62 articles – 637 Notices  [english version]
 HAL : in2p3-00475596, version 1
 arXiv : 1002.2607
 Astrophysical Journal 712 (2010) 957-963
 Discovery of Pulsed $\gamma$-rays from PSR J0034-0534 with the Fermi LAT: A Case for Co-located Radio and $\gamma$-ray Emission Regions
 (01/04/2010)
 Millisecond pulsars (MSPs) have been firmly established as a class of gamma-ray emitters via the detection of pulsations above 0.1 GeV from eight MSPs by the Fermi Large Area Telescope (LAT). Using thirteen months of LAT data significant gamma-ray pulsations at the radio period have been detected from the MSP PSR J0034-0534, making it the ninth clear MSP detection by the LAT. The gamma-ray light curve shows two peaks separated by 0.274$\pm$0.015 in phase which are very nearly aligned with the radio peaks, a phenomenon seen only in the Crab pulsar until now. The $\geq$0.1 GeV spectrum of this pulsar is well fit by an exponentially cutoff power law with a cutoff energy of 1.8$\pm 0.6\pm$0.1 GeV and a photon index of 1.5$\pm 0.2\pm$0.1, first errors are statistical and second are systematic. The near-alignment of the radio and gamma-ray peaks strongly suggests that the radio and gamma-ray emission regions are co-located and both are the result of caustic formation.
 Thème(s) : Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
 Mot(s)-clé(s) : gamma rays: general – pulsars: general – pulsars: individual (PSR J0034−0534)
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1002.2607
 in2p3-00475596, version 1 http://hal.in2p3.fr/in2p3-00475596 oai:hal.in2p3.fr:in2p3-00475596 Contributeur : Virginie Mas <> Déposé pour le compte de : David Smith <> Soumis le : Jeudi 22 Avril 2010, 12:02:24 Dernière modification le : Lundi 10 Mai 2010, 11:57:43