Molecular Line Observations in Two Dusty Star-forming Galaxies at z =6.9
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Molecular Line Observations in Two Dusty Star-forming Galaxies at z =6.9. / Jarugula, Sreevani; Vieira, Joaquin D.; Weiss, Axel; Spilker, Justin S.; Aravena, Manuel; Archipley, Melanie; Bethermin, Matthieu; C. Chapman, Scott; Dong, Chenxing; Greve, Thomas R.; Harrington, Kevin; Hayward, Christopher C.; Hezaveh, Yashar; Hill, Ryley; Litke, Katrina C.; Malkan, Matthew A.; Marrone, Daniel P.; Narayanan, Desika; Phadke, Kedar A.; Reuter, Cassie; Rotermund, Kaja M.
In: Astrophysical Journal, Vol. 921, No. 1, 97, 11.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Molecular Line Observations in Two Dusty Star-forming Galaxies at z =6.9
AU - Jarugula, Sreevani
AU - Vieira, Joaquin D.
AU - Weiss, Axel
AU - Spilker, Justin S.
AU - Aravena, Manuel
AU - Archipley, Melanie
AU - Bethermin, Matthieu
AU - C. Chapman, Scott
AU - Dong, Chenxing
AU - Greve, Thomas R.
AU - Harrington, Kevin
AU - Hayward, Christopher C.
AU - Hezaveh, Yashar
AU - Hill, Ryley
AU - Litke, Katrina C.
AU - Malkan, Matthew A.
AU - Marrone, Daniel P.
AU - Narayanan, Desika
AU - Phadke, Kedar A.
AU - Reuter, Cassie
AU - Rotermund, Kaja M.
PY - 2021/11
Y1 - 2021/11
N2 - 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), [C i](2-1), and p-H2O(2(1,1) -2(0,2)) lines and dust continuum emissions with the Atacama Large Millimeter/submillimeter Array. The system consists of a pair of intensely star-forming, gravitationally lensed galaxies (labeled West and East). The intrinsic far-infrared luminosity is (16 +/- 4) x 10(12) L (circle dot) in West and (27 +/- 4) x 10(11) L (circle dot) in East. We model the dust, CO, and [C i] using non-local thermodynamic equilibrium radiative transfer models and estimate the intrinsic gas mass to be (5.4 +/- 3.4) x 10(11) M (circle dot) in West and (3.1 +/- 2.7) x 10(10) M (circle dot) in East. We find that the CO spectral line energy distribution in West and East are typical of high-redshift submillimeter galaxies (SMGs). The CO-to-H-2 conversion factor (alpha (CO)) and the gas depletion timescales 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.
AB - 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), [C i](2-1), and p-H2O(2(1,1) -2(0,2)) lines and dust continuum emissions with the Atacama Large Millimeter/submillimeter Array. The system consists of a pair of intensely star-forming, gravitationally lensed galaxies (labeled West and East). The intrinsic far-infrared luminosity is (16 +/- 4) x 10(12) L (circle dot) in West and (27 +/- 4) x 10(11) L (circle dot) in East. We model the dust, CO, and [C i] using non-local thermodynamic equilibrium radiative transfer models and estimate the intrinsic gas mass to be (5.4 +/- 3.4) x 10(11) M (circle dot) in West and (3.1 +/- 2.7) x 10(10) M (circle dot) in East. We find that the CO spectral line energy distribution in West and East are typical of high-redshift submillimeter galaxies (SMGs). The CO-to-H-2 conversion factor (alpha (CO)) and the gas depletion timescales 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.
KW - LENSED SUBMILLIMETER GALAXIES
KW - QUASAR HOST GALAXY
KW - INTERSTELLAR-MEDIUM
KW - ATOMIC CARBON
KW - PHYSICAL CONDITIONS
KW - STARBURST GALAXY
KW - REDSHIFT DISTRIBUTION
KW - CONTINUUM EMISSION
KW - ALMA OBSERVATIONS
KW - THERMAL BALANCE
U2 - 10.3847/1538-4357/ac21db
DO - 10.3847/1538-4357/ac21db
M3 - Journal article
VL - 921
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 97
ER -
ID: 299502211