Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ionized Gas Kinematics at High Resolution IV: Star Formation and a
  Rotating Core in the Medusa (NGC 4194)   NGC 4194 is a post-merger starburst known as The Medusa for its striking
tidal features. We present here a detailed study of the structure and
kinematics of ionized gas in the central 0.65 kpc of the Medusa. The data
include radio continuum maps with resolution up to $0.18\arcsec$ (35 pc) and a
$12.8\mu$m [NeII] data cube with spectral resolution $\sim4$\kms: the first
{\it high resolution, extinction-free} observations of this remarkable object.
The ionized gas has the kinematic signature of a core in solid-body rotation.
The starburst has formed a complex of bright compact \HII~regions, probably
excited by deeply embedded super star clusters, but none of these sources is a
convincing candidate for a galactic nucleus. The nuclei of the merger partners
that created the Medusa have not yet been identified.

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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio