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Time variations of high energy gamma emission of Vela Pulsar observed by GAMMA-1 telescope |
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| Authors: | V V Akimov V G Afanassyev I D Blokhintsev N G Leikov V E Nesterov A M Galper Y V Ozerov V A Rugki V M Zemskov M I Fradkin N P Topchiev E I Chuiken E Barouch I Grenier M Gros A RBazer-Bachi J -M Lavigne J -F Olive A Buczkowska J Grygorczuk J Juchniewicz P McCulloch |
| Institution: | 1 Space Research Institute of the Academy of Sciences of the RF, Profsoyuznaya 84/32, 117810, Moscow, Russia 2 Moscow Physical Engineering Institute, Kashirskoe shosse 31, 115409, Moscow, Russia 3 Lebedev Physical Institute of the Academy of Sciences of the RF, Leninsky prospect 53, 117924, Moscow, Russia 4 Ioffe Physical and Technical Institute of the Academy of Sciences of the USSR, Polytechnicheskaya 26, 194021, St. Petersburg, Russia 5 Centre d'Etudes Nucleaires, 91191, Saclay, France 6 Centre d'Etude Spatiales des Rayonnements, 31029, Toulouse, France 7 CBK-PAN, Warsaw, Poland 8 Physics Department, University of Tasmania, Hobart, Australia |
| Abstract: | Two observations of the Vela Pulsar in the energy range 50–5000 MeV performed with the GAMMA-1 telescope in 1990 and 1991 allowed us to study time variability of the pulsar light curve and energy spectra. The light curve for Eγ > 50 MeV shows definite variations in the first interpeak phase interval. The energy spectra of the two main peaks and first interpeak in the lightcurve vary significantly below 200 MeV. |
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