Authors
AA Abdo, Markus Ackermann, Marco Ajello, WB Atwood, Magnus Axelsson, Luca Baldini, Jean Ballet, Guido Barbiellini, MG Baring, Denis Bastieri, K Bechtol, R Bellazzini, B Berenji, RD Blandford, ED Bloom, Emanuele Bonamente, AW Borgland, J Bregeon, A Brez, M Brigida, Pascal Bruel, TH Burnett, GA Caliandro, RA Cameron, F Camilo, PA Caraveo, JM Casandjian, Claudia Cecchi, Ö Çelik, A Chekhtman, CC Cheung, J Chiang, S Ciprini, R Claus, Ismaël Cognard, J Cohen-Tanugi, LR Cominsky, J Conrad, CD Dermer, A De Angelis, A De Luca, F De Palma, SW Digel, E do Couto e Silva, PS Drell, R Dubois, D Dumora, C Espinoza, C Farnier, C Favuzzi, SJ Fegan, EC Ferrara, WB Focke, M Frailis, PCC Freire, Y Fukazawa, S Funk, Piergiorgio Fusco, F Gargano, D Gasparrini, N Gehrels, S Germani, G Giavitto, B Giebels, N Giglietto, Francesco Giordano, T Glanzman, G Godfrey, IA Grenier, M-H Grondin, JE Grove, L Guillemot, S Guiriec, Y Hanabata, AK Harding, M Hayashida, E Hays, RE Hughes, G Jóhannesson, AS Johnson, RP Johnson, TJ Johnson, WN Johnson, S Johnston, T Kamae, H Katagiri, J Kataoka, N Kawai, M Kerr, J Knödlseder, ML Kocian, M Kramer, F Kuehn, M Kuss, J Lande, L Latronico, S-H Lee, M Lemoine-Goumard, Francesco Longo, Francesco Loparco, B Lott, MN Lovellette, P Lubrano, AG Lyne, A Makeev, M Marelli, MN Mazziotta, JE McEnery, C Meurer, PF Michelson, W Mitthumsiri, T Mizuno, AA Moiseev, C Monte, ME Monzani, E Moretti, A Morselli, IV Moskalenko, S Murgia, T Nakamori, PL Nolan, JP Norris, A Noutsos, E Nuss, T Ohsugi, N Omodei, E Orlando, JF Ormes, M Ozaki, D Paneque, JH Panetta, D Parent, V Pelassa, M Pepe, M Pesce-Rollins, M Pierbattista, F Piron, TA Porter, Silvia Raino, Riccardo Rando, PS Ray, Massimiliano Razzano, A Reimer, O Reimer, T Reposeur, S Ritz, LS Rochester, AY Rodriguez, RW Romani, M Roth
Publication date
2009/12/21
Journal
The Astrophysical Journal
Volume
708
Issue
2
Pages
1254
Publisher
IOP Publishing
Description
We report on γ-ray observations of the Crab Pulsar and Nebula using 8 months of survey data with the Fermi Large Area Telescope (LAT). The high quality light curve obtained using the ephemeris provided by the Nançay and Jodrell Bank radio telescopes shows two main peaks stable in phase with energy. The first γ-ray peak leads the radio main pulse by (281±12±21) μs, giving new constraints on the production site of non-thermal emission in pulsar magnetospheres. The first uncertainty is due to γ-ray statistics, and the second arises from the rotation parameters. The improved sensitivity and the unprecedented statistics afforded by the LAT enable precise measurement of the Crab Pulsar spectral parameters: cut-off energy at E c=(5.8±0.5±1.2) GeV, spectral index of Γ=(1.97±0.02±0.06) and integral photon flux above 100 MeV of (2.09±0.03±0.18)× 10− 6 cm− 2 s− 1. The first errors represent the statistical error on …
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AA Abdo, M Ackermann, M Ajello, WB Atwood… - The Astrophysical Journal, 2009