Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Metallicity Dependence of the High-Mass X-ray Binary Luminosity
  Function   We present detailed constraints on the metallicity dependence of the high
mass X-ray binary (HMXB) X-ray luminosity function (XLF). We analyze ~5 Ms of
Chandra data for 55 actively star-forming galaxies at D < 30 Mpc with gas-phase
metallicities spanning 12 + log(O/H) = 7-9.2. Within the galactic footprints,
our sample contains a total of 1311 X-ray point sources, of which ~49% are
expected to be HMXBs, with the remaining sources likely to be low-mass X-ray
binaries (LMXBs; ~22%) and unrelated background sources (~29%). We construct a
model that successfully characterizes the average HMXB XLF over the full
metallicity range. We demonstrate that the SFR-normalized HMXB XLF shows clear
trends with metallicity, with steadily increasing numbers of luminous and
ultraluminous X-ray sources (logL(erg/s) = 38-40.5) with declining metallicity.
However, we find that the low-luminosity (logL(erg/s) = 36-38) HMXB XLF appears
to show a nearly constant SFR scaling and slope with metallicity. Our model
provides a revised scaling relation of integrated LX/SFR versus 12 + log(O/H)
and a new characterization of its the SFR-dependent stochastic scatter. The
general trend of this relation is broadly consistent with past studies based on
integrated galaxy emission; however, our model suggests that this relation is
driven primarily by the high-luminosity end of the HMXB XLF. Our results have
implications for binary population synthesis models, the nature of
super-Eddington accreting objects (e.g., ultraluminous X-ray sources), recent
efforts to identify active galactic nucleus candidates in dwarf galaxies, and
the X-ray radiation fields in the early Universe during the epoch of cosmic
heating at z > 10.

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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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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: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: math
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The categories of this paper are: stat