The clustering of galaxies around radio-loud active Galactic nuclei

Hauke Worpel, Michael J I Brown, D. Heath Jones, David J E Floyd, Florian Beutler

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16 Citations (Scopus)
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We examine the hypothesis that mergers and close encounters between galaxies can fuel active galactic nuclei (AGNs) by increasing the rate at which gas accretes toward the central black hole. We compare the clustering of galaxies around radio-loud AGNs with the clustering around a population of radio-quiet galaxies with similar masses, colors, and luminosities. Our catalog contains 2178 elliptical radio galaxies with flux densities greater than 2.8 mJy at 1.4 GHz from the Six Degree Field Galaxy Survey. We find tentative evidence that radio AGNs with more than 200 times the median radio power have, on average, more close (r < 160 kpc) companions than their radio-quiet counterparts, suggesting that mergers play a role in forming the most powerful radio galaxies. For ellipticals of fixed stellar mass, the radio power is neither a function of large-scale environment nor halo mass, consistent with the radio powers of ellipticals varying by orders of magnitude over billions of years.

Original languageEnglish
Article number64
Pages (from-to)1-10
Number of pages10
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 20 Jul 2013
Externally publishedYes

Bibliographical note

Copyright 2013 The American Astronomical Society. First published in the Astrophysical Journal, 772(1), 64, 2013. The original publication is available at, published by IOP Publishing. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


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