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

Type Ia supernova rate at  ^*

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 <sup>1

1</sup> 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 () 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: at an average redshift of 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)

SIMBAD Objects

Contents

• 1. Introduction
• 2. The search technique
• 3. The data set
• 4. The galaxy sample
  • 4.1. Galaxy identification
  • 4.2. Magnitude-redshift relationship
• 5. The detection efficiency and the supernova rate
  • 5.1. Supernova simulation
  • 5.2. Detection efficiency
  • 5.3. Redshift distribution
  • 5.4. Explosion rate
• 6. Discussion
  • 6.1. Calibration
  • 6.2. Galaxy counts and redshift distribution
  • 6.3. Supernova luminosity distribution
  • 6.4. Total number of detected type Ia
• 7. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: October 24, 2000
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