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RAiSE X: searching for radio galaxies in X-ray surveys

Citation

Turner, RJ and Shabala, SS, RAiSE X: searching for radio galaxies in X-ray surveys, Monthly Notices of the Royal Astronomical Society, 493, (4) Article staa702. ISSN 0035-8711 (2020) [Refereed Article]


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Copyright Statement

Copyright 2020 The Authors. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society : 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnras/staa702

Abstract

We model the X-ray surface brightness distribution of emission associated with Fanaroff & Riley type-II radio galaxies. Our approach builds on the RAiSE dynamical model which describes broadband radio-frequency synchrotron evolution of jet-inflated lobes in a wide range of environments. The X-ray version of the model presented here includes: (1) inverse-Compton upscattering of cosmic microwave background radiation; (2) the dynamics of the shocked gas shell and associated bremsstrahlung radiation; and (3) emission from the surrounding ambient medium. We construct X-ray surface brightness maps for a mock catalogue of extended FR-IIs based on the technical characteristics of the eRosita telescope. The integrated X-ray luminosity function at low redshifts (z ≤ 1) is found to strongly correlate with the density of the ambient medium in all but the most energetic sources, whilst at high-redshift (z > 1) the majority of objects are dominated by inverse-Compton lobe emission due to the stronger cosmic microwave background radiation. By inspecting our mock spatial brightness distributions, we conclude that any extended X-ray detection can be attributed to AGN activity at redshifts z ≥ 1. We compare the expected detection rates of active and remnant high-redshift radio AGNs for eRosita and LOFAR, and future more sensitive surveys. We find that a factor of ten more remnants can be detected using X-ray wavelengths over radio frequencies at z > 2.2, increasing to a factor of 100 for redshifts z > 3.1.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active galaxies: jets radio continuum: galaxies X-rays: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Turner, RJ (Dr Ross Turner)
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
ID Code:137973
Year Published:2020
Web of Science® Times Cited:4
Deposited By:Physics
Deposited On:2020-03-17
Last Modified:2020-06-17
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