong presence of passive host galaxies in our cluster sample, the consistency drops down for the inner parts of the cluster. We found evidences that the cluster environment might intensify the preference of SNe Ia in passive hosts for lower stretch. We also confirm previously known relations between SNe Ia and host properties and report that old passive galaxies host SNe Ia with lower stretch than young passive galaxies. We argue that this result is likely to be responsible for the lower stretch found for SNe Ia in rich clusters.
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http://arxiv.org/abs/1304.6431
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