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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: | 6 |
| Deposited By: | Physics |
| Deposited On: | 2020-03-17 |
| Last Modified: | 2020-06-17 |
| Downloads: | 17 View Download Statistics |
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