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The environments of radio-loud AGN from the LOFAR Two-Metre Sky Survey (LoTSS)

Croston, J.H.; Hardcastle, M.J.; Mingo, B.; Best, P.N.; Sabater, J.; Shimwell, T.M.; Williams, W.L.; Rottgering, H.J.A.; Brienza, M.; Gurkan, G.; Ineson, J.; Miley, G.K.; Morabito, L.M.; O'Sullivan, S.P. and Prandoni, I. (2019). The environments of radio-loud AGN from the LOFAR Two-Metre Sky Survey (LoTSS). Astronomy & Astrophysics, 622, article no. A10.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201834019
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Abstract

An understanding of the relationship between radio-loud active galaxies and their large-scale environments is essential for realistic modelling of radio-galaxy evolution and environmental impact, for understanding AGN triggering and life cycles, and for calibrating galaxy feedback in cosmological models. We use the LOFAR Two-Metre Sky Survey (LoTSS) Data Release 1 catalogues to investigate this relationship. We cross-matched a sample of 8,745 radio-loud AGN with 0.08 < z < 0.4, selected from LoTSS, with two Sloan Digital Sky Survey (SDSS) cluster catalogues, and find that only 10 percent of LoTSS AGN in this redshift range have a high-probability association, so that the majority of low-redshift AGN (including a substantial fraction of the most radio-luminous objects) must inhabit haloes with M < 1014 M. We find that the probability of a cluster association, and the richness of the associated cluster, is correlated with AGN radio luminosity, and we also find that, for the cluster population, the number of associated AGN and the radio luminosity of the brightest associated AGN is richness-dependent. We demonstrate that these relations are not driven solely by host-galaxy stellar mass, supporting models in which large-scale environment is influential in driving AGN jet activity in the local Universe. At the lowest radio luminosities we find that the minority of objects with a cluster association are located at larger mean cluster-centre distances than more luminous AGN, an effect that appears to be driven primarily by host-galaxy mass. Finally, we also find that FRI radio galaxies inhabit systematically richer environments than FRIIs, consistent with previous work. The work presented here demonstrates the potential of LoTSS for AGN environmental studies. In future, the full northern-sky LoTSS catalogue, together with the use of deeper optical/IR imaging data and spectroscopic follow-up with WEAVE-LOFAR, will provide opportunities to extend this type of work to much larger samples and higher redshifts.

Item Type: Journal Item
Copyright Holders: 2019 ESO
ISSN: 1432-0746
Project Funding Details:
Funded Project NameProject IDFunding Body
Jet energy injection in galaxy groups and clusters - transfer of CG funding (Transfer in)ST/R00109X/1STFC (Science & Technology Facilities Council)
Jet physics and impact via LOFAR extragalactic surveysST/R000794/1STFC (Science & Technology Facilities Council)
Keywords: Galaxies: jets; Galaxies: clusters: general; Radio continuum: galaxies
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Astronomy
Item ID: 57842
Depositing User: Judith Croston
Date Deposited: 27 Nov 2018 10:45
Last Modified: 18 Nov 2019 01:27
URI: http://oro.open.ac.uk/id/eprint/57842
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