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Energetics and lifetimes of local radio active galactic nuclei

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journal contribution
posted on 2023-05-18, 09:40 authored by Ross TurnerRoss Turner, Stanislav ShabalaStanislav Shabala
We present a model describing the evolution of Fanaroff-Riley type I and II radio AGN, and the transition between these classes. We quantify galaxy environments using a semi-analytic galaxy formation model, and apply our model to a volume-limited low red shift (0.03 ≤ 𝓏 ≤ 0.1) sample of observed AGN to determine the distribution of jet powers and active lifetimes at the present epoch.Radio sources in massive galaxies are found to remain active for longer, spend less time in the quiescent phase, and inject more energy into their hosts than their less massive counterparts. The jet power is independent of the host stellar mass within uncertainties, consistent with maintenance-mode AGN feedback paradigm. The environments of these AGN are in or close to long-term heating-cooling balance. We also examine the properties of high- and low-excitation radio galaxy sub-populations.The HERGs are younger than LERGs by an order of magnitude, whilst their jet powers are greater by a factor of four. The Eddington-scaled accretion rates and jet production efficiencies of these populations are consistent with LERGs being powered by radiatively inefficient advection dominated accretion flows (ADAFs), while HERGs are fed by a radiatively efficient accretion mechanism.

Funding

Australian Research Council

History

Publication title

The Astrophysical Journal

Volume

806

Article number

59

Number

59

Pagination

1-18

ISSN

0004-637X

Department/School

School of Natural Sciences

Publisher

Institute of Physics Publishing, Inc.

Place of publication

United States

Rights statement

© 2015. The American Astronomical Society

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the physical sciences

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    University Of Tasmania

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