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Astronomical Journal 132 (2006) 1126-1145
The Type Ia Supernova Rate at z ~0.5 from the Supernova Legacy Survey
J.D. Neill, M. Sullivan, D. Balam, C.J. Pritchet, D.A. Howell, K. Perrett, P. Astier1, E. Aubourg2, 3, S. Basa4, 5, R.G. Carlberg, A. Conley, S. Fabbro, D. Fouchez, J. Guy1, I. Hook, R. Pain1, N. Palanque-Delabrouille3, N. Regnault1, J. Rich3, Richard Taillet1, G. Aldering, P. Antilogus1, C. Balland2, S. Baumont1, J. Bronder, R.S. Ellis, M. Filiol, A. Goncalves, M. Kowalski, C. Lidman6, V. Lusset3, M. Mouchet2, S. Perlmutter, P. Ripoche, D. Schlegel, C. Tao
SNLS Collaboration(s)

We present a measurement of the distant Type Ia supernova rate derived from the first two years of the Canada -- France -- Hawaii Telescope Supernova Legacy Survey. We observed four one-square degree fields with a typical temporal frequency of ~ 4 observer-frame days over time spans of from 158 to 211 days per season for each field, with breaks during full moon. We used 8-10 meter-class telescopes for spectroscopic followup to confirm our candidates and determine their redshifts. Our starting sample consists of 73 spectroscopically verified Type Ia supernovae in the redshift range 0.2 < z < 0.6. We derive a volumetric SN Ia rate of r_V(=0.47) = 0.42^{+0.13}_{-0.09} (systematic) +- 0.06 (statistical) X 10^-4 yr^-1 Mpc^3, assuming h = 0.7, Omega_m = 0.3 and a flat cosmology. Using recently published galaxy luminosity functions derived in our redshift range, we derive a SN Ia rate per unit luminosity of r_L(=0.47) = 0.154^{+0.048}_{-0.033} (systematic) ^{+0.039}_{-0.031} (statistical) SNu. Using our rate alone, we place an upper limit on the component of SN Ia production that tracks the cosmic star formation history of 1 SN Ia per 10^3 M_sun of stars formed. Our rate and other rates from surveys using spectroscopic sample confirmation display only a modest evolution out to z=0.55.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
4 :  CPPM - Centre de Physique des Particules de Marseille
5 :  LAM - Laboratoire d'Astrophysique de Marseille
6 :  LUTH - Laboratoire Univers et Théories
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
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