Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..231s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 1, 1984, p. 231-238.
Astronomy and Astrophysics
Astronomy
21
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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