Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

The Quasar Feedback Survey: characterizing CO excitation in quasar host galaxies

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 and Smit, R (2023) The Quasar Feedback Survey: characterizing CO excitation in quasar host galaxies. Monthly Notices of the Royal Astronomical Society, 527 (3). pp. 4420-4439. ISSN 0035-8711

The Quasar Feedback Survey characterizing CO excitation in quasar host galaxies.pdf - Published Version
Available under License Creative Commons Attribution.

Download (2MB) | Preview


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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
SWORD Depositor: A Symplectic
Date Deposited: 22 Jan 2024 10:42
Last Modified: 22 Jan 2024 10:45
DOI or ID number: 10.1093/mnras/stad3133
URI: https://researchonline.ljmu.ac.uk/id/eprint/22421
View Item View Item