Observation of the VELA gamma-ray pulsar with the GAMMA-1 telescope

J F Olive,N G Leikov,V V Akimov,V G Afanassyev,Eytan Barouch, R Bazerbachi, I Blochintsev,A Buczkowska,E I Chuikin,M I Fradkin, A M Galper,I A Grenier, Mladen Gros,Jerzy Grygorczuk,J Juchniewicz,J M Lavigne,P M Mcculloch,V E Nesterov,Yu V Ozerov,V A Rudko,N P Topchiev,V M Zemskov

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES（1993）

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摘要

The GAMMA-1 telescope observed PSR0833-45 in the summer of 1990 and spring of 1991. We found that the mean 300-5000 MeV flux (5.25 +/- 0.45 x 10(-6) ph/cm2 sec) of the whole pulsed emission is consistent with the time-averaged COS-B result (1975-1982). The 50-300 MeV flux (8.30 +/- 2.9 x 10(-6) ph/cm2 sec) suggests that we observed the pulsar in a low intensity state. The emission from the first peak appears softer than the second peak (first observation: 1.7sigma, second: 3sigma confidence level). We investigate the variation of the spectra with time.

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关键词

GAMMA-RAYS, PULSARS,PSR0833-45, VELA

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