The variability of brightest cluster galaxies at high radio frequencies

ABSTRACT Variability of a galaxy’s core radio source can be significant consequence active galactic nucleus accretion. However, this variability has not been well studied, particularly at high frequencies. As such, we report on campaign monitoring the frequency 20 nearby, cool-core brightest cluster galaxies. From our representative sample, show that most vary significantly time-scales approximately 1 yr and longer. Our highest cadence observations are 15 GHz from Owens Valley Radio Observatory. They have median time interval 7 d mostly span between 8 13 yr. We apply range detection techniques to sources’ light curves analyse changes week decade long time-scales. Most notably, least half sources per cent peak trough 3 time-scales, while third by 60 6 Significant variability, which is important studies Sunyaev–Zel’dovich Effect in radio/sub-mm, therefore common feature these sources. also how relates spectral properties frequencies up 353 using data Korean VLBI network, NIKA2 instrument IRAM 30-m telescope, SCUBA-2 James Clerk Maxwell Telescope.