Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-02
Mon.Not.Roy.Astron.Soc.399:1347-1356,2009
Astronomy and Astrophysics
Astrophysics
16 pages, 2 figures. v2: refereed version
Scientific paper
10.1111/j.1365-2966.2009.15367.x
If the cosmological dark matter has a component made of small primordial black holes, they may have a significant impact on the physics of the first stars and on the subsequent formation of massive black holes. Primordial black holes would be adiabatically contracted into these stars and then would sink to the stellar center by dynamical friction, creating a larger black hole which may quickly swallow the whole star. If these primordial black holes are heavier than $\sim 10^{22} {\rm g}$, the first stars would likely live only for a very short time and would not contribute much to the reionization of the universe. They would instead become $10 - 10^3 M_\odot$ black holes which (depending on subsequent accretion) could serve as seeds for the super--massive black holes seen at high redshifts as well as those inside galaxies today.
Bambi Cosimo
Dolgov Alexander. D.
Freese Katherine
Spolyar Douglas
Volonteri Marta
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