Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Parkes multibeam pulsar survey: VII. Timing of four millisecond
  pulsars and the underlying spin period distribution of the Galactic
  millisecond pulsar population   We present timing observations of four millisecond pulsars discovered in the
Parkes 20-cm multibeam pulsar survey of the Galactic plane. PSRs J1552-4937 and
J1843-1448 are isolated objects with spin periods of 6.28 and 5.47 ms
respectively. PSR J1727-2946 is in a 40-day binary orbit and has a spin period
of 27 ms. The 4.43-ms pulsar J1813-2621 is in a circular 8.16-day binary orbit
around a low-mass companion star with a minimum companion mass of 0.2 solar
masses. Combining these results with detections from five other Parkes
multibeam surveys, gives a well-defined sample of 56 pulsars with spin periods
below 20 ms. We develop a likelihood analysis to constrain the functional form
which best describes the underlying distribution of spin periods for
millisecond pulsars. The best results were obtained with a log-normal
distribution. A gamma distribution is less favoured, but still compatible with
the observations. Uniform, power-law and Gaussian distributions are found to be
inconsistent with the data. Galactic millisecond pulsars being found by current
surveys appear to be in agreement with a log-normal distribution which allows
for the existence of pulsars with periods below 1.5 ms.

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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys