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    Discovery of pulsed γ-rays from PSR J0034-0534 with the Fermi Large Area Telescope: a case for co-located radio and γ-ray emission regions

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    2010Discoveryofpulsed 0004-637X_712_2_957.pdf (457.7Kb)
    Date
    2010
    Author
    Abdo, A.A.
    Venter, C.
    Ackermann, M.
    Ajello, M.
    Allafort, A.
    Fermi LAT
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    Abstract
    Millisecond pulsars (MSPs) have been firmly established as a class of γ-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 γ-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 γ-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 γ-ray peaks strongly suggests that the radio and γ-ray emission regions are co-located and both are the result of caustic formation.
    URI
    http://hdl.handle.net/10394/10470
    http://dx.doi.org/10.1088/0004-637X/712/2/957
    https://iopscience.iop.org/0004-637X/712/2/957/pdf/0004-637X_712_2_957.pdf
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