Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Radio Emission of the Seyfert Galaxy NGC 7319   We present VLA maps of the Seyfert 2 galaxy NGC 7319 at 3.6, 6, and 20 cm.
Sub-arcsecond resolution is achieved at 3.6 and 6 cm. The radio emission
exhibits a triple structure on a scale of ~4'' (1.7 kpc). All three components
have steep spectra, consistent with synchrotron radiation. We have also
analyzed an HST archival, broad-band red image, which contains structure
related to the radio components. In particular, a V-shaped feature in the HST
image some 3.7'' (1.6 kpc) southwest of the nucleus is associated with highly
blueshifted emission lines seen in ground-based spectra. We interpret the
V-shaped feature as emission from gas compressed by the bow shock driven by the
outwardly moving radio plasmoid.

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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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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: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex