星系研究组知识库

收集了 2 9个有γ噪的Blazar天体 (其中有 16个BLLac天体和 13个平谱射电类星体 )的近红外流量密度和γ射线流量密度 ,获得以下主要结果 :1) 2 3个天体中的γ射线流量密度和近红外流量密度在低态时存在较强的相关性而在高态时有弱的相关性 .2 )在 2 9个天体中 ,有 6个天体只有一个观测数据点 ,将其认为是高态时 ,γ射线流量密度与近红外光流量密度之间有弱相关性 ,而认为是低态时有强相关性 .3) 2 9个源的γ射线流量密度与X射线流量密度在低态时有相关性 ,但是γ射线流量与光学流量密度 ,γ射线流量与射电流量密度均没有相关性 .4)在 16个BLLac天体中γ射线流量与近红外光流量不论在高态还是低态都有相关性 ,而 13个平谱射电类星体没有相关性 .讨论了γ噪Blazar天体的γ射线辐射机制 ,认为γ射线的辐射机制主要是同步自康普顿散射 .而逆康普顿散射来自绕中心核且温度约为 2 0 0 0K的尘埃 ,这些尘埃的区域大约有r =3pc ,聚束的相对论电子也可能是这种尘埃模型辐射机制的一个重要补充 .平谱射电类星体和BLLac天体的γ辐射机制可能有些不同 .

We have collected 29 gamma-ray-loud blazars (16 BL Lac objects and 13 flat-spectrum radio quasars) with both observed near-IR and gamma -ray flux densitees, with the following main results: (1)there is a very strong correlation between F-gamma and F-IR in the low state, and a weaker but also significant correlation between F-gamma and F-IR in the high state for 23 objects with both high and low state fluxes; (2) there is a very significant correlation between F-gamma and F-IR in the low state, and a weak correlation between F-gamma and F-IR in the high state for 29 sources; (3) there is a correlation between F-gamma and F-IR but not between F-gamma and F-O, and F-R for both the low and high state of 26 sources; (4) there is a strong correlation between F-gamma and F-IR in the low and high states for 15 BL Lac objects, but not for 11 flat-spectrum radio quasars. Possible constraints on the gamma -ray emissionmechanism are discussed. We suggest that the main gamma-ray radiation mechanism is probably the synchrotron self-Compton process. The inverse Compton scattering of the radiation from hot circumnuclear dust with T-g = 2000K, which is located within the region of r approximate to 3pc, by beamed ultrarelativistic electrons is likely to be an important complementary mechanism. In addition, the gamma -ray emission may be somewhat different for BL Lac objects and flat-spectrum radio quasars.