Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accretion Disk Evolution With Wind Infall I. General Solution and
  Application to Sgr A*   The evolution of an accretion disk can be influenced significantly by the
deposition of mass and angular momentum by an infalling Bondi-Hoyle wind. Such
a mass influx impacts the long-term behavior of the disk by providing
additional sources of viscosity and heating. In this paper, we derive and solve
the disk equations when these effects are taken into account. We present a
survey of models with various wind configurations and demonstrate that the disk
spectrum may then differ substantially from that of a standard alpha-disk. In
particular, it is likely that a wind-fed disk has a significant infrared bump
due to the deposition of energy in its outer region. We apply some of the
results of our calculations to the Galactic Center black hole candidate Sgr A*
and show that if a fossil disk is present in this source, it must have a very
low viscosity parameter (alpha<10^-4) and the Bondi-Hoyle wind must be
accreting with a very high specific angular momentum to prevent it from
circularizing in the inner disk region where its impact would be most
noticeable.

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The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph