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Active galactic nucleus feedback drives the colour evolution of local galaxies


Shabala, SS and Kaviraj, S and Silk, J, Active galactic nucleus feedback drives the colour evolution of local galaxies, Monthly Notices of the Royal Astronomical Society, 413, (4) pp. 2815-2826. ISSN 1365-2966 (2011) [Refereed Article]

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Copyright © 2011. The definitive published version is available online at:

DOI: doi:10.1111/j.1365-2966.2011.18353.x


We investigate the effects of active galactic nucleus (AGN) feedback on the colour evolution of galaxies found in local (z < 0.2) groups and clusters. Galaxies located within the lobes of powerful Fanaroff–Riley type II (FR II) (edge-brightened) sources show much redder colours than neighbouring galaxies that are not spatially coincident with the radio source. By contrast, no similar effect is seen near FR I (core-dominated) radio sources.We show that these colours are consistent with FR II sources truncating star formation as the expanding bowshock overruns a galaxy. We examine a sample of clusters with no detectable radio emission and show that galaxy colours in these clusters carry an imprint of past AGN feedback. The AGN activity in the low-redshift Universe is predominantly driven by low-luminosity radio sources with short duty cycles. Our results show that, despite their rarity, feedback from powerful radio sources is an important driver of galaxy evolution even in the local volume.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active – galaxies: evolution – galaxies: photometry
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Astronomical sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
ID Code:72525
Year Published:2011
Web of Science® Times Cited:25
Deposited By:Mathematics and Physics
Deposited On:2011-08-29
Last Modified:2017-11-03

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