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Lookup NU author(s): Dr Chris HarrisonORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 The Author(s).Some active galactic nuclei (AGN) host outflows which have the potential to alter the host galaxy's evolution (AGN feedback). These outflows have been linked to enhanced radio emission. Here, we investigate the connection between low-frequency radio emission using the international LOw Frequency ARray (LOFAR) telescope and [O iii] 5007 ionized gas outflows using the Sloan Digital Sky Survey. Using the LOFAR Two-metre Sky Survey (LoTSS) Deep Fields, we select 198 AGN with optical spectra, 115 of which are detected at 144 MHz, and investigate their low-frequency radio emission properties. The majority of our sample do not show a radio excess when considering radio luminosity - star formation rate relationship, and are therefore not driven by powerful jets. We extract the [O iii] 5007 kinematics and remove AGN luminosity dependencies by matching the radio detected and non-detected AGN in and redshift. Using both spectral fitting and measurements, we find radio detected AGN have a higher outflow rate (67.2 3.4 per cent) than the radio non-detected AGN (44.6 2.7 per cent), indicating a connection between ionized outflows and the presence of radio emission. For spectra where there are two components of the [O iii] emission line present, we normalize all spectra by the narrow component and find that the average broad component in radio detected AGN is enhanced compared to the radio non-detected AGN. This could be a sign of higher gas content, which is suggestive of a spatial relationship between [O iii] outflows and radio emission in the form of either low-powered jets or shocks from AGN winds.
Author(s): Escott EL, Morabito LK, Scholtz J, Hickox RC, Harrison CM, Alexander DM, Arnaudova MI, Smith DJB, Duncan KJ, Petley J, Kondapally R, Rivera GC, Kolwa S
Publication type: Article
Publication status: Published
Journal: Monthly Notices of the Royal Astronomical Society
Year: 2025
Volume: 536
Issue: 2
Pages: 1166-1179
Print publication date: 01/01/2025
Online publication date: 27/11/2024
Acceptance date: 21/11/2024
Date deposited: 09/09/2025
ISSN (print): 0035-8711
ISSN (electronic): 1365-2966
Publisher: Oxford University Press
URL: https://doi.org/10.1093/mnras/stae2645
DOI: 10.1093/mnras/stae2645
Data Access Statement: The target catalogue with derived properties of our sample will be available on CDS on publication. Spectral fitting results will be made available upon request. The deep radio data used in this paper are from the LoTSS Deep Fields Data Release 1 which is presented in Tasse et al. (2021). The data are made publicly available through the LOFAR Surveys website (https://lofar-surveys.org/deepfields.html). We use the SDSS Quasar catalogue from DR16 which can be accessed at https://www.sdss4.org/dr17/algorithms/qso catalog/ and the broad-line AGN catalogue from SDSS DR7 which can be found at http://cdsarc.u-strasbg.fr/cgi-bin/ftp-index?/ftp/cats/J/ ApJS/243/21. The SDSS spectra used in the spectral fitting can be downloaded from https://dr14.sdss.org/optical/spectrum/search by uploading the source’s location or plate information.
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