Gravitational microlensing and dark matter in the galactic halo

Details Gravitational microlensing and dark matter in the galactic halo Gravitational microlensing and dark matter in the galactic halo

1999-01-06

arxiv.org/abs/astro-ph/9901058v2

AIPConf.Proc.476:135-148,1999

Astronomy and Astrophysics

Astrophysics

14 pages, to appear in the proceedings of the 3K Cosmology Conference (Rome, october 1998), added references and minor changes

Scientific paper

10.1063/1.59348

We present the basics of microlensing and give an overview of the results obtained so far. We also describe a scenario in which dark clusters of MACHOs (Massive Astrophysical Compact Halo Objects) and cold molecular clouds (mainly of $H_2$) naturally form in the halo at galactocentric distances larger than 10-20 kpc. Moreover, we discuss various experimental tests of this picture in particular a $\gamma$-ray emission from the clouds due to the scattering of high-energy cosmic-ray protons. Our estimate for the $\gamma$-ray flux turns out to be in remarkably good agreement with the recent discovery by Dixon et al. of a possible $\gamma$-ray emission from the halo using EGRET data.

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