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Title: MRC B0319-454: probing the large-scale structure with a giant radio galaxy
Authors: Safouris, V.
Subrahmanyan, Ravi
Bicknell, G.V.
Saripalli, Lakshmi
Keywords: galaxies: active
galaxies: individual: MRC B0319−454
intergalactic medium
galaxies: jets
radio continuum: galaxies
Issue Date: Feb-2009
Publisher: Blackwell Publishing for the RAS
Citation: Monthly Notices of the Royal Astronomical Society, 2009, Vol. 393(1), p2-20
Abstract: We present an investigation of the relationships between the radio properties of a giant radio galaxy MRC B0319−454 and the surrounding galaxy distribution with the aim of examining the influence of intergalactic gas and gravity associated with the large-scale structure on the evolution in the radio morphology. Our new radio continuum observations of the radio source, with high surface brightness sensitivity, images the asymmetries in the megaparsec-scale radio structure in total intensity and polarization. We compare these with the three-dimensional galaxy distribution derived from galaxy redshift surveys. Galaxy density gradients are observed along and perpendicular to the radio axis: the large-scale structure is consistent with a model wherein the galaxies trace the ambient intergalactic gas and the evolution of the radio structures are ram-pressure limited by this associated gas. Additionally, we have modelled the off-axis evolution of the south-west radio lobe as deflection of a buoyant jet backflow by a transverse gravitational field: the model is plausible if entrainment is small. The case study presented here is a demonstration that giant radio galaxies may be useful probes of the warm-hot intergalactic medium believed to be associated with moderately over dense galaxy distributions.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0035-8711
1365-2966 (Online)
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Copyright: 2009 The Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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