What are Machos? Limits on Stellar Objects as the Dark Matter of our Halo

Details What are Machos? Limits on Stellar Objects as the Dark Matter of our Halo What are Machos? Limits on Stellar Objects as the Dark Matter of our Halo

1999-01-13

arxiv.org/abs/astro-ph/9901178v1

conference proceedings,International Workshop on Aspects of Dark Matter in Astro and Particle Physics, Heidelberg, Germany, Ju

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures

Scientific paper

The nature of the Massive Compact Halo objects seen in microlensing experiments and interpreted as dark matter in the Halo of our Galaxy remains a mystery. Arguments are presented that these events are probably not ordinary stellar or substellar objects, i.e., they are probably not faint stars, brown dwarfs, white dwarfs, or neutron stars. On theoretical grounds one is then pushed to either exotic explanations or a "no-Macho" Halo (in which the Machos reside elsewhere than in the Halo). Indeed a nonbaryonic component in the Halo seems to be required.

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