Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537001j&link_type=abstract
American Astronomical Society, AAS Meeting #215, #370.01; Bulletin of the American Astronomical Society, Vol. 42, p.561
Astronomy and Astrophysics
Astronomy
Scientific paper
The Vela pulsar is one of the most exciting gamma-ray sources and has been at the forefront of high energy pulsar science since the detection of gamma-ray pulsations at the radio period by SAS-2 in 1975. With the unprecedented angular resolution, effective area, field of view, and timing resolution, in the GeV band, of the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope the light curve of the Vela pulsar can be studied in greater detail than ever before. Using a timing solution derived solely from the LAT data, phase aligned with the radio emission, the spectrum of the Vela pulsar has been fit in intervals as small as 0.0016 in phase. Significant variation is seen in the cutoff energy and spectral index across the light curve which seems to correlate with the radius of curvature, strongly supporting curvature radiation as the source of the high energy gamma-rays from the Vela pulsar.
Fermi Large Area Telescope Collaboration
Johnson Tyrel J.
Timing Consortium
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