Small-scale structure of quasars and galactic nuclei at radio wavelengths

Details Small-scale structure of quasars and galactic nuclei at radio wavelengths Small-scale structure of quasars and galactic nuclei at radio wavelengths

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975nyasa.262..428c&link_type=abstract

(AAS, American Physical Society, and New York Academy of Sciences, Texas Symposium on Relativistic Astrophysics, 7th, Dallas, Te

Astronomy and Astrophysics

Astrophysics

7

Astronomical Models, Extragalactic Radio Sources, Galactic Nuclei, Quasars, Radio Galaxies, Astronomical Spectroscopy, Interferometry, Least Squares Method, Relativistic Effects, Visibility

Scientific paper

Results of very-long-baseline interferometry studies have been used to generate models of extragalactic radio sources with a wide range of important sizes. Most analyses use only the measured amplitude of the visibility function. A set of elliptical Gaussian components is selected and a least-squares calculation determines the optimum parameters. Models of the sources 3C 120, 3C 273, and 3C 279 are discussed. All three sources have exhibited regular expansions in size. Although there have been jumps to a small size or 'point', a regular contraction has never been observed. The regular increases in apparent angular size are most simply explained as relativistic expansion.

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