Type Ia supernova rate at a redshift of ~;0.1

Astronomy & Astrophysics manuscript no. rate (DOI: will be inserted by hand later) May 12, 2004 Type Ia supernova rate at a redshift of ∼ 0.1 G. Blanc 1,12,22 , C. Afonso 1,4,8,23 , C. Alard 24 , J.N. Albert 2 , G. Aldering 15,28 , A. Amadon 1 , J. Andersen 6 , R. Ansari 2 , E. Aubourg 1 , C. Balland 13,21 , P. Bareyre 1,4 , J.P. Beaulieu 5 , X. Charlot 1 , A. Conley 15,28 , 1 , T. Dahl´ n 19 , F. Derue 13 , X. Fan 16 , R. Ferlet 5 , G. Folatelli 11 , P. Fouqu´ 9,10 , G. Garavini 11 , C. Coutures e e J.F. Glicenstein 1 , B. Goldman 1,4,8,23 , A. Goobar 11 , A. Gould 1,7 , D. Graff 7 , M. Gros 1 , J. Haissinski 2 , C. Hamadache 1 , D. Hardin 13 , I.M. Hook 25 , J. de Kat 1 , S. Kent 18 , A. Kim 15 , T. Lasserre 1 , L. Le Guillou 1 , E. Lesquoy 1,5 , C. Loup 5 , C. Magneville 1 , J.B. Marquette 5 , E. Maurice 3 , A. Maury 9 , A. Milsztajn 1 , M. Moniez 2 , M. Mouchet 20,22 , H. Newberg 17 , S. Nobili 11 , N. Palanque-Delabrouille 1 , O. Perdereau 2 , L. Pr´ vot 3 , Y.R. Rahal 2 , N. Regnault 2,14,15 , J. Rich 1 , P. Ruiz-Lapuente 27 , M. Spiro 1 , P. Tisserand 1 , e A. Vidal-Madjar 5 , L. Vigroux 1 , N.A. Walton 26 , S. Zylberajch 1 . arXiv:astro-ph/0405211 v1 11 May 2004 DSM/DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France Laboratoire de l’Acc´ l´ rateur Lin´ aire, IN2P3 CNRS, Universit´ Paris-Sud, 91405 Orsay Cedex, France e e e e Observatoire de Marseille, 2 pl. Le Verrier, 13248 Marseille Cedex 04, France Coll` ge de France, Physique Corpusculaire et Cosmologie, IN2P3 CNRS, 11 pl. M. Berthelot, 75231 Paris e Cedex, France Institut d’Astrophysique de Paris, INSU CNRS, 98 bis Boulevard Arago, 75014 Paris, France Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark Departments of Astronomy and Physics, Ohio State University, Columbus, OH 43210, U.S.A. Department of Astronomy, New Mexico State University, Las Cruces, NM 88003-8001, U.S.A. European Southern Observatory (ESO), Casilla 19001, Santiago 19, Chile Observatoire Midi-Pyr´ n´ es, 14 avenue Edouard Belin, 31400 Toulouse, France e e Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden Osservatorio Astronomico di Padova, INAF, vicolo dell’Osservatorio 5 - 35122 Padova, Italy Laboratoire de Physique Nucl´ aire et de Hautes Energies, IN2P3 - CNRS - Universit´ s Paris 6 et Paris 7, 4 e e place Jussieu, 75252 Paris Cedex 05, France Laboratoire Leprince-Ringuet, LLR/Ecole Polytechnique, Route de Saclay, 91128 Palaiseau CEDEX, France Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, CA 94720, U.S.A. Steward Observatory, The University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721-0065, U.S.A. Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180, U.S.A. Fermilab Wilson and Kirk Roads, Batavia, IL 60510-0500, U.S.A. Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, U.S.A. LUTH, Observatoire de Paris, 5, Place Jules Janssen, 92195 Meudon Cedex, France Institut d’Astrophysique Spatiale, Bˆ timent 121, Universit´ Paris 11, 91405 Orsay Cedex, France a e Universit´ Paris 7 Denis Diderot, 2, place Jussieu, 75005 Paris, France e NASA/Ames Research Center, Mail Stop 244, Moffet Field, CA 94035, U.S.A. GEPI, Observatoire de Paris, 77 avenue de l’Observatoire, 75014 Paris, France Department of Physics, University of Oxford, Nuclear and Astrophysics laboratory, Keble Road, Oxford OX1 3RH, UK Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK Department of Astronomy, University of Barcelona, Barcelona, Spain Visiting astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation. Received / Accepted Abstract. 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 h 2 SNu where 1 SNu = 1 SN / 10 10 L 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. Key words. (Stars:) supernovae: general – Galaxies: evolution