Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deep Chandra X-ray Observations of Low Mass X-ray Binary Candidates in
  the Early-Type Galaxy NGC 4697   Chandra X-ray observations routinely resolve tens to hundreds of low-mass
X-ray binaries (LMXBs) per galaxy in nearby massive early-type galaxies. These
studies have raised important issues regarding the behavior of this population
of remnants of the once massive stars in early-type galaxies, namely the
connection between LMXBs and globular clusters (GCs) and the nature of the LMXB
luminosity function (LF). In this paper, we combine five epochs of Chandra
observations and one central field Hubble Space Telescope Advance Camera for
Surveys observation of NGC 4697, one of the nearest, optically luminous
elliptical (E6) galaxies, to probe the GC-LMXB connection and LMXB-LF down to a
detection/completeness limit of (0.6/1.4) x 10^{37} ergs/s. We detect 158
sources, present their luminosities and hardness ratios, and associate 34 LMXBs
with GCs. We confirm that GCs with higher encounter rates (\Gamma_h) and redder
colors (higher metallicity Z) are more likely to contain GCs, and find that the
expected number of LMXBs per GC is proportional to \Gamma_h^{0.79+0.18/-0.15}
Z^{0.50+0.20/-0.18}, consistent with fainter X-ray sources in Galactic GCs and
LMXBs in Virgo early-type galaxies. Approximately 11+/-2% / 8 +/-2% of GCs in
NGC 4697 contain an LMXB at the detection/completeness limit. We propose that
the larger proportion of metal-rich GCs in NGC 4697 compared to the Milky Way
explains why these fractions are much higher than those of the Milky Way at
similar luminosities. We confirm that a broken power-law is the best fit to the
LMXB-LF, although we cannot rule out a cutoff power-law, and argue that this
raises the possibility that there is no universal form for the LMXB-LF in
early-type galaxies. We find marginal evidence for different LFs of LMXBs in
GCs and the field and different spectra of GC-LMXBs and Field-LMXBs.

15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex