A Scenario for a Baryonic Dark Halo

Details A Scenario for a Baryonic Dark Halo A Scenario for a Baryonic Dark Halo

1994-11-04

arxiv.org/abs/astro-ph/9411018v1

Astron.Astrophys.295:567,1995

Astronomy and Astrophysics

Astrophysics

10 pages, latex, accepted in Astronomy and Astrophysics

Scientific paper

The recent observations of microlensing events in the LMC by the MACHO and EROS collaborations suggest that an important fraction of the galactic halo is in the form of Massive Halo Objects (MHO) of about 0.1 M_{\odot}. Here, we argue that the galactic halo is mainly baryonic and that besides MHO also H_2 molecular clouds may significantly contribute to it. We propose a scenario in which dark clusters of MHO and/or H_2 molecular clouds form in the halo at galactocentric distances larger than ~ 10-20 kpc, since there we expect less collisions among proto globular cluster clouds and a smaller UV radiation flux. Cosmic ray protons may induce a significant gamma-ray flux in H_2 molecular clouds. Our calculation gives an upper bound to this flux which is below present detectability.

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