Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..387u&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 15, 1986, p. 387-402. SERC-supported researc
Astronomy and Astrophysics
Astronomy
71
Extragalactic Radio Sources, Galactic Radio Waves, Seyfert Galaxies, Brightness Distribution, Forbidden Transitions, Luminosity, Pressure Distribution, Starburst Galaxies
Scientific paper
New MERLIN observations of the Seyfert galaxies NGC 5506, Mkn 6, Mkn 463, NGC 7674 (Mkn 533) and MCG 8-11-11 at 408 and 1666 MHz are presented. Most of the objects show linear or double radio structure consistent with collimated ejection, but the radio emission from NGC 5506 is diffuse, suggestive of a starburst. Compact off-nuclear radio components (less than 0.25 arcsec) are seen, with internal pressures substantially larger than that of the surrouding thermal gas. In order to study the overall properties of Seyfert radio components, both new and published observations are used to obtain a sample of Seyfert galaxies with well-resolved radio sources. It is found that the high-pressure radio components are unusual, and that most radio components are in approximate pressure balance with the surrounding medium. The internal energies of the radio components are similar in magnitude to the kinetic energy of the thermal gas in the forbidden-line region. Finally, an empirical relationship exists between the surface brightness and diameter of radio components, analogous to that for galactic supernova remnants.
Booler R. V.
Harrison A. B.
Pedlar Alan
Unger Stephen W.
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