【摘要】 本文第1部份,描述从SAS-2卫星得到的能量大于100MeV的宇宙Υ射线数据来证认有Υ射线的活动星系核。11个类星体、3个BLLac天体和1个射电星系的Υ射线辐射已得到证认。 本文第2部分描述活动星系核对河外Υ射线背景辐射的影响。SAS-2的Υ辐射数据,已被用来测定类星体和赛弗特星系的Υ辐射绝对光度与光学绝对光度间的函数关系,并由此导出它们对河外Υ射线背景辐射的贡献。我们指出,类星体(B<20)、赛弗特星系(1型和1.5型)对35—100MeV能量范围的弥散Υ射线背景辐射有相当大的贡献(59％)。由此我们得出河外Υ射线背景辐射可能是由类星体和赛弗特星系这类活动星系产生的结论。 本文第3部份我们对3个有Υ辐射的活动星系核综合其Υ波段和其他波段的数据,以探索这些天体辐射的发射机制。这些综合的数据对发射机制给出严格的限制。我们指出,对这3个天体的数据,与同步自康普顿模型(SSC)的预计是一致的。更多还原

【Abstract】 In the first part of this paper, we have described the identification of y-ray AGNs by using the database of cosmic r- rays above 100 MeV from the SAS-2 satellite. Gamma-ray emissions from 11 quasars, 3 BL Lac Objects and 1 radiogalaxy have been identified.In the second part of this paper, we have described the determination of the contribution from AGNs to the extragalactic y-ray background. The SAS-2 r-ray data have been employed to determine the functional relationships between the absolute y-ray luminosities Ly and the absolute optical luminosities of quasars and Seyfert galaxies. From these, their contribution to the extragalactic y-ray background have been derived. We have shown that quasars(B<20)and Seyfert (Type l and 1.5) galaxies together contribute to a substantial part (about 59%)of the diffuse y-ray background in the 35-100 MeV range. We conclude that the extragalactic r-ray background is likely to be generated by active galaxies such as quasars and Seyfert galaxies.In the third part of this paper, we have combined the data from the y-ray region and those from other wavebands for 3 y-ray AGNs to investigate the emission mechanisms of radiations from these objects. These gamma ray data together with data in other wavebands give severe constraints to the emission mechanisms of radiations from these objects. We have shown that the data for these three objects agree with those predicted by the synchrotron self-Compton (SSC)model.更多还原