Brown dwarfs as dark galactic halos

Details Brown dwarfs as dark galactic halos Brown dwarfs as dark galactic halos

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359...57a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 57-62.

Astronomy and Astrophysics

Astrophysics

30

Brown Dwarf Stars, Dark Matter, Galactic Structure, Halos, Stellar Evolution, Baryons, Molecular Clouds, Near Infrared Radiation, Satellite Observation, Spiral Galaxies

Scientific paper

The possibility that the dark matter in galactic halos can consist of brown dwarf stars is considered. The radiative signature for such halos consisting solely of brown dwarfs is calculated, and the allowed range of brown dwarf masses, the initial mass function (IMF), the stellar properties, and the density distribution of the galactic halo are discussed. The prediction emission from the halo is compared with existing observations. It is found that, for any IMF of brown dwarfs below the deuterium burning limit, brown dwarf halos are consistent with observations. Brown dwarf halos cannot, however, explain the recently observed near-IR background. It is shown that future satellite missions will either detect brown dwarf halos or place tight constraints on the allowed range of the IMF.

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