NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-24 T14:48:30 PDT
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For refcode 1990ApJ...359..291N:
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Copyright by American Astronomical Society. Reproduced by permission
1990ApJ...359..291N COMPACT RADIO CORES IN EXTREMELY LUMINOUS FAR-INFRARED GALAXIES R. P. NORRIS Australia Telescope National Facility D. A. ALLEN Anglo-Australian Telescope R. A. SRAMEK Australia Telescope National Facility and National Radio Astronomy Observatory AND M. J. KESTEVEN AND E. R. TROUP Australia Telescope National Facility Received 1989 November 2; accepted 1990 February 22 ABSTRACT 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 we have applied this technique to samples of Seyfert, starburst, and extremely luminous far-infrared galaxies (ELFs). We find that (1) 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, and (2) 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. Subject headings: galaxies: nuclei - galaxies: Seyfert - infrared: sources - radio sources: galaxies
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