How Dim Could Accreting Black Holes Be?

Details How Dim Could Accreting Black Holes Be? How Dim Could Accreting Black Holes Be?

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...554l..53a&link_type=abstract

The Astrophysical Journal, Volume 554, Issue 1, pp. L53-L54.

Physics

13

Accretion, Accretion Disks, Black Hole Physics, Convection

Scientific paper

Recent hydrodynamical simulations of radiatively inefficient black hole accretion flows with low viscosity have demonstrated that these flows differ significantly from those described by an advection-dominated model. The black hole flows are advection-dominated only in their inner parts but convectively dominated at radii R>~102RG. In such flows, the radiative output comes mostly from the convection part, and the radiative efficiency is independent of accretion rate and equals ɛBH~=10-3. This value gives a limit for how dim an accreting black hole could be. It agrees with recent Chandra observations, which indicate that accreting black holes in low-mass X-ray binaries are dimmer by a factor of about 100 than neutron stars accreting with the same accretion rates.

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