Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A {\it Chandra} Survey of Milky Way Globular Clusters I: Emissivity and
  Abundance of Weak X-ray Sources   Based on archival {\it Chandra} data, we have carried out an X-ray survey of
69, or nearly half the known population of, Milky Way globular clusters (GCs),
focusing on weak X-ray sources, mainly cataclysmic variables (CVs) and
coronally active binaries (ABs). Using the cumulative X-ray luminosity per unit
stellar mass (i.e., X-ray emissivity) as a proxy of the source abundance, we
demonstrate a paucity (lower by $41\%\pm27\%$ on average) of weak X-ray sources
in most GCs relative to the field, which is represented by the Solar
neighborhood and Local Group dwarf elliptical galaxies. We also revisit the
mutual correlations among the cumulative X-ray luminosity ($L_X$), cluster mass
($M$) and stellar encounter rate ($\Gamma$), finding $L_{X}\propto M^{0.74\pm
0.13}$, $L_{X}\propto\Gamma^{0.67\pm0.07}$ and $\Gamma \propto M^{1.28 \pm
0.17}$. The three quantities can further be expressed as $L_{X} \propto
M^{0.64\pm0.12}\ \Gamma^{0.19 \pm0.07}$, which indicates that the dynamical
formation of CVs and ABs through stellar encounters in GCs is less dominant
than previously suggested, and that the primordial formation channel has a
substantial contribution. Taking these aspects together, we suggest that a
large fraction of primordial, soft binaries have been disrupted in
binary-single or binary-binary stellar interactions before they can otherwise
evolve into X-ray-emitting close binaries, whereas the same interactions also
have led to the formation of new close binaries. No significant correlations
between $L_{X}/L_{K}$ and cluster properties, including dynamical age,
metallicity and structural parameters, are found.

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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph