Halo Cold Dark Matter and Microlensing

Details Halo Cold Dark Matter and Microlensing Halo Cold Dark Matter and Microlensing

1993-12-04

arxiv.org/abs/astro-ph/9312008v1

Phys.Rev.Lett. 72 (1994) 2520-2523

Astronomy and Astrophysics

Astrophysics

11 pages Latex, 2 ps figures. FNAL-Pub-93/357-A

Scientific paper

10.1103/PhysRevLett.72.2520

There is good evidence that most of the baryons in the Universe are dark and some evidence that most of the matter in the Universe is nonbaryonic with cold dark matter (cdm) being a promising possibility. We discuss expectations for the abundance of baryons and cdm in the halo of our galaxy and locally. We show that in plausible cdm models the local density of cdm is at least $10^{-25}\gcmm3$. We also discuss what one can learn about the the local cdm density from microlensing of stars in the LMC by dark stars in the halo and, based upon a suite of reasonable two-component halo models, conclude that microlensing is not a sensitive probe of the local cdm density.

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