Issue |
A&A
Volume 400, Number 3, March IV 2003
|
|
---|---|---|
Page(s) | 951 - 956 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20030087 | |
Published online | 07 March 2003 |
Limits on Galactic dark matter with 5 years of EROS SMC data*
1
DSM/DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
2
Collège de France, Physique Corpusculaire et Cosmologie, IN2P3 CNRS, 11 Pl. M. Berthelot, 75231 Paris Cedex, France
3
Department of Astronomy, New Mexico State University, Las Cruces, NM 88003-8001, USA
4
Laboratoire de l'Accélérateur Linéaire, IN2P3 CNRS, Université Paris-Sud, 91405 Orsay Cedex, France
5
Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
6
Institut d'Astrophysique de Paris, INSU CNRS, 98bis boulevard Arago, 75014 Paris, France
7
European Southern Observatory (ESO), Casilla 19001, Santiago 19, Chile
8
Observatoire de Paris, LESIA, 92195 Meudon Cedex, France
9
Departments of Astronomy and Physics, Ohio State University, Columbus, OH 43210, USA
10
Observatoire de Marseille, 2 Pl. Le Verrier, 13248 Marseille Cedex 04, France
Corresponding author: N. Palanque-Delabrouille, Nathalie.Palanque-Delabrouille@cea.fr
Received:
16
December
2002
Accepted:
17
January
2003
Five years of eros data towards the Small Magellanic Cloud have been
searched for gravitational microlensing events, using a new, more
accurate method to assess the impact of stellar blending on the
efficiency. Four long-duration candidates have been found which, if
they are microlensing events, hint at a non-halo population of lenses.
Combined with results from other
eros observation programs, this analysis yields strong limits on the amount of
Galactic dark matter made of compact objects. Less than 25% of a
standard halo can be composed of objects with a mass between
and 1
at the 95% C.L.
Key words: Galaxy: halo / Galaxy: kinematics and dynamics / Galaxy: stellar content / cosmology: dark matter / gravitational lensing
© ESO, 2003
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