It is proved that the apparent transverse velocities β<sub>app</sub> and the spectral powers at 10GHz P<sub>10</sub> of the cores of known superluminal sources are correlated. An interpretatio...It is proved that the apparent transverse velocities β<sub>app</sub> and the spectral powers at 10GHz P<sub>10</sub> 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<sub>app</sub> 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.展开更多
基金Supported by the National Natural Science Foundation of China and an honorarium provided by the MPG.
文摘It is proved that the apparent transverse velocities β<sub>app</sub> and the spectral powers at 10GHz P<sub>10</sub> 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<sub>app</sub> 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.
