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

A.A. Abdo Markus Ackermann W. B. Atwood Luca Baldini Jean Ballet Guido Barbiellini M. G. Baring D. Bastieri B. M. Baughman K. Bechtol R. Bellazzini B. Berenji E. D. Bloom E. Bonamente A. W. Borgland J. Bregeon A. Brez M. Brigida Pascal Bruel 1 T. H. Burnett G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian C. Cecchi E. Charles A. Chekhtman C. C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 2 L. R. Cominsky J. Conrad C. D. Dermer A. de Angelis F. de Palma S. W. Digel D. Donato M. Dormody E. Do Couto E Silva P. S. Drell R. Dubois D. Dumora 3 Y. Edmonds C. Farnier C. Favuzzi P. Fleury 1 W. B. Focke M. Frailis Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Gehrels S. Germani B. Giebels 1 N. Giglietto F. Giordano T. Glanzman G. Godfrey I. A. Grenier M.-H. Grondin 3 J. E. Grove L. Guillemot 3 S. Guiriec 2 A. K. Harding M. Hayashida E. Hays R. E. Hughes G. Jóhannesson A. S. Johnson R. P. Johnson T. J. Johnson W. N. Johnson S. Johnston T. Kamae H. Katagiri J. Kataoka N. Kawai M. Kerr J. Knödlseder 4 N. Komin 2, 5 M. Kramer F. Kuehn M. Kuss L. Latronico S.-H. Lee M. Lemoine-Goumard 3 F. Longo F. Loparco B. Lott 3 M. N. Lovellette P. Lubrano A. Makeev M. Marelli M. N. Mazziotta W. Mcconville J. E. Mcenery C. Meurer P. F. Michelson W. Mitthumsiri T. Mizuno A. A. Moiseev C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia P. L. Nolan E. Nuss 2 T. Ohsugi N. Omodei E. Orlando J. F. Ormes D. Paneque J. H. Panetta D. Parent 3 M. Pepe M. Pesce-Rollins F. Piron 2 T.A. Porter S. Rainò R. Rando M. Razzano A. Reimer O. Reimer T. Reposeur 3 S. Ritz L. S. Rochester A. Y. Rodriguez R. W. Romani M. Roth F. Ryde H. F.-W. Sadrozinski D. Sanchez 1 A. Sander P. M. Saz Parkinson C. Sgrò E. J. Siskind David Stanley Smith 3 P. D. Smith G. Spandre P. Spinelli Jean-Luc Starck M. S. Strickman D. J. Suson H. Tajima H. Takahashi T. Tanaka J. B. Thayer J. G. Thayer D. J. Thompson S. E. Thorsett L. Tibaldo D. F. Torres G. Tosti A. Tramacere Y. Uchiyama T. L. Usher A. van Etten N. Vilchez 4 V. Vitale A. P. Waite K. Watters K. S. Wood T. Ylinen M. Ziegler G. Hobbs M. Keith R.N. Manchester P. Weltevrede
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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Submitted on : Wednesday, April 22, 2009 - 9:39:01 AM
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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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