Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Giant Molecular Cloud Catalog in the Molecular Disk of the Elliptical
  Galaxy NGC 5128 (Centaurus A)   We present the first census of giant molecular clouds (GMCs) complete down to
10$^6 M_{\odot}$ and within the inner 4 kpc of the nearest giant elliptical and
powerful radio galaxy, Centaurus A.
  We identified 689 GMCs using CO(1--0) data with 1" spatial resolution ($\sim
20$ pc) and 2 km/s velocity resolution obtained with the Atacama Large
Millimeter/submillimeter Array (ALMA).
  The $I$(CO)-$N$(H$_2$) conversion factor based on the virial method is
$X_{\rm CO}$ = $(2 \pm 1 )\times10^{20}$ cm$^{-2}$(K km/s)$^{-1}$ for the
entire molecular disk, consistent with that of the disks of spiral galaxies
including the Milky Way, and $X_{\rm CO}$ = $(5 \pm 2)\times10^{20}$
cm$^{-2}$(K km/s)$^{-1}$ for the circumnuclear disk (CND, within a
galactocentric radius of 200 pc).
  We obtained the GMC mass spectrum distribution and find that the
best-truncated power-law fit for the whole molecular disk, with index $\gamma
\simeq -2.41 \pm 0.02$ and upper cutoff mass $\sim 1.3 \times 10^{7}
M_{\odot}$, is also in agreement with that of nearby disk galaxies. A trend is
found in the mass spectrum index from steep to shallow as we move to inner
radii.
  Although the GMCs are in an elliptical galaxy, the general GMC properties in
the molecular disk are as in spiral galaxies. However, in the CND, large
offsets in the line-width-size scaling relations ($\sim$ 0.3 dex higher than
those in the GMCs in the molecular disk), a different $X_{\rm CO}$ factor, and
the shallowest GMC mass distribution shape ($\gamma = -1.1 \pm 0.2$) all
suggest that there the GMCs are most strongly affected by the presence of the
AGN and/or shear motions.

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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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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: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th