Journal
ASTROPHYSICAL JOURNAL
Volume 712, Issue 2, Pages 957-963Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/712/2/957
Keywords
gamma rays: general; pulsars: general; pulsars: individual (PSR J0034-0534)
Categories
Funding
- Netherlands Foundation for Radio Astronomy, ASTRON
- Direct For Mathematical & Physical Scien [0807512] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0807512] Funding Source: National Science Foundation
- ICREA Funding Source: Custom
- STFC [ST/G002487/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G002487/1] Funding Source: researchfish
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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 13 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 +/- 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 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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