Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm

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We investigate how the total radio luminosity of AGN-powered radio sources depends on their accretion luminosity and the central black hole mass. We find that AGNs form two distinct and well separated sequences on the radio-loudness -- Eddington-ratio plane. We argue that these sequences mark the real upper bounds of radio-loudness of two distinct populations of AGNs: those hosted respectively by elliptical and disk galaxies. Both sequences show the same dependence of the radio-loudness on the Eddington ratio (an increase with decreasing Eddington ratio), which suggests that another parameter in addition to the accretion rate must play a role in ... continued below

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7 pages

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Stawarz, L.; Sikora, M. & Lasota, J.-P. October 15, 2007.

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We investigate how the total radio luminosity of AGN-powered radio sources depends on their accretion luminosity and the central black hole mass. We find that AGNs form two distinct and well separated sequences on the radio-loudness -- Eddington-ratio plane. We argue that these sequences mark the real upper bounds of radio-loudness of two distinct populations of AGNs: those hosted respectively by elliptical and disk galaxies. Both sequences show the same dependence of the radio-loudness on the Eddington ratio (an increase with decreasing Eddington ratio), which suggests that another parameter in addition to the accretion rate must play a role in determining the jet production efficiency in active galactic nuclei, and that this parameter is related to properties of the host galaxy. The revealed host-related radio dichotomy breaks down at high accretion rates where the dominant fraction of luminous quasars hosted by elliptical galaxies is radio quiet. We argue that the huge difference between the radio-loudness reachable by AGNs in disc and elliptical galaxies can be explained by the scenario according to which the spin of a black hole determines the outflows power, and central black holes can reach large spins only in early type galaxies (following major mergers), and not (in a statistical sense) in spiral galaxies.

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7 pages

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  • Presented at International Meeting on Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, Girdwood, Alaska, 21-24 May 2007

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  • Report No.: SLAC-PUB-12865
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 918016
  • Archival Resource Key: ark:/67531/metadc890901

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 15, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 6, 2016, 6:12 p.m.

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Stawarz, L.; Sikora, M. & Lasota, J.-P. Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm, article, October 15, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc890901/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.