PKS 2250$-$351: A Giant Radio Galaxy in Abell 3936

Abstract

We present a detailed analysis of the radio galaxy PKS 2250-351, a giant of 1.2 Mpc projected size, its host galaxy, and its environment. We use radio data from the Murchison Widefield Array, the upgraded Giant Metre-wavelength Radio Telescope, the Australian Square Kilometre Array Pathfinder, and the Australia Telescope Compact Array to model the jet power and age. Optical and infra-red data come from the Galaxy And Mass Assembly (GAMA) survey and provide information on the host galaxy and environment. GAMA spectroscopy confirms that PKS 2250-351 lies at z=0.2115 in the irregular, and likely unrelaxed, cluster Abell 3936. We find its host is a massive, `red and dead' elliptical galaxy with negligible star formation but with a highly obscured active galactic nucleus dominating the mid-infrared emission. Assuming it lies on the local M-sigma relation it has an Eddington accretion rate of lambda_EDD~0.014. We find that the lobe-derived jet power (a time-averaged measure) is an order of magnitude greater than the hotspot-derived jet power (an instantaneous measure). We propose that over the lifetime of the observed radio emission (~300 Myr) the accretion has switched from an inefficient advection dominated mode to a thin-disc efficient mode, consistent with the decrease in jet power. We also suggest that the asymmetric radio morphology is due to its environment, with the host of PKS 2250-351 lying to the west of the densest concentration of galaxies in Abell 3936.

16 pages and 8 figures, accepted for publication in PASA

References in corpus (13)

• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• The Star Formation History of the Universe as Revealed by Deep Radio Observations
• Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies
• The duty cycle of local radio galaxies
• The Energetics and Lifetimes of Local Radio Active Galactic Nuclei
• Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
• The Spitzer mid-infrared AGN survey. II-the demographics and cosmic evolution of the AGN population
• RAiSE III: 3C radio AGN energetics and composition
• RAiSE II: resolved spectral evolution in radio AGN
• Recalibrating the Wide-field Infrared Survey Explorer (WISE) W4 Filter
• Delayed triggering of radio Active Galactic Nuclei in gas-rich minor mergers in the local Universe
• A new method for finding and characterizing galaxy groups via low-frequency radio surveys

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