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Astron. Astrophys. 362, 419-425 (2000)


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Type Ia supernova rate at [FORMULA] *

The EROS collaboration
D. Hardin **  1, C. Afonso 1, C. Alard 9, J.N. Albert 2, A. Amadon 1, J. Andersen 6, R. Ansari 2, É. Aubourg 1, P. Bareyre 1,4, F. Bauer 1, J.P. Beaulieu 5, G. Blanc 1, A. Bouquet 4, S. Char 7, X. Charlot 1, F. Couchot 2, C. Coutures 1, F. Derue 2, R. Ferlet 5, J.F. Glicenstein 1, B. Goldman 1, A. Gould 1,8, D. Graff 8, M. Gros 1, J. Haissinski 2, J.C. Hamilton 4, J. de Kat 1, A. Kim 4, T. Lasserre 1, É. Lesquoy 1, C. Loup 5, C. Magneville 1, B. Mansoux 2, J.B. Marquette 5, É. Maurice 3, A. Milsztajn 1, M. Moniez 2, N. Palanque-Delabrouille 1, O. Perdereau 2, L. Prévot 3, N. Regnault 2, J. Rich 1, M. Spiro 1, A. Vidal-Madjar 5, L. Vigroux 1 and S. Zylberajch 1


1 CEA, DSM, DAPNIA, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France
2 Laboratoire de l'Accélérateur Linéaire, IN2P3 CNRS, Université de Paris-Sud, 91405 Orsay Cedex, France
3 Observatoire de Marseille, 2 pl. Le Verrier, 13248 Marseille Cedex 04, France
4 Collège de France, Physique Corpusculaire et Cosmologie, IN2P3-CNRS, 11 pl. M. Berthelot, 75231 Paris Cedex, France
5 Institut d'Astrophysique de Paris, INSU-CNRS, 98 bis Boulevard Arago, 75014 Paris, France
6 Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
7 Universidad de la Serena, Facultad de Ciencias, Departamento de Fisica, Casilla 554, La Serena, Chile
8 Departments of Astronomy and Physics, Ohio State University, Columbus, OH 43210, USA
9 DASGAL, 77 avenue de l'Observatoire, 75014 Paris, France

Received 9 March 2000 / Accepted 15 June 2000

Abstract

We present the EROS nearby supernova ([FORMULA]) search and the analysis of the first year of data (1997). A total of 80 square degrees were surveyed. Eight supernovæ were detected, four of which were spectroscopically identified as type Ia supernovæ. 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: [FORMULA] at an average redshift of [FORMULA] where the errors are respectively statistical and systematic (type misidentification included).

Key words: surveys – stars: statistics – stars: supernovae: general – cosmology: observations – cosmology: distance scale

* This work is based on observations made at the European Southern Observatory, La Silla, Chile.
** Now at LPNHE, Université Paris VI, 4 place Jussieu, F-75252 Paris Cedex 05, France

Send offprint requests to: D. Hardin (hardin@in2p3.fr)

© European Southern Observatory (ESO) 2000

Online publication: October 24, 2000

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