Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-05-13
Mon.Not.Roy.Astron.Soc. 299 (1998) 165-170
Astronomy and Astrophysics
Astrophysics
7 pages, 8 figures. Accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.1998.01752.x
Two rival hypotheses have been proposed for the origin of the compact radio flux observed in radio-quiet quasars (RQQs). It has been suggested that the radio emission in these objects, typically some two or three orders of magnitude less powerful than in radio-loud quasars (RLQs), represents either emission from a circumnuclear starburst or is produced by radio jets with bulk kinetic powers 10^3 times lower than those of RLQs with similar luminosity ratios in other wavebands. We describe the results of high resolution (parsec-scale) radio-imaging observations of a sample of 12 RQQs using the Very Long Baseline Array (VLBA). We find strong evidence for jet-producing central engines in 8 members of our sample.
Beasley Anthony J.
Blundell Katherine M.
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