Halo dark clusters of brown dwarfs and molecular clouds

Details Halo dark clusters of brown dwarfs and molecular clouds Halo dark clusters of brown dwarfs and molecular clouds

1998-01-14

arxiv.org/abs/astro-ph/9801126v1

Astrophys.J.500:59,1998

Astronomy and Astrophysics

Astrophysics

Latex file. To appear in Astrophysical Journal

Scientific paper

10.1086/305692

The discovery of Massive Astrophysical Compact Halo Objects (MACHOs) in microlensing experiments makes it compelling to understand their physical nature, as well as their formation mechanism. Within the present uncertainties, brown dwarfs are a viable candidate for MACHOs, and the present paper deals with this option. According to a recently proposed scenario, brown dwarfs are clumped along with cold molecular clouds into dark clusters -- in several respects similar to globular clusters -- which form in the outer part of the galactic halo. Here, we analyze the dynamics of these dark clusters and we address the possibility that a sizable fraction of MACHOs can be binary brown dwarfs. Moreover, we point out that Ly-$\alpha$ absorption systems naturally fit within the present picture.

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