eCite Digital Repository
Energetics and lifetimes of local radio active galactic nuclei
Citation
Turner, RJ and Shabala, SS, Energetics and lifetimes of local radio active galactic nuclei, The Astrophysical Journal, 806, (1) Article 59. ISSN 0004-637X (2015) [Refereed Article]
![]() | PDF 2Mb |
Copyright Statement
© 2015. The American Astronomical Society
DOI: doi:10.1088/0004-637X/806/1/59
Abstract
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.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | galaxies: active, jets, evolution, radio continuum: galaxies |
Research Division: | Physical Sciences |
Research Group: | Astronomical sciences |
Research Field: | Cosmology and extragalactic astronomy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS Author: | Turner, RJ (Dr Ross Turner) |
UTAS Author: | Shabala, SS (Associate Professor Stas Shabala) |
ID Code: | 100237 |
Year Published: | 2015 |
Funding Support: | Australian Research Council (DE130101399) |
Web of Science® Times Cited: | 77 |
Deposited By: | Mathematics and Physics |
Deposited On: | 2015-05-07 |
Last Modified: | 2020-12-02 |
Downloads: | 439 View Download Statistics |
Repository Staff Only: item control page