摘要
长期以来在E100 MeV能区,银河系已知天体中只有船帆座脉冲星和蟹状星云脉冲星被SAS-2和COS-B卫星证认为γ射线源。我们分析COS-B数据得到了天鹅座X-3的γ射线像,使天鹅座X-3成为第三个被证认的银河高能γ点源,这是在这一能区中被证认的第一个γ射线双星。 COS-B卫星γ探测器可测能量下限为40 MeV,迄今所有已发表的分析COS-B数据的工作都只利用了50 MeV以上的事例。对于50 MeV以下光子COS-B探测器的性能比几百MeV时差得多:探测效率只有1%左右。
Image analysis has been made to the COS-B data in the measured energy range lower than 50 MeV. A gamin-ray flux map of the Galaxy in 40—50 MeV has been obtained. The three known γ sources at higher energies, the vela pulsar, Crab pulsar and Cyg X-3, are visible on the map. There are other strong point-like sources indicated by this analysis, their estimated positions and fluxes are given for four possible sources with intensities near to or stronger than that of the Crab.
出处
《天文学报》
CSCD
北大核心
1990年第4期390-393,共4页
Acta Astronomica Sinica
基金
国家自然科学基金