Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron scattering wings on lines in interacting supernovae   We consider the effect of electron scattering on lines emitted as a result of
supernova interaction with a circumstellar medium, assuming that the scattering
occurs in ionized gas in the preshock circumstellar medium. The single
scattering case gives the broad component in the limit of low optical depth,
showing a velocity full width half maximum that is close to the thermal
velocities of electrons. The line shape is approximately exponential at low
velocities and steepens at higher velocities. At higher optical depths, the
line profile remains exponential at low velocities, but wings strengthen with
increasing optical depth. In addition to the line width, the ratio of narrow to
broad (scattered) line strength is a possible diagnostic of the gas. The
results depend on the density profile of the circumstellar gas, especially if
the scattering and photon creation occur in different regions. We apply the
scattering model to a number of supernovae, including Type IIn and Type Ia-CSM
events. The asymmetry to the red found in some cases can be explained by
scattering in a fast wind region which is indicated by observations.

12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an