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Date and Time of the Query: 2019-08-20 T22:17:54 PDT
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For refcode 2001ApJ...555..650H:
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Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...555..650H Nuclear Luminosities and Radio Loudness of Seyfert Nuclei Luis C. Ho The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 and Chien Y. Peng Steward Observatory, University of Arizona, Tucson, AZ 85721 Received 2001 January 8; accepted 2001 March 1 ABSTRACT Historically, Seyfert nuclei have been considered to be radio-quiet active galactic nuclei (AGNs). We question this widely held assumption by showing that the distribution of the radio-to-optical luminosity ratio, R = L_{nu}_(6 cm)/L_{nu}_(B), when properly measured for the nuclear component, places the majority of type 1 Seyfert nuclei in the category of radio-loud AGNs, defined here as objects with R >= 10. This result is further strengthened by strong correlations found between radio power and optical continuum and emission-line luminosities, as has been established previously for more powerful AGNs. We also present a new calibration of the relation between optical continuum and Balmer emission-line luminosities valid in the regime of low-luminosity AGNs. Subject headings: galaxies: active-galaxies: nuclei-galaxies: Seyfert-radio continuum: galaxies
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