Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How Dim Accreting Black Holes Could Be?   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>100R_g. In such flows, the radiative output comes mostly
from the convection part, and the radiative efficiency is independent of
accretion rate and equals ~0.001. 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 by factor
about 100 dimmer that neutron stars accreting with the same accretion rates.

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: eess