The Radio Source 0915+320: A 'Wide-Angle-Tail' Source in a Group of Galaxies

Details The Radio Source 0915+320: A 'Wide-Angle-Tail' Source in a Group of Galaxies The Radio Source 0915+320: A 'Wide-Angle-Tail' Source in a Group of Galaxies

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l...9f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, July 1, 1978, p. L9-L12. Research supported by the National Res

Astronomy and Astrophysics

Astronomy

12

Galactic Clusters, Radio Sources (Astronomy), Elliptical Galaxies, Galactic Radiation, Red Shift, Spiral Galaxies, Very Large Array (Vla)

Scientific paper

The radio source 0915+320 was observed at 4.9 GHz with six antennas of the Very Large Array in order to detect a small-diameter radio component and to map the extended radio emission in detail. A map with a resolution of 12 arcsec is presented which shows that the overall radio morphology of the source resembles that of three 'wide-angle-tail' sources previously detected in rich clusters of galaxies. A small-diameter core component coinciding to within 1 arcsec with the center of a 15-mag elliptical galaxy is found on a 2-arcsec-resolution map. The entire radio source is tentatively identified with the 15-mag elliptical, and it is noted that 0915+320 is not in a cataloged cluster of galaxies, although this source may be associated with the dominant elliptical galaxy of a group. It is therefore concluded that a rich cluster environment cannot be the primary factor in the formation of a wide-angle-tail structure. The suggestion is made that the main features of the wide-angle-tail morphology are more characteristic of the transitional luminosity range between the DI and DII morphology classes of strong double sources rather than of a given environment

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