Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241...15q&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 15-21.
Astronomy and Astrophysics
Astronomy
141
Astronomical Models, Quasars, Radio Sources (Astronomy), Variability, Astronomical Spectroscopy, Light Curve, Radio Jets (Astronomy), Relativistic Effects, Shock Wave Propagation
Scientific paper
Rapid variations in flux density and polarization with time scales of about 1 day in the quasar 0917 + 624 are discussed. Simultaneous variations in flux density in five wavebands from 2 cm to 20 cm, an anticorrelation between the variations in flux density and degree of polarization, and one rapid swing of polarization angle were observed. These phenomena can be explained by a shocked-jet model, which involves two components: an underlying relativistic jet and shock which moves relativistically along the jet and causes the variability of flux density and polarization. The short variability time scales are interpreted as due to apparent superluminal motion, which resolves the brightness temperature problem: the relativistic shock moves along the line of sight through inhomogeneous small-scale (about 0.04-0.16 pc) structures distributed along the jet.
Hummel Christian A.
Krichbaum Thomas P.
Qian Shan-Jie
Quirrenbach Andreas
Witzel Andreas
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