Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Millimeter Wave Observations of the Core-Jet and Molecular Gas in the FR
  I Radio Galaxy NGC 3801   We present BIMA 3 mm observations of the radio continuum source and the
molecular gas disk in the radio loud Fanaroff & Riley Type I (FR I)galaxy
NGC3801.We have detected a continuum source in the nucleus and determined that
it has a flat millimeter-wave spectrum, suggesting that the emission is
non-thermal and due to an AGN; the radio core is not evident in existing VLA
observations. We also map the extended 3 mm emission from the previously known
radio jets. In addition, we detect CO (1--0) emission associated with the dust
disk observed in previous HST images. A velocity gradient is observed,
indicating a two kpc radius rotating gas ring or disk oriented roughly
perpendicular to the radio jets. The inferred molecular gas mass of the disk is
$M(H_{2})=3\times10^{8}M_{\odot}$, about 1% of the dynamical mass. We also find
a $\sim 10^8$ M$_\odot$ molecular gas clump not associated with the gas disk.
There is evidence that this gas is associated with a merger and is infalling.
This suggests that FR I type activity is related to merger activity, as is
thought to be the case for FR II type radio galaxies. We also find indications
that one of the radio jets is entraining gas from the infalling molecular gas.

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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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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: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: bayes-an