The Core-collapse rate from the Supernova Legacy Survey
| Autor: | Bazin, G., Palanque-Delabrouille, N., Rich, J., Ruhlmann-Kleider, V., Aubourg, E., Guillou, L. Le, Astier, P., Balland, C., Basa, S., Carlberg, R. G., Conley, A., Fouchez, D., Guy, J., Hardin, D., Hook, I. M., Howell, D. A., Pain, R., Perrett, K., Pritchet, C. J., Regnault, N., Sullivan, M., Antilogus, P., Arsenijevic, V., Baumont, S., Fabbro, S., Du, J. Le, Lidman, C., Mouchet, M., Mourão, A., Walker, E. S. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | A&A 499, 653-660(2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/200911847 |
| Popis: | We use three years of data from the Supernova Legacy Survey (SNLS) to study the general properties of core-collapse and type Ia supernovae. This is the first such study using the "rolling search" technique which guarantees well-sampled SNLS light curves and good efficiency for supernovae brighter than $i^\prime\sim24$. Using host photometric redshifts, we measure the supernova absolute magnitude distribution down to luminosities $4.5 {\rm mag}$ fainter than normal SNIa. Using spectroscopy and light-curve fitting to discriminate against SNIa, we find a sample of 117 core-collapse supernova candidates with redshifts $z<0.4$ (median redshift of 0.29) and measure their rate to be larger than the type Ia supernova rate by a factor $4.5\pm0.8(stat.) \pm0.6 (sys.)$. This corresponds to a core-collapse rate at $z=0.3$ of $[1.42\pm 0.3(stat.) \pm0.3(sys.)]\times10^{-4}\yr^{-1}(h_{70}^{-1}\Mpc)^{-3}$. Comment: accepted Astronomy and Astrophysics |
| Databáze: | arXiv |
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