The nature of the variable millimetre–selected AGN in the brightest cluster galaxy of Abell 851. (31st August 2018)

• Record Type: Journal Article
• Authors: Cheale, R A; Geach, J E; Edge, A C; Perrott, Y C; Cantwell, T
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 481:Number 1(2018:Nov.)
• Page Start: L54
• Page End: L58
• Publication Date: 2018-08-31
• Subjects: techniques: interferometric -- galaxies: clusters: individual: (A851, Cl 0939+4713) -- galaxies: clusters: individual: Abell 851 -- galaxies: elliptical and lenticular, cD -- galaxies: evolution; Astronomy -- Research -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnrasl/sly161
• Languages: English
• ISSNs: 1745-3933

Abstract

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–$100 {\mu {m}}$, 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.