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

Cheale, RA; Geach, JE; Edge, AC; Perrott, YC; Cantwell, T

Abstract

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.

Citation

Cheale, R., Geach, J., Edge, A., Perrott, Y., & 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. https://doi.org/10.1093/mnrasl/sly161

• Journal Article Type: Article
• Acceptance Date: Aug 25, 2018
• Online Publication Date: Aug 31, 2018
• Publication Date: Aug 31, 2018
• Deposit Date: Sep 24, 2018
• Publicly Available Date: Oct 10, 2018
• Journal: Monthly Notices of the Royal Astronomical Society: Letters
• Electronic ISSN: 1745-3933
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 481
• Issue: 1
• Pages: L54-L58
• DOI: https://doi.org/10.1093/mnrasl/sly161
• Related Public URLs: https://arxiv.org/pdf/1809.01700.pdf