Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic Radiation Hydrodynamical Accretion Disk Winds   Accretion disk winds browing off perpendicular to a luminous disk are
examined in the framework of fully special relativistic radiation
hydrodynamics. The wind is assumed to be steady, vertical, and isothermal. %and
the gravitational fields is approximated by a pseudo-Newtonian potential. Using
a velocity-dependent variable Eddington factor, we can solve the rigorous
equations of relativistic radiative hydrodynamics, and can obtain radiatively
driven winds accelerated up to the {\it relativistic} speed. For less luminous
cases, disk winds are transonic types passing through saddle type critical
points, and the final speed of winds increases as the disk flux and/or the
isothermal sound speed increase. For luminous cases, on the other hand, disk
winds are always supersonic, since critical points disappear due to the
characteristic nature of the disk gravitational fields. The boundary between
the transonic and supersonic types is located at around $\hat{F}_{\rm c} \sim
0.1 (\epsilon+p)/(\rho c^2)/\gamma_{\rm c}$, where $\hat{F}_{\rm c}$ is the
radiative flux at the critical point normalized by the local Eddington
luminosity, $(\epsilon+p)/(\rho c^2)$ is the enthalpy of the gas divided by the
rest mass energy, and $\gamma_{\rm c}$ is the Lorentz factor of the wind
velocity at the critical point. In the transonic winds, the final speed becomes
0.4--0.8$c$ for typical parameters, while it can reach $\sim c$ in the
supersonic winds.

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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas