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A negative correlation between RUV and αox in low-luminosity AGNs

Published online by Cambridge University Press:  07 April 2020

Shuang-Liang Li
Shuang-Liang Li*
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai200030, China email: lisl@shao.ac.cn
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Abstract

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It has been controversial for years that the accretion mode is different for bright active galactic nuclei (AGNs) and low-luminosity AGNs (LLAGNs). In this work, we compile from literature a sample of 32 LLAGNs, consisting 18 LINERs and 14 low Eddington ratio (λ) Seyfert galaxies. A strong negative correlation between the radio loudness RUV and the optical to X-ray spectral index αox is reported for the first time. We further demonstrate that this negative correlation can be understood consistently and comprehensively under the truncated accretion — jet model, a model that has been applied successfully to LLAGNs. We argue that the scatter in the observations is mainly due to the spread in the viscosity parameter α of a hot accretion flow, a parameter that can potentially serve as a diagnosis of the strength and/or configuration of magnetic fields in accretion flows.

Keywords

accretion, accretion discsblack hole physicsgalaxies: activegalaxies: Seyfert
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S342: Perseus in Sicily: From Black Hole to Cluster Outskirts , May 2018 , pp. 248 - 249
Copyright
© International Astronomical Union 2020

References

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