Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-14
Phys.Rev.D77:064023,2008
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures. Accepted for publication in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.77.064023
The relativistic accretion rate of dark matter by a black hole is revisited. Under the assumption that the phase space density indicator, $Q=\rho_{\infty}/\sigma^3_{\infty}$, remains constant during the inflow, the derived accretion rate can be higher up to five orders of magnitude than the classical accretion formula, valid for non-relativistic and non-interacting particles, when typical dark halo conditions are considered. For these typical conditions, the critical point of the flow is located at distances of about 30-150 times the horizon radius. Application of our results to black hole seeds hosted by halos issued from cosmological simulations indicate that dark matter contributes to no more than ~10% of the total accreted mass, confirming that the bolometric quasar luminosity is related to the baryonic accretion history of the black hole.
de Freitas Pacheco José Antonio
Peirani Sébastien
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