Open AccessWhite dwarfs and Galactic dark matter
Author(s) -
Flynn Chris,
Holopainen Janne,
Holmberg Johan
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06223.x
Subject(s) - physics , white dwarf , astrophysics , dark matter halo , massive compact halo object , dark matter , black dwarf , baryonic dark matter , galactic halo , astronomy , halo , blue dwarf , stars , galaxy
We discuss the recent discovery by Oppenheimer et al. 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 disc 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 dark matter has been found, but it does constrain the overall contribution by white dwarfs brighter than M R ≈ 16 to significantly less than 1 per cent of the Galactic dark matter. This work confirms a similar study by Reylé, Robin & Crézé.