# Discovery of Pulsed $\gamma$-rays from PSR J0034-0534 with the Fermi LAT: A Case for Co-located Radio and $\gamma$-ray Emission Regions

Abstract : 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.
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Astrophysical Journal, American Astronomical Society, 2010, 712, pp.957-963. 〈10.1088/0004-637X/712/2/957〉

http://hal.in2p3.fr/in2p3-00475596
Contributeur : Virginie Mas <>
Soumis le : jeudi 22 avril 2010 - 12:02:24
Dernière modification le : mardi 29 mai 2018 - 12:50:47

### Citation

A. A. Abdo, Markus Ackermann, Marco Ajello, A. Allafort, Luca Baldini, et al.. Discovery of Pulsed $\gamma$-rays from PSR J0034-0534 with the Fermi LAT: A Case for Co-located Radio and $\gamma$-ray Emission Regions. Astrophysical Journal, American Astronomical Society, 2010, 712, pp.957-963. 〈10.1088/0004-637X/712/2/957〉. 〈in2p3-00475596〉

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