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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The parkes multibeam pulsar survey - VI. Discovery and timing of 142 pulsars and a galactic population analysis
Monthly Notices of the Royal Astronomical Society, Volume 372, No. 2, Year 2006
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Description
We present the discovery and follow-up observations of 142 pulsars found in the Parkes 20-cm multibeam pulsar survey of the Galactic plane. These new discoveries bring the total number of pulsars found by the survey to 742. In addition to tabulating spin and astrometric parameters, along with pulse width and flux density information, we present orbital characteristics for 13 binary pulsars which form part of the new sample. Combining these results from another recent Parkes multibeam survey at high Galactic latitudes, we have a sample of 1008 normal pulsars which we use to carry out a determination of their Galactic distribution and birth rate. We infer a total Galactic population of 30 000 ± 1100 potentially detectable pulsars (i.e. those beaming towards us) having 1.4-GHz luminosities above 0.1 mJy kpc2. Adopting the Tauris & Manchester beaming model, this translates to a total of 155 000 ± 6000 active radio pulsars in the Galaxy above this luminosity limit. Using a pulsar current analysis, we derive the birth rate of this population to be 1.4 ± 0.2 pulsars per century. An important conclusion from our work is that the inferred radial density function of pulsars depends strongly on the assumed distribution of free electrons in the Galaxy. As a result, any analyses using the most recent electron model of Cordes & Lazio predict a dearth of pulsars in the inner Galaxy. We show that this model can also bias the inferred pulsar scaleheight with respect to the Galactic plane. Combining our results with other Parkes multibeam surveys we find that the population is best described by an exponential distribution with a scaleheight of 330 pc. Surveys underway at Parkes and Arecibo are expected to improve the knowledge of the radial distribution outside the solar circle, and to discover several hundred new pulsars in the inner Galaxy. © 2006 RAS.
Authors & Co-Authors
Lorimer, Duncan R.
United Kingdom, Manchester
The University of Manchester
United States, Morgantown
West Virginia University
Faulkner, Andrew J.
United Kingdom, Manchester
The University of Manchester
Lyne, Andrew G.
United Kingdom, Manchester
The University of Manchester
Manchester, Richard N.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Kramer, Michael
United Kingdom, Manchester
The University of Manchester
McLaughlin, Maura Ann
United Kingdom, Manchester
The University of Manchester
United States, Morgantown
West Virginia University
Hobbs, George B.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Possenti, Andrea
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Stairs, Ingrid H.
Canada, Vancouver
The University of British Columbia
Camilo, Fernando
United States, New York
Columbia University
Burgay, Marta
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
D'Amico, Nicolò D.
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Italy, Cagliari
Università Degli Studi Di Cagliari
Corongiu, Alessandro
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Crawford, Fronefield M.
United States, Lancaster
Franklin and Marshall College, Lancaster
Statistics
Citations: 410
Authors: 14
Affiliations: 8
Identifiers
Doi:
10.1111/j.1365-2966.2006.10887.x
ISSN:
00358711
Study Design
Cross Sectional Study
Cohort Study
Study Approach
Quantitative