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The nature of the variable millimetre–selected AGN in the brightest cluster galaxy of Abell 851.

Cheale, R.A. and Geach, J.E. and Edge, A.C. and Perrott, Y.C. and Cantwell, T. (2018) 'The nature of the variable millimetre–selected AGN in the brightest cluster galaxy of Abell 851.', Monthly notices of the Royal Astronomical Society : letters., 481 (1). L54-L58.


We present the detection of a bright 3 mm continuum source in the brightest cluster galaxy (BCG) in Abell 0851 (z = 0.411) with the NOrthern Extended Millimeter Array (NOEMA). When this detection is compared to other multifrequency observations across 21cm– 100μm, including new Arcminute Microkelvin Imager 15 GHz observations, we find evidence for a relatively flat, variable core source associated with the BCG. The radio power and amplitude of variability observed in this galaxy is consistent with the cores in lower redshift BCGs in X-ray–selected clusters, and the flat mm–cm spectrum is suggestive of the BCG being a low-luminosity active galactic nucleus archetype. The discovery of this system could provide a basis for a long-term study of the role of low-luminosity radio mode ‘regulatory’ feedback in massive clusters.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:25 August 2018
Date deposited:10 October 2018
Date of first online publication:31 August 2018
Date first made open access:10 October 2018

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