Type Ia supernova rate at a redshift of ~ 0.1

G. Blanc (1) , C. Afonso (1, 2) , C. Alard (3) , J.N. Albert (4) , G. Aldering , A. Amadon (1) , J. Andersen , R. Ansari (4) , E. Aubourg (1) , C. Balland (5, 6) , P. Bareyre (1, 2) , J.P. Beaulieu (7) , X. Charlot (1) , A. Conley , C. Coutures (1) , T. Dahlen , F. Derue (5) , X. Fan , R. Ferlet (7) , G. Folatelli , P. Fouque (8) , G. Garavini , J.F. Glicenstein (1) , B. Goldman (1, 2) , A. Goobar (1) , A. Gould (1) , D. Graff , M. Gros (1) , J. Haissinski (4) , C. Hamadache (1) , D. Hardin (5) , I.M. Hook , J. Dekat (1) , S. Kent , A. Kim , T. Lasserre (1) , L. Leguillou (1) , E. Lesquoy (1, 7) , C. Loup (7) , C. Magneville (1) , J.B. Marquette (7) , E. Maurice , A. Maury , A. Milsztajn (1) , M. Moniez (4) , M. Mouchet (9) , H. Newberg , S. Nobili , N. Palanque-Delabrouille (1) , O. Perdereau (4) , L. Prevot , Y.R. Rahal (4) , N. Regnault (4, 10) , J. Rich (1) , P. Ruiz-Lapuente , M. Spiro (1) , P. Tisserand (1) , A. Vidal-Madjar (7) , L. Vigroux (1) , N.A. Walton , S. Zylberajch (1)

1 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 PCC (UMR 7553) - Physique Corpusculaire et Cosmologie
3 GEPI - Galaxies, Etoiles, Physique, Instrumentation
4 LAL - Laboratoire de l'Accélérateur Linéaire
5 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
6 IAS - Institut d'astrophysique spatiale
7 IAP - Institut d'Astrophysique de Paris
8 UMS 831 - Services communs OMP
9 LUTH (UMR_8102) - Laboratoire Univers et Théories
10 LLR - Laboratoire Leprince-Ringuet

We present the type Ia rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type Ia were discovered. The measurement of the detection efficiency, using a Monte Carlo simulation, provides the type Ia supernova explosion rate at a redshift ~ 0.13. The result is $0.125^{+0.044+0.028}_{-0.034-0.028} h_{70}^2$ SNu where 1 SNu = 1 SN / $10^{10} L_{sun}^B$ / century. This value is compatible with the previous EROS measurement (Hardin et al. 2000), done with a much smaller sample, at a similar redshift. Comparison with other values at different redshifts suggests an evolution of the type Ia supernova rate.

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

G. Blanc, C. Afonso, C. Alard, J.N. Albert, G. Aldering, et al.. Type Ia supernova rate at a redshift of ~ 0.1. Astronomy and Astrophysics - A&A, 2004, 423, pp.881-894. ⟨10.1051/0004-6361:20035948⟩. ⟨in2p3-00023735⟩