Journal Article

A 6.5-GHz multibeam pulsar survey

S. D. Bates, S. Johnston, D. R. Lorimer, M. Kramer, A. Possenti, M. Burgay, B. Stappers, M. J. Keith, A. Lyne, M. Bailes, M. A. McLaughlin, J. T. O'Brien and G. Hobbs

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 3, pages 1575-1584
Published in print March 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI:
A 6.5-GHz multibeam pulsar survey

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A survey of the Galactic plane in the region −60°≤l≤ 30°, |b| ≤ 0°.25 was carried out using the seven-beam Parkes methanol multibeam (MMB) receiver, which operates at a frequency of 6.5 GHz. Three pulsars were discovered and 16 previously known pulsars detected. In this paper we present two previously unpublished discoveries, both with extremely high dispersion measures, one of which is very close, in angular distance, to the Galactic Centre. The survey data also contain the first known detection, at radio frequencies, of the radio magnetar PSR J1550−5418. Our survey observation was made 46 d prior to that previously published and places constraints on the beginning of pulsed radio emission from the source.

The detection of only three previously undiscovered pulsars argues that there are few pulsars in the direction of the inner Galaxy whose flux density spectrum is governed by a flat power law. However, these pulsars would be likely to remain undetected at lower frequencies due to the large amount of scatter broadening which affects pulsars with high values of dispersion measure. Surveys with future telescopes at high observing frequencies will therefore play an important role in the discovery of pulsars at the Galactic Centre. By simulating pulsar surveys of the Galaxy with phase-1 Square Kilometer Array at frequencies of 1.4 and 10 GHz, we find that high-frequency observations are the only way to discover and observe the Galactic-Centre pulsar population.

Keywords: stars: neutron; pulsars: general; pulsars: individual: PSR J1834–0812; pulsars: individual: PSR J1746–2850

Journal Article.  6874 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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