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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Discovery of millisecond pulsars in radio searches of southern Fermi Large Area Telescope sources
Monthly Notices of the Royal Astronomical Society, Volume 414, No. 2, Year 2011
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Description
Using the Parkes Radio Telescope, we have carried out deep observations of 11 unassociated gamma-ray sources. Periodicity searches of these data have discovered two millisecond pulsars, PSRJ1103-5403 (1FGLJ1103.9-5355) and PSRJ2241-5236 (1FGLJ2241.9-5236), and a long-period pulsar, PSRJ1604-44 (1FGLJ1604.7-4443). In addition, we searched for but did not detect any radio pulsations from six gamma-ray pulsars discovered by the Fermi satellite to a level of ∼0.04mJy (for pulsars with a 10 per cent duty cycle). The timing of the millisecond pulsar PSRJ1103-5403 has shown that its position is 9 arcmin from the centroid of the gamma-ray source. Since these observations were carried out, independent evidence has shown that 1FGLJ1103.9-5355 is associated with the flat spectrum radio source PKS1101-536. It appears certain that the pulsar is not associated with the gamma-ray source, despite the seemingly low probability of a chance detection of a radio millisecond pulsar. We consider that PSRJ1604-44 is a chance discovery of a weak, long-period pulsar and is unlikely to be associated with 1FGLJ1604.7-4443. PSRJ2241-5236 has a spin period of 2.2ms and orbits a very low mass companion with a 3.5-h orbital period. The relatively high flux density and low dispersion measure of PSRJ2241-5236 make it an excellent candidate for high precision timing experiments. The gamma rays of 1FGLJ2241.9-5236 have a spectrum that is well modelled by a power law with an exponential cut-off, and phase binning with the radio ephemeris results in a multipeaked gamma-ray pulse profile. Observations with Chandra have identified a coincident X-ray source within 0.1 arcsec of the position of the pulsar obtained by radio timing. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Authors & Co-Authors
Keith, Michael J.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Johnston, Simon
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Ray, Paul S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Ferrara, Elizabeth C.
United States, Greenbelt
Nasa Goddard Space Flight Center
Saz-Parkinson, Pablo M.
United States, Santa Cruz
University of California, Santa Cruz
Çelik, Ö. Ö.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, Baltimore
University of Maryland, Baltimore County Umbc
Belfiore, Andrea
United States, Santa Cruz
University of California, Santa Cruz
Italy, Milan
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Milan
Italy, Pavia
Università Degli Studi Di Pavia
Donato, Davide
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Cheung, Chi C.Teddy
United States, Washington, D.c.
National Academy of Sciences
Abdo, Aous A.
United States, Washington, D.c.
National Academy of Sciences
Camilo, Fernando
United States, New York
Columbia University
Freire, Paulo C.C.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Guillemot, Lucas
Germany, Bonn
Max Planck Institute for Radio Astronomy
Harding, Alice K.
United States, Greenbelt
Nasa Goddard Space Flight Center
Kramer, Michael
Germany, Bonn
Max Planck Institute for Radio Astronomy
United Kingdom, Manchester
The University of Manchester
Michelson, Peter F.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Ransom, Scott M.
United States, Charlottesville
National Radio Astronomy Observatory
Romani, Roger W.R.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Smith, David A.
France, Bordeaux
Université de Bordeaux
Thompson, David J.
United States, Greenbelt
Nasa Goddard Space Flight Center
Weltevrede, Patrick
United Kingdom, Manchester
The University of Manchester
Wood, Kent S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Statistics
Citations: 80
Authors: 22
Affiliations: 15
Identifiers
Doi:
10.1111/j.1365-2966.2011.18464.x
ISSN:
00358711