Relativistic Jets in Radio-Weak Quasars and LINER Galaxies

: We discuss radio observations of a sample of radio-weak and radio-intermediate quasars which demonstrate that -- just like their radio-loud counterparts -- radioweak quasars too have relativistic jets in their nuclei. Moreover, a VLA survey of nearby LINER galaxies reveals a relatively large number of flat-spectrum radio cores. It is suggested that those cores are also best explained by moderately relativistic jets (fl ¸ 2) produced by a central engine. 1 Introduction When we discuss the properties of relativistic jets in AGN, we usually tend to think about radio galaxies and radio-loud, core-dominated quasars. The observation of superluminal motion and of many other indicators of high bulk Lorentz factors in these sources have established the existence of relativistic jets there beyond any doubt. But is this the whole universe, or just the tip of the iceberg? In comparison to stellar winds it is often argued that the escape speed from the central object is an important factor that d...