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Lookup NU author(s): Dr Chris HarrisonORCiD, Aishwarya Girdhar
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.We present a comprehensive study of the molecular gas properties of 17 Type 2 quasars at z < 0.2 from the Quasar Feedback Survey (L > 1042.1), selected by their high [O iii] luminosities and displaying a large diversity of radio jet properties, but dominated by LIRG-like galaxies. With these data, we are able to investigate the impact of AGN and AGN feedback mechanisms on the global molecular interstellar medium. Using Atacama Pathfinder EXperiment and ALMA ACA observations, we measure the total molecular gas content using the CO(1-0) emission and homogeneously sample the carbon monoxide (CO) spectral line energy distributions, observing CO transitions (Jup = 1, 2, 3, 6, 7). We observe high r21 ratios (r21 = L'CO(2-1)/L'CO(1-0)) with a median r21 = 1.06, similar to local (U)LIRGs (with r21 ∼1) and higher than normal star-forming galaxies (with r21 ∼0.65). Despite the high r21 values, for the seven targets with the required data, we find low excitation in CO(6-5) & CO(7-6) (r61 and r62 < 0.6 in all but one target), unlike high-redshift quasars in the literature, which are far more luminous and show higher line ratios. The ionized gas traced by [O iii] exhibits systematically higher velocities than the molecular gas traced by CO. We conclude that any effects of quasar feedback (e.g. via outflows and radio jets) do not have a significant instantaneous impact on the global molecular gas content and excitation and we suggest that it only occurs on more localized scales.
Author(s): Molyneux SJ, Calistro Rivera G, De Breuck C, Harrison CM, Mainieri V, Lundgren A, Kakkad D, Circosta C, Girdhar A, Costa T, Mullaney JR, Kharb P, Arrigoni Battaia F, Farina EP, Alexander DM, Ward SR, Silpa S, Smit R
Publication type: Article
Publication status: Published
Journal: Monthly Notices of the Royal Astronomical Society
Year: 2024
Volume: 527
Issue: 3
Pages: 4420-4439
Online publication date: 13/10/2023
Acceptance date: 10/10/2023
Date deposited: 15/08/2024
ISSN (print): 0035-8711
ISSN (electronic): 1365-2966
Publisher: Oxford University Press
URL: https://doi.org/10.1093/mnras/stad3133
DOI: 10.1093/mnras/stad3133
Data Access Statement: The data used in this work are available from the ESO Science Archive Facility (https://archive.eso.org/). The reduced data underlying this paper will be shared on reasonable request to the corresponding author. Data are also available at Newcastle University’s data repository (https://doi.org/10.25405/data.ncl.24312502) and can also be accessed through the QFeedS website. Specifically, all tablesin digitalformat and .fits files ofthe spectra will be available. Further, all spectra and tables of data listing the CO properties are available in the supplementary material.
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