Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990rmxaa..21...74d&link_type=abstract
Revista Mexicana de Astronomia y Astrofisica, Vol. 21, p. 74 - 78
Astronomy and Astrophysics
Astronomy
Superluminal Motions: Active Galactic Nuclei, Superluminal Motions: Quasars, Superluminal Motions: Hydrodynamics, Superluminal Motions: Plasma Jets
Scientific paper
VLBI maps of such sources as 3C 273 and 3C 345 show that these sources contain a diffuse jet-like feature in which are embedded knots with apparent superluminal motion. Over the last few years, evidence has increased against the standard beaming relativistic model for explaining superluminal motion. In these models, extremely relativistic flows with velocity ratios βJ2≡VJ2/c2 ≍ 0.84 - 0.99 are required. The authors examine a basically nonrelativistic model where the knots are formed by a synchrotron radiation thermal instability. They investigate the possibility that the apparent superluminal motion is a fruit of the dynamics of propagation of the instability.
de Gouveia dal Pino Elisabete M.
Opher Reuven
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