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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. R.Bazer-Bachi J. -M. Lavigne J. -F. Olive A. Buczkowska J. Grygorczuk J. Juchniewicz P. McCulloch |
| Affiliation: | 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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