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Radio Galaxy Zoo: observational evidence for environment as the cause of radio source asymmetry


Rodman, PE and Turner, RJ and Shabala, SS and Banfield, JK and Wong, OI and Andernach, H and Garon, AF and Kapinska, AD and Norris, RP and Rudnick, L, Radio Galaxy Zoo: observational evidence for environment as the cause of radio source asymmetry, Monthly Notices of the Royal Astronomical Society, 482, (4) pp. 5625-5641. ISSN 0035-8711 (2018) [Refereed Article]


Copyright Statement

Copyright 2018 The Authors. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society :2018. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnras/sty3070


We investigate the role of environment on radio galaxy properties by constructing a sample of large (≳100 kpc), nearby (𝓏 < 0.3) radio sources identified as part of the Radio Galaxy Zoo citizen science project. Our sample consists of 16 Fanaroff-Riley Type II (FR-II) sources, 6 FR-I sources, and 1 source with a hybrid morphology. FR-I sources appear to be hosted by more massive galaxies, consistent with previous studies. In the FR-II sample, we compare the degree of asymmetry in radio lobe properties to asymmetry in the radio source environment, quantified through optical galaxy clustering. We find that the length of radio lobes in FR-II sources is anticorrelated with both galaxy clustering and lobe luminosity. These results are in quantitative agreement with predictions from radio source dynamical models and suggest that galaxy clustering provides a useful proxy for the ambient gas density distribution encountered by the radio lobes.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active, galaxies: jets, 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:Rodman, PE (Miss Payton Rodman)
UTAS Author:Turner, RJ (Dr Ross Turner)
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
ID Code:130385
Year Published:2018
Funding Support:Australian Research Council (DE130101399)
Web of Science® Times Cited:9
Deposited By:Mathematics and Physics
Deposited On:2019-01-23
Last Modified:2019-03-13
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