# Discovery of Pulsed Gamma Rays from the Young Radio Pulsar PSR J1028-5819 with the Fermi Large Area Telescope

Abstract : Radio pulsar PSR J1028-5819 was recently discovered in a high-frequency search (at 3.1 GHz)in the error circle of the 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 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.
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http://hal.in2p3.fr/in2p3-00377212
Contributor : Virginie Mas <>
Submitted on : Wednesday, April 22, 2009 - 9:39:01 AM
Last modification on : Tuesday, November 17, 2020 - 8:58:03 PM

### Citation

A.A. Abdo, Markus Ackermann, W. B. Atwood, Luca Baldini, Jean Ballet, et al.. Discovery of Pulsed Gamma Rays from the Young Radio Pulsar PSR J1028-5819 with the Fermi Large Area Telescope. The Astrophysical journal letters, Bristol : IOP Publishing, 2009, 695, pp.L72-L77. ⟨10.1088/0004-637X/695/1/L72⟩. ⟨in2p3-00377212⟩

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