Compact radio cores in extremely luminous far-infrared galaxies

Abstract

view Abstract Citations (77) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Compact Radio Cores in Extremely Luminous Far-Infrared Galaxies Norris, R. P. ; Allen, D. A. ; Sramek, R. A. ; Kesteven, M. J. ; Troup, E. R. 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. Publication: The Astrophysical Journal Pub Date: August 1990 DOI: 10.1086/169063 Bibcode: 1990ApJ...359..291N Keywords: Active Galaxies; Galactic Nuclei; Infrared Sources (Astronomy); Radio Sources (Astronomy); Seyfert Galaxies; Far Infrared Radiation; Luminosity; Quasars; Starburst Galaxies; Astrophysics; GALAXIES: NUCLEI; GALAXIES: SEYFERT; INFRARED: SOURCES; RADIO SOURCES: GALAXIES full text sources ADS | data products NED (161) SIMBAD (33)