Neutron Stars and Black Holes as MACHOs

Details Neutron Stars and Black Holes as MACHOs Neutron Stars and Black Holes as MACHOs

1997-05-12

arxiv.org/abs/astro-ph/9705091v3

Astrophys.J. 516 (1999) 863

Astronomy and Astrophysics

Astrophysics

23 pages (LaTex), including 2 figures; final version, to appear in The Astrophysical Journal, May 10, 1999 issue

Scientific paper

10.1086/307120

We consider the contribution of neutron stars and black holes to the dynamical mass of galactic halos. In particular, we show that if these compact objects were produced by an early generation of stars with initial metallicity less than about $10^{-4} Z_\odot$, they can contribute at most 30--40% of the Galactic halo mass without creating supersolar levels of enrichment. We show that the case for halo neutron stars and black holes cannot be rejected on metal overproduction arguments alone, due to the critical factor of the choice of progenitor metallicity in determining the yields. We show that this scenario satisfies observational constraints, similar to but no more severe than those faced by halo white dwarfs. We also discuss the recent results on halo microlensing, the presence of enriched hot gas in clusters and groups of galaxies, and other observations. If there are halo neutron stars and black holes, they will be detected by microlensing experiments in the future as longer-timescale events.

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