Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization and kinematics in Cygnus A   From optical spectropolarimetry of Cygnus A we conclude that the scattering
medium in the ionization cones in Cygnus A is moving outward at a speed of
170+-34 km/s, and that the required momentum can be supplied by the radiation
pressure of an average quasar. Such a process could produce a structure
resembling the observed ionization cones, which are thought to result from
shadowing by a circumnuclear dust torus. We detect a polarized red wing in the
[O III] emission lines arising from the central kiloparsec of Cygnus A. This
wing is consistent with line emission created close to the boundary of the
broad-line region.

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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
13
The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
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The categories of this paper are: stat