VLA Observations of a New Population of Blazars

We present the first deep VLA radio images of flat-spectrum radio quasars(FSRQ) with multiwavelength emission properties similar to those of BL Lacswith synchrotron X-rays. Our observations of twenty-five of these sources showthat their radio morphologies are similar to those of other radio quasars.However, their range of extended powers is more similar to that of BL Lacertaeobjects (BL Lacs) and extends down to the low values typical of FR I radiogalaxies. Five out of our nine lobe-dominated sources have extended radiopowers in the range typical of both FR I and FR II radio galaxies, but theirextended radio structure is clearly FR II-like. Therefore, we have not yetfound a large population of radio quasars hosted by FR Is. Two thirds of oursources have a core-dominated radio morpholgy and thus X-rays likely dominatedby the jet. We find that their ratios of radio core to total X-ray luminosityare low and in the regime indicative of synchrotron X-rays. This result showsthat also blazars with strong emission lines can produce jets of high-energysynchrotron emission and undermines at least in part the ``blazar sequence''scenario which advocates that particle Compton cooling by an external radiationfield governs the frequency of the synchrotron emission peak.Comment: 26 pages, 33 figures. Accepted for publication in Ap