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

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