PKS 2250$-$351: A Giant Radio Galaxy in Abell 3936. (arXiv:2001.08772v1 [astro-ph.GA])

PKS 2250$-$351: A Giant Radio Galaxy in Abell 3936. (arXiv:2001.08772v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Seymour_N/0/1/0/all/0/1">N. Seymour</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Huynh_M/0/1/0/all/0/1">M. Huynh</a> (2,3), <a href="http://arxiv.org/find/astro-ph/1/au:+Shabala_S/0/1/0/all/0/1">S.S. Shabala</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Rogers_J/0/1/0/all/0/1">J. Rogers</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+Davies_L/0/1/0/all/0/1">L.J.M. Davies</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Turner_R/0/1/0/all/0/1">R.J. Turner</a> (4), <a href="http://arxiv.org/find/astro-ph/1/au:+OBrien_A/0/1/0/all/0/1">A. O'Brien</a> (5), <a href="http://arxiv.org/find/astro-ph/1/au:+Ishwara_Chandra_C/0/1/0/all/0/1">C.H. Ishwara-Chandra</a> (6), <a href="http://arxiv.org/find/astro-ph/1/au:+Thorne_J/0/1/0/all/0/1">J.E. Thorne</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Galvin_T/0/1/0/all/0/1">T.J. Galvin</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Jarrett_T/0/1/0/all/0/1">T. Jarrett</a> (7), <a href="http://arxiv.org/find/astro-ph/1/au:+Andernach_H/0/1/0/all/0/1">H. Andernach</a> (8), <a href="http://arxiv.org/find/astro-ph/1/au:+Anderson_C/0/1/0/all/0/1">C. Anderson</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Bunton_J/0/1/0/all/0/1">J. Bunton</a> (5), <a href="http://arxiv.org/find/astro-ph/1/au:+Chow_K/0/1/0/all/0/1">K. Chow</a> (5), <a href="http://arxiv.org/find/astro-ph/1/au:+Collier_J/0/1/0/all/0/1">J.D. Collier</a> (9,10), <a href="http://arxiv.org/find/astro-ph/1/au:+Driver_S/0/1/0/all/0/1">S. Driver</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Filipovic_M/0/1/0/all/0/1">M. Filipovic</a> (9), <a href="http://arxiv.org/find/astro-ph/1/au:+Gurkan_G/0/1/0/all/0/1">G. Gürkan</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Hopkins_A/0/1/0/all/0/1">A. Hopkins</a> (11), <a href="http://arxiv.org/find/astro-ph/1/au:+Kapinska_A/0/1/0/all/0/1">A.D. Kapińska</a> (12), <a href="http://arxiv.org/find/astro-ph/1/au:+Leahy_D/0/1/0/all/0/1">D.A. Leahy</a> (13), <a href="http://arxiv.org/find/astro-ph/1/au:+Marvil_J/0/1/0/all/0/1">J. Marvil</a> (12), <a href="http://arxiv.org/find/astro-ph/1/au:+Manojlovic_P/0/1/0/all/0/1">P. Manojlovic</a> (10,5), <a href="http://arxiv.org/find/astro-ph/1/au:+Norris_R/0/1/0/all/0/1">R.P. Norris</a> (10,5), <a href="http://arxiv.org/find/astro-ph/1/au:+Phillips_C/0/1/0/all/0/1">C. Phillips</a> (5), <a href="http://arxiv.org/find/astro-ph/1/au:+Robotham_A/0/1/0/all/0/1">A. Robotham</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Rudnick_L/0/1/0/all/0/1">L. Rudnick</a> (14), <a href="http://arxiv.org/find/astro-ph/1/au:+Singh_V/0/1/0/all/0/1">V.S. Singh</a> (15), <a href="http://arxiv.org/find/astro-ph/1/au:+White_S/0/1/0/all/0/1">S.V. White</a> (1,16) ((1) ICRAR/Curtin University, (2) CSIRO Astronomy and Space Science, (3) ICRAR/UWA, (4) University of Tasmania, (5) CSIRO Astronomy and Space Science, (6) National Centre for Radio Astrophysics, (7) University of Cape Town, (8) Universidad de Guanajuato, (9) The Inter-University Institute for Data Intensive Astronomy, (10) Western Sydney University, (11) AAO-Macquarie, (12) National Radio Astronomy Observatory, (13) University of Calgary, (14) University of Minnesota, (15) Physical Research Laboratory, (16) Rhodes University)

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.

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