Extended radio jets and compact cores in quasars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Extragalactic Radio Sources, Quasars, Radio Jets (Astronomy), Statistical Tests, Astronomical Catalogs, Line Of Sight, Red Shift, Relativistic Electron Beams, Statistical Distributions

Scientific paper

For a sample of 59 quasars observed with the VLA, some consequnces of the relativistic beaming picture for extended radio jets have been investigated. Taking the fraction of emission from the core as a statistical indicator of the orientation of the source, it is found that radio jets occur more frequently in sources inclined at small angles to the line-of-sight. The sources without jets almost never show very prominent cores. Jets which are very dissipative may, however, also be observed in sources which lie close to the plane of the sky. Such jets dissipate a significant fraction of their energy along their path and tend to form either no hotspot or one that is less prominent. Radio sources with jets tend to appear more misaligned, again consistent with a smaller inclination to the line-of-sight. The projected linear size distributions for sources with and without jets are not significantly different, perhaps because of the intrinsic size distribution of quasars and also the occurrence of slow, very dissipative jets.

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