UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Multiwavelength Characterization of an ACT-selected, Lensed Dusty Star-forming Galaxy at z=2.64

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. Green open access

[thumbnail of Roberts-Borsani_2017_ApJ_844_110.pdf]
Preview
Text
Roberts-Borsani_2017_ApJ_844_110.pdf - Published version

Download (851kB) | Preview

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
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 > 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
Downloads since deposit
44Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item