White dwarfs and Galactic dark matter

Details White dwarfs and Galactic dark matter White dwarfs and Galactic dark matter

2002-02-13

arxiv.org/abs/astro-ph/0202244v1

Mon.Not.Roy.Astron.Soc. 339 (2003) 817

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures. MNRAS style file

Scientific paper

10.1046/j.1365-8711.2003.06223.x

We discuss the recent discovery by Oppenheimer et al (2001) of old, cool white dwarf stars, which may be the first direct detection of Galactic halo dark matter. We argue here that the contribution of more mundane white dwarfs of the stellar halo and thick disk would contribute sufficiently to explain the new high velocity white dwarfs without invoking putative white dwarfs of the dark halo. This by no means rules out that the dark matter has been found, but it does constrain the overall contribution by white dwarfs brighter than M_V ~ 16 to significantly less than 1% of the Galactic dark matter. This work confirms a similar study by Reyle et al (2001).

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