Advection-dominated Accretion, Jets And The Spectral Energy Distributions Of Low-luminosity AGNs In Liners

Details Advection-dominated Accretion, Jets And The Spectral Energy Distributions Of Low-luminosity AGNs In Liners Advection-dominated Accretion, Jets And The Spectral Energy Distributions Of Low-luminosity AGNs In Liners

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535905n&link_type=abstract

American Astronomical Society, AAS Meeting #215, #359.05; Bulletin of the American Astronomical Society, Vol. 42, p.546

Physics

Scientific paper

Low-luminosity active galactic nuclei (LLAGNs) represent the bulk of the AGN population in the present-day universe and they trace the low-level accreting supermassive black holes. The observational properties of LLAGNs have been interpreted to indicate that their central engines are intrinsically different from those of more luminous AGNs. It has been suggested that accretion in LLAGNs occurs via an advection-dominated accretion flow (ADAF) associated with strong jets. In order to probe the accretion physics in LLAGNs as a class, we model the multiwavelength SEDs of 24 LINERs (taken from a recent compilation by Eracleous et al.) with a coupled accretion-jet model. The accretion flow is modeled as an inner ADAF outside of which there is a truncated standard thin disk. These SEDs include radio, near-IR to near-UV HST data, and Chandra X-ray data. We find that the radio emission is severely underpredicted by ADAF models but can be explained by the relativistic jet. The origin of the X-ray radiation in most sources can be explained by three distinct scenarios: the X-rays can be dominated by emission from the ADAF, or the jet, or the X-rays can arise from a jet-ADAF combination in which both components contribute to the emission with similar importance. From the model fits, we estimate important parameters of the central engine of LINERs, such as the mass accretion rate - important for studies of the feeding of AGNs - and the mass-loss rate in the jet and the jet power - relevant for studies of the kinetic feedback from jets.

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