四个PG类星体的谱能结构与红外辐射机制  

The Continuum Energy Distributions of Four PG Quasars and Their Infrared Radiative Mechanism

作　　者：吴建新[1] 周又元[2] 

机构地区：[1]华南师范大学物理系 [2]中国科技大学天体物理中心

出　　处：《天体物理学报》1996年第3期231-238,共8页

基　　金：广东省高教厅基金

摘　　要：本文利用宽波段能谱结构讨论了四个PG类星体的红外辐射机制．结果表明，在产生红外连续辐射的可能机制中，非热的、具有幂律特征的辐射和被核光度加热的“核尘埃”的热再辐射是红外辐射的主要来源．对于高光度的活动星系核，它的主星系的红外辐射及恒星形成区的红外辐射是可以忽略的．In the present paper, the continua of four PG quasars from X-ray regions through the far-infrared are discussed. The spectral energy distributions show a variety of shapes which can be explained by combining five components in varying proportions. Nonthermal emission and thermal dust emission both contribute substantially to the infrared bump. For all four quasaxs discussed, the nonthermal emission, spanning at least five decades of frequencies, is found by our model to have a power-law index near unity. The nonthermal process is found to have produced the uniform-energy-distribution status of ufu const. The contributions from the host galaxy and starburst region near the nuclei are negligible in the infrared for luminous quasars.

关 键 词：类星体 谱能结构 红外辐射 

分 类 号：P158[天文地球—天文学]