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Croston, J.H.; Ineson, J.; Hardcastle, M. J. and Mingo, B.
(2017).
DOI: https://doi.org/10.1093/mnras/stx1347
Abstract
We describe a new method for identifying and characterizing the thermodynamic state of large samples of evolved galaxy groups at high redshifts using high-resolution, low-frequency radio surveys, such as those that will be carried out with LOFAR and the Square Kilometre Array (SKA). We identify a sub-population of morphologically regular powerful (FRII) radio galaxies and demonstrate that, for this sub-population, the internal pressure of the radio lobes is a reliable tracer of the external intragroup/intracluster medium (ICM) pressure, and that the assumption of a universal pressure profile for relaxed groups enables the total mass and X-ray luminosity to be estimated. Using a sample of well-studied FRII radio galaxies, we demonstrate that our method enables the estimation of group/cluster X-ray luminosities over three orders of magnitude in luminosity to within a factor of ∼2 from low-frequency radio properties alone. Our method could provide a powerful new tool for building samples of thousands of evolved galaxy groups at z > 1 and characterizing their ICM.
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About
- Item ORO ID
- 49572
- Item Type
- Journal Item
- ISSN
- 1365-2966
- Project Funding Details
-
Funded Project Name Project ID Funding Body Not Set ST/M001326/1 STFC (Science & Technology Facilities Council) Not Set ST/M001008/1 STFC (Science & Technology Facilities Council) - Keywords
- galaxies: active; X-rays: galaxies: clusters
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2017 The Authors
- Depositing User
- Judith Croston