Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..291n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 20, 1990, p. 291-295.
Astronomy and Astrophysics
Astronomy
70
Active Galaxies, Galactic Nuclei, Infrared Sources (Astronomy), Radio Sources (Astronomy), Seyfert Galaxies, Far Infrared Radiation, Luminosity, Quasars, Starburst Galaxies
Scientific paper
Active galaxies are frequently considered to be powered primarily either by an ionizing compact (quasar) core or else by starburst activity. Long-baseline radio observations provide an acute tool for discriminating between these two mechanisms, and this technique has been applied to samples of Seyfert, starburst, and extremely luminous far-infrared galaxies (ELFs). Radio cores occur in about one-third of optically selected Seyferts, but are rare in optically selected starburst galaxies, confirming that the Seyferts are intrinsically different from starbursts. Radio cores occur in about one-third of ELFs with Seyfert-like spectra, but are rare otherwise. This implies that some ELFs are powered by quasar cores (and generally betray themselves as such by a Seyfert-like spectrum) but that others, including some of the most luminous ones, are not, and therefore require some other mechanism, such as superstarburst activity, to explain them.
Allen David A.
Kesteven Michael J.
Norris Ray P.
Sramek Richard A.
Troup Euan R.
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