Advection-dominated accretion, jets, and the spectral energy distribution of LINERs

Rodrigo S. Nemmen, Thaisa Storchi-Bergmann, Michael Eracleous, Feng Yuan

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Low-luminosity active galactic nuclei (LLAGNs) represent the bulk of the AGN population in the present-day universe and they trace low-level accreting supermassive black holes. The observational properties of LLAGNs suggest 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 spectral energy distributions (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, the jet, or from both components contributing at similar levels. From the model fits, we estimate important parameters of the central engine of LINERs, such as the mass accretion rate - relevant 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.

Original languageEnglish (US)
Pages (from-to)313-318
Number of pages6
JournalProceedings of the International Astronomical Union
Volume5
Issue numberS267
DOIs
StatePublished - Aug 1 2009

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spectral energy distribution
advection
accretion
energy
active galactic nuclei
luminosity
engines
engine
radio
distribution
x rays
radio emission
physics
universe
probe
kinetics
probes
radiation
estimates

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Nemmen, Rodrigo S. ; Storchi-Bergmann, Thaisa ; Eracleous, Michael ; Yuan, Feng. / Advection-dominated accretion, jets, and the spectral energy distribution of LINERs. In: Proceedings of the International Astronomical Union. 2009 ; Vol. 5, No. S267. pp. 313-318.
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Advection-dominated accretion, jets, and the spectral energy distribution of LINERs. / Nemmen, Rodrigo S.; Storchi-Bergmann, Thaisa; Eracleous, Michael; Yuan, Feng.

In: Proceedings of the International Astronomical Union, Vol. 5, No. S267, 01.08.2009, p. 313-318.

Research output: Contribution to journalArticle

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