Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Super-Eddington Radiation Transfer in Soft Gamma Repeaters   Bursts from soft gamma repeaters have been shown to be super-Eddington by a
factor of 1000 and have been persuasively associated with compact objects.
Here, a model of super-Eddington radiation transfer on the surface of a
strongly magnetic ($\geq 10^{13}$ gauss) neutron star is studied and related to
the observational constraints on soft gamma repeaters. In strong magnetic
fields, the cross-section to electron scattering is strongly suppressed in one
polarization state, so super-Eddington fluxes can be radiated while the plasma
remains in hydrostatic equilibrium. The model offers a somewhat natural
explanation for the observation of similarity between spectra from bursts of
varying intensity. The radiation produced in the model is found to be linearly
polarized to about 1 part in 1000 in a direction determined by the local
magnetic field, and the large intensity variations between bursts are
understood as a change in the radiating area on the source. Therefore, the
polarization may vary as a function of burst intensity, since the complex
structure of the magnetic field may be more apparent for larger radiating
areas. It is shown that for radiation transfer calculations in this limit of
super-strong magnetic fields it is sufficient to solve the radiation transfer
equations for the low opacity state rather than the coupled equations for both.
With this approximation, standard stellar atmosphere techniques are utilized to
calculate the model energy spectrum.

37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
19
The categories of this paper are: eess
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci