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Molecular Line Observations in Two Dusty Star-forming Galaxies at z = 6.9
- Source :
- apj, apj, 2021, 921 (1), pp.97. ⟨10.3847/1538-4357/ac21db⟩, Jarugula, S, Vieira, J D, Weiss, A, Spilker, J S, Aravena, M, Archipley, M, Béthermin, M, C. Chapman, S, Dong, C, Greve, T R, Harrington, K, Hayward, C C, Hezaveh, Y, Hill, R, Litke, K C, Malkan, M A, Marrone, D P, Narayanan, D, Phadke, K A, Reuter, C & Rotermund, K M 2021, ' Molecular Line Observations in Two Dusty Star-forming Galaxies at z = 6.9 ', Astrophysical Journal, vol. 921, no. 1, 97 . https://doi.org/10.3847/1538-4357/ac21db
- Publication Year :
- 2021
- Publisher :
- American Astronomical Society, 2021.
-
Abstract
- SPT0311-58 is the most massive infrared luminous system discovered so far during the Epoch of Reionization (EoR). In this paper, we present a detailed analysis of the molecular interstellar medium at z = 6.9, through high-resolution observations of the CO(6-5), CO(7-6), CO(10-9), [CI](2-1), and p-H2O(211-202) lines and dust continuum emission with the Atacama Large Millimeter/submillimeter Array (ALMA). The system consists of a pair of intensely star-forming gravitationally lensed galaxies (labelled West and East). The intrinsic far-infrared luminosity is (16 $\pm$ 4)$\times\rm 10^{12} \ \rm L_{\odot}$ in West and (27 $\pm$ 4)$\times\rm 10^{11} \ \rm L_{\odot}$ in East. We model the dust, CO, and [CI] using non-local thermodynamic equilibrium radiative transfer models and estimate the intrinsic gas mass to be (5.4 $\pm$ 3.4)$\times\rm 10^{11} \ \rm M_{\odot}$ in West and (3.1 $\pm$ 2.7)$\times\rm 10^{10} \ \rm M_{\odot}$ in East. We find that the CO spectral line energy distribution in West and East are typical of high-redshift sub-millimeter galaxies (SMGs). The CO-to-H2 conversion factor ($\alpha_{CO}$) and the gas depletion time scales estimated from the model are consistent with the high-redshift SMGs in the literature within the uncertainties. We find no evidence of evolution of depletion time with redshift in SMGs at z > 3. This is the most detailed study of molecular gas content of a galaxy in the EoR to-date, with the most distant detection of H2O in a galaxy without any evidence for active galactic nuclei in the literature.<br />Comment: Accepted for publication in The Astrophysical Journal. 34 pages, 17 figures
- Subjects :
- Physics
Molecular line
010308 nuclear & particles physics
Ultraluminous infrared galaxies
FOS: Physical sciences
Starburst galaxies
Astronomy and Astrophysics
Astrophysics
Star (graph theory)
Astrophysics - Astrophysics of Galaxies
01 natural sciences
Galaxy
13. Climate action
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
0103 physical sciences
High-redshift galaxies
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
010303 astronomy & astrophysics
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 921
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....2cb7cce5999fa3b7d54fbaab488af6d8