Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201..263s&link_type=abstract
Astrophysical Journal, vol. 201, Oct. 15, 1975, pt. 1, p. 263-274.
Astronomy and Astrophysics
Astronomy
67
Antenna Arrays, Quasars, Radio Interferometers, Radio Sources (Astronomy), Seyfert Galaxies, High Resolution, Interferometry, Radiant Flux Density, Radio Telescopes, Red Shift, Visibility
Scientific paper
Results are discussed for observations of the cited sources (two quasars and two Seyfert galaxies) at several epochs at 2.8 cm with a multielement very-long-baseline interferometer. The optical identifications and redshifts of the sources are given, and data on their flux densities are presented in the form of visibility amplitude vs interferometer hour angle for each baseline and each epoch. The data indicate that the brightness distributions of each source are quite variable. It is shown that there are large changes in the visibilities of 3C 120 and 3C 273B on a time scale of months and that these changes can be explained by source structures composed of at least two components that are separating at extremely high, probably relativistic, velocities.
Cohen Morrel H.
Kellermann K. L.
Rinehart R.
Romney Jonathan D.
Schilizzi Richard T.
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