【摘 要】
：
The question whether the radio properties of quasars are related tothe mass of the central black hole or the accretion rate is important for our un-derstanding
【机 构】
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Center for Astrophysics
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The question whether the radio properties of quasars are related tothe mass of the central black hole or the accretion rate is important for our un-derstanding of the formation of relativistic jets, but no consensus has been reachedfrom statistical analyses. Using two large quasar samples, one radio-selected, oneoptical-selected, we re-examined these relations and find that previous differencesbetween radio- and optical- selected samples can be ascribed, at least partly, to theeffect of the narrow line component. All previous claimed correlations are muchweaker, if exist at all.
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