NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:36:46 PDT
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For refcode 2002ApJ...564..120H:
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2002ApJ...564..120H On the Relationship between Radio Emission and Black Hole Mass in Galactic Nuclei Luis C. Ho The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 Received 2001 April 17; accepted 2001 September 17 ABSTRACT We use a comprehensive database of black hole masses (M_BH_) and nuclear luminosities to investigate the relationship between radio emission and M_BH_. Our sample covers a wide range of nuclear activity, from nearby inactive nuclei to classical Seyfert 1 nuclei and luminous quasars. Contrary to some previous studies, we find that the radio continuum power, either integrated for the entire galaxy or isolated for the core, correlates poorly with MBH. The degree of nuclear radio loudness, parameterized by the radio-to-optical luminosity ratio R, also shows no clear dependence on M_BH_. Radio-loud nuclei exist in galaxies with a wide range of M_BH_, from ~10^6^ to a few times 10^9^ M_sun_, and in a variety of hosts, from disk-dominated spiral to giant elliptical galaxies. We demonstrate that R is strongly inversely correlated with L/L_E_, the ratio of nuclear luminosity to the Eddington luminosity, and hence with the mass accretion rate. Most or all of the weakly active nuclei in nearby galaxies are radio-loud, highly sub-Eddington systems that are plausibly experiencing advection-dominated accretion. Subject headings: black hole physics - galaxies: active - galaxies: nuclei - galaxies: Seyfert - quasars: general - radio continuum: galaxies
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