Type Ia supernova rate at $z \sim 0.1$

D P. Hardin , C. Afonso , C. Alard , J N. Albert , A. Amadon , J. Andersen , R. Ansari (1) , E. Aubourg , P. Bareyre (2) , F. Bauer , J P. Beaulieu , G. Blanc , A. Bouquet (2) , S. Char , X. Charlot , F. Couchot (1) , C. Coutures , F. Derue (1) , R. Ferlet , J F. Glicenstein , B. Goldman , A. Gould , D. Graff , M H. Gros , J. Haissinski (1) , J C. Hamilton (2) , J. Kat , A. Kim (2) , T. Lasserre , E. Lesquoy , C. Loup , C. Magneville , B. Mansoux (1) , J B. Marquette , E. Maurice , A. Milsztajn , M. Moniez (1) , N. Palanque-Delabrouille , O. Perdereau (1) , L. Prevot , N. Regnault (1) , J. Rich , M. Spiro , A. Vidal-Madjar , L. Vigroux , S. Zylberajch

1 LAL - Laboratoire de l'Accélérateur Linéaire
2 PCC (UMR 7553) - Physique Corpusculaire et Cosmologie

We present the EROS nearby supernova ($z \sim 0.02 - 0.2$) search and the analysis of the first year of data (1997). A total of 80 square degrees were surveyed. Eight supernov{æ} were detected, four of which were spectroscopically identified as type Ia supernov{æ}. The search efficiency was determined with a Monte-Carlo simulation taking into account the efficiencies for both supernova detection and host galaxy identification. Assuming that for a given galaxy the supernova rate is proportional to the galactic luminosity, we compute a type Ia supernova explosion rate of: ${\cal R} = 0.44 {}_{-0.21}^{+0.35} {}_{-0.07}^{+0.13} h^2: / 10^{10} \lbsun / 100 {\rm yrs}$ at an average redshift of $\sim 0.1$ where the errors are respectively statistical and systematic (type misidentification included).

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]

D P. Hardin, C. Afonso, C. Alard, J N. Albert, A. Amadon, et al.. Type Ia supernova rate at $z \sim 0.1$. Astronomy and Astrophysics - A&A, 2000, 362, pp.419-425. ⟨in2p3-00018511⟩