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TOPIC: Parkes multibeam survey

Blobrana

L

Posts: 131433

Date: Jan 23 15:48 2015

Parkes multibeam pulsar survey	Permalink

Title: The Parkes multibeam pulsar survey: VII. Timing of four millisecond pulsars and the underlying spin period distribution of the Galactic millisecond pulsar population Author: D.R. Lorimer, P. Esposito, R.N. Manchester, A. Possenti, A.G. Lyne, M.A. McLaughlin, M. Kramer, G. Hobbs, I. H. Stairs, M. Burgay, R.P. Eatough, M.J. Keith, A.J. Faulkner, N. D'Amico, F. Camilo, A. Corongiu, F. Crawford 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. Read more (91kb, PDF) __________________

Blobrana

L

Posts: 131433

Date: Jun 8 03:36 2013

Parkes multibeam survey	Permalink

Title: Timing of pulsars found in a deep Parkes multibeam survey Authors: D.R. Lorimer, F. Camilo, M.A. McLaughlin We have carried out a sensitive radio pulsar survey along the northern Galactic plane (50° < l < 60° and \|b\| \lapp 2°) using the Parkes 20-cm multibeam system. We observed each position for 70-min on two separate epochs. Our analyses to date have so far resulted in the detection of 32 pulsars, of which 17 were previously unknown. Here we summarise the observations and analysis and present the timing observations of 11 pulsars and discovery parameters for a further 6 pulsars. We also present a timing solution for the 166-ms bursting pulsar, PSR~J1938+2213, previously discovered during an Arecibo drift-scan survey. Our survey data for this pulsar show that the emission can be described by a steady pulse component with bursting emission, which lasts for typically 20--25 pulse periods, superposed. Other new discoveries are the young 80.1-ms pulsar PSR~J1935+2025 which exhibits a significant amount of unmodelled low-frequency noise in its timing residuals, and the 4.2-ms pulsar PSR~J1935+1726 which is in a low-mass binary system with a 90.7-day circular orbit. Read more (751kb, PDF) __________________

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