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PKS 2250–351: A giant radio galaxy in Abell 3936

Published online by Cambridge University Press:  25 March 2020

N. Seymour
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia
M. Huynh
Affiliation:
CSIRO Astronomy and Space Science, 26 Dick Perry Avenue, Kensington, WA6151, Australia International Centre for Radio Astronomy Research, M468, University of Western Australia, Crawley, WA6009, Australia
S. S. Shabala
Affiliation:
School of Natural Sciences, University of Tasmania, Private Bag 37, Hobart, TAS7001, Australia
J. Rogers
Affiliation:
School of Natural Sciences, University of Tasmania, Private Bag 37, Hobart, TAS7001, Australia
L. J. M. Davies
Affiliation:
International Centre for Radio Astronomy Research, M468, University of Western Australia, Crawley, WA6009, Australia
R. J. Turner
Affiliation:
School of Natural Sciences, University of Tasmania, Private Bag 37, Hobart, TAS7001, Australia
A. O’Brien
Affiliation:
CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW1710, Australia
C. H. Ishwara-Chandra
Affiliation:
National Centre for Radio Astrophysics, TIFR, Post Bag No. 3, Ganeshkhind Post, 411007Pune, India
J. E. Thorne
Affiliation:
International Centre for Radio Astronomy Research, M468, University of Western Australia, Crawley, WA6009, Australia
T. J. Galvin
Affiliation:
CSIRO Astronomy and Space Science, 26 Dick Perry Avenue, Kensington, WA6151, Australia
T. Jarrett
Affiliation:
Astronomy Department, University of Cape Town, Private Bag X3, Rondebosch7701, South Africa
H. Andernach
Affiliation:
Departamento de Astronomía, DCNE, Universidad de Guanajuato, Apdo. Postal 144, Guanajuato, CP 36000, Gto., Mexico
C. Anderson
Affiliation:
CSIRO Astronomy and Space Science, 26 Dick Perry Avenue, Kensington, WA6151, Australia
J. Bunton
Affiliation:
CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW1710, Australia
K. Chow
Affiliation:
CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW1710, Australia
J. D. Collier
Affiliation:
Department of Astronomy, The Inter-University Institute for Data Intensive Astronomy (IDIA), University of Cape Town, Rondebosch7701, South Africa School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
S. Driver
Affiliation:
International Centre for Radio Astronomy Research, M468, University of Western Australia, Crawley, WA6009, Australia
M. D. Filipovic
Affiliation:
Department of Astronomy, The Inter-University Institute for Data Intensive Astronomy (IDIA), University of Cape Town, Rondebosch7701, South Africa
G. Gürkan
Affiliation:
CSIRO Astronomy and Space Science, 26 Dick Perry Avenue, Kensington, WA6151, Australia
A. M. Hopkins
Affiliation:
Faculty of Science and Engineering, Australian Astronomical Optics, AAO-Macquarie, Macquarie University, 105 Delhi Road, North Ryde, NSW2113, Australia
A. D. Kapińska
Affiliation:
National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM87801, USA
D. A. Leahy
Affiliation:
Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
J. Marvil
Affiliation:
National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM87801, USA
P. Manojlovic
Affiliation:
CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW1710, Australia School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
R. P. Norris
Affiliation:
CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW1710, Australia School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith, NSW2751, Australia
C. Phillips
Affiliation:
CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW1710, Australia
A. Robotham
Affiliation:
International Centre for Radio Astronomy Research, M468, University of Western Australia, Crawley, WA6009, Australia
L. Rudnick
Affiliation:
School of Physics and Astronomy, Minnesota Institute for Astrophysics, University of Minnesota, 116 Church Street SE, Minneapolis, MN55455, USA
V. Singh
Affiliation:
Astronomy and Astrophysics Division, Physical Research Laboratory, Ahmedabad380009, India
S. V. White
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA6102, Australia Department of Physics and Electronics, Rhodes University, P.O. Box 94, 6140Grahamstown, South Africa
Corresponding

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 IR 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-IR emission. Assuming it lies on the local M $\sigma$ relation, it has an Eddington accretion rate of $\lambda_{\rm EDD}\sim 0.014$ . 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 ( ${\sim} 300\,$ 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.

Type
Research Article
Copyright
© Astronomical Society of Australia 2020; published by Cambridge University Press

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PKS 2250–351: A giant radio galaxy in Abell 3936
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