A RELATION BETWEEN THE APPARENT VELOCITY AND THE SPECTRAL POWER OF SUPERLUMINAL RADIO SOURCES  

作　　者：吴盛殷 A.QUIRRENBACH A.WITZEL 

机构地区：[1]Beijing Astronomical Observatory, Academia Sinica, Beijing 100080, PRC [2]Max-Planck-Institut fur Radioastronomie, FRG

出　　处：《Science China Chemistry》1992年第10期1254-1265,共12页中国科学（化学英文版）

基　　金：Supported by the National Natural Science Foundation of China and an honorarium provided by the MPG.

摘　　要：It is proved that the apparent transverse velocities β_(app) and the spectral powers at 10GHz P_(10) of the cores of known superluminal sources are correlated. An interpretation ofthis result within the framework of the relativistic jet model shows that the jet Lorentzfactor γ depends on the intrinsic luminosity of the sources. The probable existence of twosubpopulations of the superluminal sources is shown by a linear regression analysis. 'Small'sources f i.e. the sources without extended emission or with a distance from the core tothe outer edge of the lobe<20 kpc, show lower β_(app) than the 'large' objects; this can beinterpreted as an orientation effect. Since all BL Lac objects belong to the 'small' class,this result sheds new light on such a question as why these sources have lower apparent ve-locities than the 'classical' superluminal quasars.It is proved that the apparent transverse velocities β_app and the spectral powers at 10GHz P₁₀ of the cores of known superluminal sources are correlated. An interpretation ofthis result within the framework of the relativistic jet model shows that the jet Lorentzfactor γ depends on the intrinsic luminosity of the sources. The probable existence of twosubpopulations of the superluminal sources is shown by a linear regression analysis. "Small"sources f i.e. the sources without extended emission or with a distance from the core tothe outer edge of the lobe&lt;20 kpc, show lower β_app than the "large" objects; this can beinterpreted as an orientation effect. Since all BL Lac objects belong to the "small" class,this result sheds new light on such a question as why these sources have lower apparent ve-locities than the "classical" superluminal quasars.

关 键 词：RADIO sources general-quasars jets BL Lacertae OBJECTS 

分 类 号：O6[理学—化学]