Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ALMA Observations of Nearby Luminous Infrared Galaxies with Various AGN
  Energetic Contributions Using Dense Gas Tracers   We present the results of our ALMA Cycle 0 observations, using HCN/HCO+/HNC
J=4-3 lines, of six nearby luminous infrared galaxies with various energetic
contributions from active galactic nuclei (AGNs) estimated from previous
infrared spectroscopy. These lines are very effective for probing the physical
properties of high-density molecular gas around the hidden energy sources in
the nuclear regions of these galaxies. We find that HCN to HCO+ J=4-3 flux
ratios tend to be higher in AGN-important galaxies than in starburst-dominated
regions, as was seen at the J=1-0 transition, while there is no clear
difference in the HCN-to-HNC J=4-3 flux ratios among observed sources. A galaxy
with a starburst-type infrared spectral shape and very large molecular line
widths shows a high HCN-to-HCO+ J=4-3 flux ratio, which could be due to
turbulence-induced heating. We propose that enhanced HCN J=4-3 emission
relative to HCO+ J=4-3 could be used to detect more energetic activity than
normal starbursts, including deeply buried AGNs, in dusty galaxy populations.

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The categories of this paper are: bayes-an
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
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The categories of this paper are: eess
16
The categories of this paper are: stat
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The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph