Roberts-Borsani, GW;
Jimenez-Donaire, MJ;
Dapra, M;
Alatalo, K;
Aretxaga, I;
Alvarez-Marquez, J;
Baker, AJ;
... Yun, MS; + view all
(2017)
Multiwavelength Characterization of an ACT-selected, Lensed Dusty Star-forming Galaxy at z=2.64.
The Astrophysical Journal
, 844
(2)
10.3847/1538-4357/aa7aa8.
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Abstract
We present C I(2–1) and multi-transition 12CO observations of a dusty star-forming galaxy, ACT J2029+0120, which we spectroscopically confirm to lie at z = 2.64. We detect CO(3–2), CO(5–4), CO(7–6), CO(8–7), and C I (2–1) at high significance, tentatively detect HCO+(4–3), and place strong upper limits on the integrated strength of dense gas tracers (HCN(4–3) and CS(7–6)). Multi-transition CO observations and dense gas tracers can provide valuable constraints on the molecular gas content and excitation conditions in high-redshift galaxies. We therefore use this unique data set to construct a CO spectral line energy distribution (SLED) of the source, which is most consistent with that of a ULIRG/Seyfert or QSO host object in the taxonomy of the Herschel Comprehensive ULIRG Emission Survey. We employ RADEX models to fit the peak of the CO SLED, inferring a temperature of T ∼ 117 K and nH 105 2 ~ cm−3 , most consistent with a ULIRG/QSO object and the presence of high-density tracers. We also find that the velocity width of the C I line is potentially larger than seen in all CO transitions for this object, and that the LC 2 1 CO 3 2 ¢ ¢ i() () - - L ratio is also larger than seen in other lensed and unlensed submillimeter galaxies and QSO hosts; if confirmed, this anomaly could be an effect of differential lensing of a shocked molecular outflow.
Type: | Article |
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Title: | Multiwavelength Characterization of an ACT-selected, Lensed Dusty Star-forming Galaxy at z=2.64 |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.3847/1538-4357/aa7aa8 |
Publisher version: | http://doi.org/10.3847/1538-4357/aa7aa8 |
Language: | English |
Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | galaxies: evolution, galaxies: high-redshift, ISM: jets and outflows, radio lines: galaxies |
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 |
URI: | https://discovery.ucl.ac.uk/id/eprint/10037820 |
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