Physics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996el.....33..327m&link_type=abstract
Europhysics Letters, Volume 33, Issue 4, pp. 327-332 (1996).
Physics
18
Dark Matter, Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Galactic Halo
Scientific paper
We use recently observed luminosity functions of halo M-dwarfs and an accurate mass-luminosity relationship to derive the mass function of Pop II low-mass stars in the galactic spheroid. All these luminosity functions yield rising mass functions near the hydrogen-burning limit (with α approx 2). Connecting the microlensing and star count constraints, we show that the mass function in the dark halo steepens significantly (α gtrsim 4). The minimum mass is found to be minf approx 0.02Modot, which corresponds to an average mass bar m approx 0.03Modot, strongly suggesting that the dark objects responsible for the microlensing events are genuine brown dwarfs. We determine the expected spheroid and halo brown-dwarf density in the solar neighbourhood. The mass fraction under the form of substellar objects in the halo of the Galaxy is likely to represent only 5 to 15 % of the total dynamic mass.
Chabrier Gilles
Méra Dominique
Schaeffer Richard
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