Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Imaging the Molecular Gas in a z=3.9 Quasar Host Galaxy at 0.3"
  Resolution: A Central, Sub-Kiloparsec Scale Star Formation Reservoir in APM
  08279+5255   We have mapped the molecular gas content in the host galaxy of the strongly
lensed high redshift quasar APM 08279+5255 (z=3.911) with the Very Large Array
at 0.3" resolution. The CO(J=1-0) emission is clearly resolved in our maps. The
CO(J=1-0) line luminosity derived from these maps is in good agreement with a
previous single-dish measurement. In contrast to previous interferometer-based
studies, we find that the full molecular gas reservoir is situated in two
compact peaks separated by <~0.4". Our observations reveal, for the first time,
that the emission from cold molecular gas is virtually cospatial with the
optical/near-infrared continuum emission of the central AGN in this source.
This striking similarity in morphology indicates that the molecular gas is
situated in a compact region close to the AGN. Based on the high resolution CO
maps, we present a revised model for the gravitational lensing in this system,
which indicates that the molecular gas emission is magnified by only a factor
of 4 (in contrast to previously suggested factors of 100). This model suggests
that the CO is situated in a circumnuclear disk of ~550 pc radius that is
possibly seen at an inclination of <~25 deg, i.e., relatively close to face-on.
  From the CO luminosity, we derive a molecular gas mass of M_gas=1.3x10^11
M_sun for this galaxy. From the CO structure and linewidth, we derive a
dynamical mass of M_dyn(sin i)^2=4.0x10^10 M_sun. Based on a revised mass
estimate for the central black hole of M_BH=2.3x10^10 M_sun and the results of
our molecular line study, we find that the mass of the stellar bulge of APM
08279+5255 falls short of the local M_BH-sigma_bulge relationship of nearby
galaxies by more than an order of magnitude, lending support to recent
suggestions that this relation may evolve with cosmic time and/or change toward
the high mass end.

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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg