Jarvis, ME;
Harrison, CM;
Mainieri, V;
Rivera, GC;
Jethwa, P;
Zhang, Z-Y;
Alexander, DM;
... Thomson, AP; + view all
(2020)
High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets.
Monthly Notices of the Royal Astronomical Society
, 498
(2)
pp. 1560-1575.
10.1093/mnras/staa2196.
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Abstract
We use a sample of powerful z~0.1 type 2 quasars ('obscured'; log[L(AGN)/erg/s]>~45), which host kiloparsec-scale ionized outflows and jets, to identify possible signatures of AGN feedback on the total molecular gas reservoirs of their host galaxies. Specifically, we present Atacama Pathfinder EXperiment (APEX) observations of the CO(2-1) transition for nine sources and the CO(6-5) for a subset of three. We find that the majority of our sample reside in starburst galaxies (average specific star formation rates of 1.7/Gyr), with the seven CO-detected quasars also having large molecular gas reservoirs (average Mgas = 1.3x10^10Msun), even though we had no pre-selection on the star formation or molecular gas properties. Despite the presence of quasars and outflows, we find that the molecular gas fractions (Mgas/Mstar = 0.1-1.2) and depletion times (Mgas/SFR = 0.16-0.95Gyr) are consistent with those expected for the overall galaxy population with matched stellar masses and specific star formation rates. Furthermore, for at least two of the three targets with the required measurements, the CO(6-5)/CO(2-1) emission-line ratios are consistent with star formation dominating the CO excitation over this range of transitions. The targets in our study represent a gas-rich phase of galaxy evolution with simultaneously high levels of star formation and nuclear activity; furthermore, the jets and outflows do not have an immediate appreciable impact on the global molecular gas reservoirs.
| Type: | Article |
|---|---|
| Title: | High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/staa2196 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/staa2196 |
| Language: | English |
| Additional information: | Copyright © The Author 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | ISM: jets and outflows – ISM: molecules – galaxies: active – galaxies: evolution – galaxies: general – galaxies: ISM. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10112979 |
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