DISCOVERY OF PULSED gamma-RAYS FROM THE YOUNG RADIO PULSAR PSR J1028-5819 WITH THE FERMI LARGE AREA TELESCOPE
2009 (English)In: ASTROPHYSICAL JOURNAL LETTERS, ISSN 2041-8205, Vol. 695, no 1, L72-L77 p.Article in journal (Refereed) Published
Radio pulsar PSR J1028-5819 was recently discovered in a high-frequency search (at 3.1 GHz) in the error circle of the Energetic Gamma-Ray Experiment Telescope (EGRET) source 3EG J1027-5817. The spin-down power of this young pulsar is great enough to make it very likely the counterpart for the EGRET source. We report here the discovery of gamma-ray pulsations from PSR J1028-5819 in early observations by the Large Area Telescope (LAT) on the Fermi Gamma-Ray Space Telescope. The gamma-ray light curve shows two sharp peaks having phase separation of 0.460 +/- 0.004, trailing the very narrow radio pulse by 0.200 +/- 0.003 in phase, very similar to that of other known gamma-ray pulsars. The measured gamma-ray flux gives an efficiency for the pulsar of similar to 10-20% (for outer magnetosphere beam models). No evidence of a surrounding pulsar wind nebula is seen in the current Fermi data but limits on associated emission are weak because the source lies in a crowded region with high background emission. However, the improved angular resolution afforded by the LAT enables the disentanglement of the previous COS-B and EGRET source detections into at least two distinct sources, one of which is now identified as PSR J1028-5819.
Place, publisher, year, edition, pages
2009. Vol. 695, no 1, L72-L77 p.
pulsars: general, stars: neutron
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-32189DOI: 10.1088/0004-637X/695/1/L72ISI: 000264539700016ScopusID: 2-s2.0-67650901898OAI: oai:DiVA.org:kth-32189DiVA: diva2:409525
FunderKnut and Alice Wallenberg Foundation
QC 201104082011-04-082011-04-08Bibliographically approved