Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for multiwavelength emission from the binary millisecond pulsar
  PSR J1836-2354A in the globular cluster M22   We present a multi-band search for X-ray, optical and $\gamma$-ray emission
of the radio binary millisecond pulsar J1836-2354A, hosted in the globular
cluster M22. X-ray emission is significantly detected in two Chandra
observations, performed in 2005 and 2014, at a luminosity of
$\sim$2-3$\times$10$^{30}$ erg s$^{-1}$, in the 0.5-8 keV energy range. The
radio and the X-ray source positions are found consistent within 1$\sigma$
error box. No detection is found in archival XMM-Newton and Swift/XRT
observations, compatible with the Chandra flux level. The low statistics
prevents us to assess if the X-ray source varied between the two observations.
The X-ray spectrum is consistent with a power-law of photon index $\sim$1.5. We
favour as the most probable origin of the X-ray emission an intrabinary shock
scenario. We searched for optical and $\gamma$-ray counterparts to the radio
source using data from Hubble Space Telescope and Fermi-LAT catalogues,
respectively. No optical counterpart down to V=25.9 and I=24.7 (3$\sigma$) is
detected, which suggests a companion mass of 0.1-0.2 $M_\odot$. Combined with
the low X-ray luminosity, this is consistent with a black widow nature of PSR
J1636-2354A. Inspecting the 8-year Fermi-LAT catalogue, we found a $\gamma$-ray
source, 4FGL J1836.8-2354, with a positional uncertainty consistent with the
globular cluster, but not with the radio position of the millisecond pulsar.

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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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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: mtrl-th