Extended radio sources and elliptical galaxies. I - Small-diameter components in extended structures. II - A search for radio cores using the VLA

Details Extended radio sources and elliptical galaxies. I - Small-diameter components in extended structures. II - A search for radio cores using the VLA Extended radio sources and elliptical galaxies. I - Small-diameter components in extended structures. II - A search for radio cores using the VLA

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..704b&link_type=abstract

Astronomical Journal, vol. 83, July 1978, p. 704-717, 719-731. Research supported by the National Research Council of Canada and

Astronomy and Astrophysics

Astronomy

93

Astronomical Maps, Elliptical Galaxies, Galactic Nuclei, Radio Sources (Astronomy), High Resolution, Luminous Intensity, Position Errors, Radiant Flux Density, Self Absorption, Size Determination

Scientific paper

These papers report high-resolution observations of several hundred radio galaxies with the NRAO interferometer at 2.7 and 8.1 GHz and with the VLA at 4.9 GHz. The observations were performed to study the relation between the gross features of extended radio galaxies and their orientation relative to their parent optical objects as well as the current activity of the galaxies as evidenced by radio emission within their optical boundaries. First, results are presented for 48 extended radio galaxies at declinations greater than +15 deg in which small-diameter (less than 3 arcsec) components were detected. Radio data are provided for the small-diameter cores and the extended emission containing them, the resulting optical identifications of 44 extended structures are described, and the physical properties of the small components are analyzed. Implications are discussed for identifications of extended sources lacking detectable small-diameter components. Further observations with the VLA at 4.9 GHz are then reported which were made to improve the reliability of the identifications of 21 radio sources by detecting radio cores in the nuclei of the parent galaxies. Problems involved in the identification of extended radio sources are outlined.

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