Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Identification of the High-Energy Gamma-Ray Source 3FGL J1544.6-1125 as
  a Transitional Millisecond Pulsar Binary in an Accreting State   We present X-ray, ultraviolet, and optical observations of 1RXS
J154439.4-112820, the most probable counterpart of the unassociated Fermi LAT
source 3FGL J1544.6-1125. The optical data reveal rapid variability, which is a
feature of accreting systems. The X-rays exhibit large-amplitude variations in
the form of fast switching (within ~10 s) between two distinct flux levels that
differ by a factor of $\approx$10. The detailed optical and X-ray behavior is
virtually identical to that seen in the accretion-disk-dominated states of the
transitional millisecond pulsar binaries PSR J1023+0038 and XSS J12270-4859,
which are also associated with $\gamma$-ray sources. Based on the available
observational evidence, we conclude that 1RXS J154439.4-112820 and 3FGL
J1544.6-1125 are the same object, with the X-rays arising from intermittent
low-luminosity accretion onto a millisecond pulsar and the $\gamma$-rays
originating from an accretion-driven outflow. 1RXS J154439.4-112820 is only the
fourth $\gamma$-ray emitting low-mass X-ray binary system to be identified and
is likely to sporadically undergo transformations to a non-accreting
rotation-powered pulsar system.

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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: nlin