Ultra-bright CO and [{\rm{C}}\,{\rm{I}}] Emission in a Lensed z = 2.04 Submillimeter Galaxy with Extreme Molecular Gas Properties

Dannerbauer, H.; Harrington, K.; Díaz-Sánchez, A.; Iglesias-Groth, S.; Rebolo, R.; Genova-Santos, R. T.; Krips, M.
Referencia bibliográfica

The Astronomical Journal, Volume 158, Issue 1, article id. 34, 11 pp. (2019).

Fecha de publicación:
7
2019
Número de autores
7
Número de autores del IAC
4
Número de citas
30
Número de citas referidas
27
Descripción
We report the very bright detection of cold molecular gas with the IRAM NOEMA interferometer of the strongly lensed source WISE J132934.18+224327.3 at z = 2.04, the so-called Cosmic Eyebrow. This source has a similar spectral energy distribution from optical-mid/IR to submillimeter/radio but significantly higher fluxes than the well-known lensed SMG SMMJ 2135, the Cosmic Eyelash at z = 2.3. The interferometric observations unambiguously identify the location of the molecular line emission in two components, component CO32-A with {I}CO(3-2)}=52.2+/- 0.9 Jy km s‑1 and component CO32-B with {I}CO(3-2)}=15.7+/- 0.7 Jy km s‑1. Thus, our NOEMA observations of the CO(3‑2) transition confirm the SMG-nature of WISE J132934.18+224327.3, resulting in the brightest CO(3‑2) detection ever of an SMG. In addition, we present follow-up observations of the brighter component with the Green Bank Telescope (CO(1‑0) transition) and IRAM 30 m telescope (CO(4‑3) and [C I](1‑0) transitions). The star formation efficiency of ∼100 L ⊙/(K km s‑1 pc2) is at the overlap region between merger-triggered and disk-like star formation activity and the lowest seen for lensed dusty star-forming galaxies. The determined gas depletion time ∼60 Myr, intrinsic infrared star formation SFRIR ≈ 2000 M ⊙ yr‑1, and gas fraction M mol/M * = 0.44 indicate a starburst/merger-triggered star formation. The obtained data of the cold ISM—from CO(1‑0) and dust continuum—indicates a gas mass μM mol ∼ 15 × 1011 M ⊙ for component CO32-A. Its unseen brightness offers us the opportunity to establish the Cosmic Eyebrow as a new reference source at z = 2 for galaxy evolution.
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