Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246...28j&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 28-37. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
78
Galactic Nuclei, Galactic Structure, Radio Galaxies, Very Long Base Interferometry, Active Galaxies, Astronomical Models, Halos, Luminosity, Quasars
Scientific paper
A three telescope VLBI survey has been carried out of optically bright galaxies with nuclear radio sources which are unresolved at a few seconds of arc. Twenty out of 58 galaxies were detected at 18 cm, indicating the presence of radio structure on a scale of about 10 milli-arcsec. Most of these were normal galaxies, although emission lines were present in many cases. Fifteen of the galaxies detected in the survey (as well as M51, M81, and M82) were then observed in a six telescope VLBI network experiment to determine the general structure of the compact nuclear sources. Models of the milli-arcsec radio structure were developed for 17 of these 18 galaxies. Except for the unusually complex source in M87, the models are all composed of a small number of components in a region no larger than a few parsecs. They resemble models and hybrid maps of the compact sources in quasars and active galaxies, indicating that a common physical mechanism is probably responsible for the compact radio sources in a wide range of optical objects.
Jones Llanwyn D.
Sramek Richard A.
Terzian Ye.
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