Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21334502g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #345.02; Bulletin of the American Astronomical Society, Vol. 41, p.480
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on initial observations of the Vela pulsar with the LAT instrument of the Fermi satellite. The data show that the telescope is working very well, with effective area, angular resolution and energy response close to those expected. The data provide a remarkable 0.1-10 GeV Vela pulse profile, assembled from over 50,000 photons, that shows features as sharp as 300 microseconds. This demonstrates not only the excellent LAT time resolution, but also the effective pulsar monitoring in the radio that provides the LAT a high quality ephemeris. The pulse structure evolves strongly with energy; in particular a sharp third peak joins the two well-known dominant pulse peaks. This appears during the "bridge" between the peaks and shifts to later phases at high energies. Pulsed emission from this feature and the second peak are detected to over 15 GeV. Examining the off-pulse phase we place useful limits on steady plerionic emission. Finally we make a much-improved measurement of the high-energy cut-off in Vela's spectrum.
Fermi LAT Collaboration
Grove Eric J.
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