Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..383s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, Aug. 1, 1985, p. 383-393.
Astronomy and Astrophysics
Astronomy
24
Active Galactic Nuclei, Extragalactic Radio Sources, Radiant Flux Density, Relativistic Velocity, Centimeter Waves, Doppler Effect, Synchrotron Radiation
Scientific paper
An analysis is conducted of ten prominent meter-wavelength flux variability effects associated with seven extragalactic radio sources, in light of the hypothesis that the sources' variable components have a bulk relativistic motion and radiate by means of the incoherent synchrotron process. The Doppler factor for each variable component is derived; their lower limits have a median value of about 70, which is noted to be far higher than the value of 20 inferred for similar events in the past. The present lower limits are also much higher than values inferred from prominent, well observed outbursts at cm wavelengths, X-ray observations, and VLBI measurements of the superluminal motion in active galactic nuclei.
Gopal-Krishna
Singal Ashok K.
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