Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular Gas and Dust at z = 2.6 in SMM J14011+0252: A Strongly Lensed,
  Ultraluminous Galaxy, Not a Huge, Massive Disk   We used the IRAM Interferometer to detect CO(3-2), CO(7-6), and 1.3 mm dust
continuum emission from the submillimeter galaxy SMM J14011+0252 at a redshift
of 2.6. Contrary to a recent claim that the CO was extended over 6.6 arcsec (57
kpc), the new data yield a size of 2 x 0.5 arcsec for the CO and the dust.
Although previous results placed the CO peak in a region with no visible
counterpart, the new maps show the CO and dust are centered on the J1 complex
seen on K-band and optical images. We suggest the CO is gravitationally lensed
not only by the foreground cluster A1835, but also by an individual galaxy on
the line of sight. Comparison of measured and intrinsic CO brightness
temperatures indicates the CO size is magnified by a factor of 25 +/- 5. After
correcting for lensing, we derive a true CO diameter of ~0.08 arcsec (700 pc),
consistent with a compact circumnuclear disk of warm molecular gas similar to
that in Arp 220. The high magnification means the true size, far-IR luminosity,
star formation rate, CO luminosity, and molecular gas mass are all comparable
with those in present-epoch ultraluminous IR galaxies, not with those of a
huge, massive, early-universe galactic disk.

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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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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: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas