Discovery of Pulsed $\gamma$-rays from PSR J0034-0534 with the Fermi LAT: A Case for Co-located Radio and $\gamma$-ray Emission Regions
The Astrophysical Journal(2010)
摘要
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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