Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tidal Disruption Eddington Envelopes around Massive Black Holes   Optically-thick envelopes may form following the tidal disruption of a star
by a massive black hole. Such envelopes would reprocess hard radiation from
accretion close to the black hole into the UV and optical bands producing
AGN-luminosity flares with duration ~1 year. We show that due to relativistic
effects, the envelopes are convective. If convection is efficient, then the
structure of the envelopes is similar to that described in previous work;
however, the photospheric radius is shown to be very sensitive to the
luminosity at the envelope base, suggesting that either the envelope collapses
or the envelope expands to a maximum radius at which point a wind may set in.
For an envelope without winds, we find a maximum photospheric radius of ~10^16
cm (i.e. minimum effective temperature ~6,000 K). The evolution of the
envelopes is described based on simple energy arguments.

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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: comp-gas