No nearby counterparts to the moving objects in the Hubble Deep Field

Details No nearby counterparts to the moving objects in the Hubble Deep Field No nearby counterparts to the moving objects in the Hubble Deep Field

1999-12-14

arxiv.org/abs/astro-ph/9912264v1

Mon.Not.Roy.Astron.Soc. 322 (2001) 553

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, MNRAS LaTeX format

Scientific paper

10.1046/j.1365-8711.2001.04082.x

Ibata et al (1999) have recently discovered faint, moving objects in the Hubble Deep Field. The quantity, magnitudes and proper motions of these objects are consistent with old white dwarfs making up the Galactic dark halo. We review a number of ground-based proper motion surveys in which nearby dark halo white dwarfs might be present, if they have the colours and absolute magnitudes proposed. No such objects have been found, whereas we argue here that several times more would be expected than in the Hubble Deep Field. We conclude it is unlikely that hydrogen atmosphere white dwarfs make up a significant fraction of the halo dark matter. No limits can be placed yet on helium atmosphere dwarfs from optical searches.

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