Discovery of Pulsed \gamma-Rays from PSR J0034–0534 with the Fermi Large Area Telescope: A Case for Co-Located Radio and \gamma-Ray Emission Regions
Abdo, A. A. AA ; Ackermann, M. ; Ajello, M. ;
Apr - 2010
ISSN : 0004-637X ;
journal : The Astrophysical Journal

Issue : 2
type: Article Journal

Abstract
Millisecond pulsars (MSPs) have been firmly established as a class of ³-ray emitters via the detection of pulsations above 0.1 GeV from eight MSPs by the Fermi Large Area Telescope (LAT). Using 13 months of LAT data, significant ³-ray pulsations at the radio period have been detected from the MSP PSR J00340534, making it the ninth clear MSP detection by the LAT. The ³-ray light curve shows two peaks separated by 0.274 ± 0.015 in phase which are very nearly aligned with the radio peaks, a phenomenon seen only in the Crab pulsar until now. The 0.1 GeV spectrum of this pulsar is well fit by an exponentially cutoff power law with a cutoff energy of 1.8 ± 0.6 ± 0.1 GeV and a photon index of 1.5 ± 0.2 ± 0.1, first errors are statistical and second are systematic. The near-alignment of the radio and ³-ray peaks strongly suggests that the radio and ³-ray emission regions are co-located and both are the result of caustic formation.

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