Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Circumnuclear Molecular Gas in Megamaser Disk Galaxies NGC 4388 and NGC
  1194   We explore the warm molecular and ionized gas in the centers of two megamaser
disk galaxies using K-band spectroscopy. Our ultimate goal is to determine how
gas is funneled onto the accretion disk, here traced by megamaser spots on
sub-pc scales. We present NIR IFU data with a resolution of ~50 pc for two
galaxies: NGC 4388 with VLT/SINFONI and NGC 1194 with Keck/OSIRIS+AO. The high
spatial resolution and rich spectral diagnostics allow us to study both the
stellar and gas kinematics as well as gas excitation on scales only an order of
magnitude larger than the maser disk. We find a drop in the stellar velocity
dispersion in the inner ~100 pc of NGC 4388, a common signature of a
dynamically cold central component seen in many active nuclei. We also see
evidence for non-circular gas motions in the molecular hydrogen on similar
scales, with the gas kinematics on 100-pc scales aligned with the megamaser
disk. In contrast, the high ionization lines and Br-gamma trace outflow along
the 100 pc-scale jet. In NGC 1194, the continuum from the accreting black hole
is very strong, making it difficult to measure robust two-dimensional
kinematics, but the spatial distribution and line ratios of the molecular
hydrogen and Br-gamma have consistent properties between the two galaxies.

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The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph