Data di Pubblicazione:
2012
Abstract:
The Large Area Telescope on board the Fermi satellite observed a gamma-ray flare in the Crab Nebula lasting
for approximately nine days in April of 2011. The source, which at optical wavelengths has a size of ≈11 lt-yr
across, doubled its gamma-ray flux within eight hours. The peak photon flux was (186 ± 6) × 10−7 cm−2 s−1
above 100 MeV, which corresponds to a 30-fold increase compared to the average value. During the flare, a new
component emerged in the spectral energy distribution, which peaked at an energy of (375 ± 26) MeV at flare
maximum. The observations imply that the emission region was likely relativistically beamed toward us and that
variations in its motion are responsible for the observed spectral variability.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
gamma rays: stars , ISM: supernova remnants , magnetic reconnection , magnetohydrodynamics (MHD) , pulsars: individual (Crab) , radiation mechanisms: non-thermal
Elenco autori:
R. Buehler;J. D. Scargle;R. D. Blandford;L. Baldini;M. G. Baring;A. Belfiore;E. Charles;J. Chiang;F. D'Ammando;C. D. Dermer;S. Funk;J. E. Grove;A. K. Harding;E. Hays;M. Kerr;F. Massaro;M. N. Mazziotta;R. W. Romani;P. M. Saz Parkinson;A. F. Tennant;M. C. Weisskopf
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