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
2010 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 712, no 2, 957-963 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2010. Vol. 712, no 2, 957-963 p.
gamma rays: general, pulsars: general, pulsars: individual (PSR, J0034-0534), millisecond pulsars, light curves, giant pulses, crab pulsar, slot, gaps, radiation, geometry, search
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-19313DOI: 10.1088/0004-637x/712/2/957ISI: 000275594600016ScopusID: 2-s2.0-77950202588OAI: oai:DiVA.org:kth-19313DiVA: diva2:337360
QC 201005252010-08-052010-08-052011-01-25Bibliographically approved