CO, H2O, H2O+ line and dust emission in a z=3.63 strongly lensed starburst merger at sub-kiloparsec scales

C. Yang; R. Gavazzi; A. Beelen; P. Cox; A. Omont; M. D. Lehnert; Y. Gao; R. J. Ivison; A. M. Swinbank; L. Barcos-Munoz; R. Neri; A. Cooray; S. Dye; S. Eales; H. Fu; E. Gonzalez-Alfonso; E. Ibar; M. J. Michalowski; H. Nayyeri; M. Negrello; J. Nightingale; I. Perez-Fournon; D. A. Riechers; I. Smail; P. van der Werf

doi:10.1051/0004-6361/201833876

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CO, H2O, H2O+ line and dust emission in a z=3.63 strongly lensed starburst merger at sub-kiloparsec scales

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CO, H2O, H2O+ line and dust emission in a z=3.63 strongly lensed starburst merger at sub-kiloparsec scales

C. Yang, R. Gavazzi, A. Beelen, P. Cox, A. Omont, M. D. Lehnert, Y. Gao, R. J. Ivison, A. M. Swinbank, L. Barcos-Munoz, …

Astronomy and astrophysics (Berlin), Vol.624, A138

04/01/2019

DOI: 10.1051/0004-6361/201833876

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Abstract

Using the Atacama Large Millimeter/submillimeter Array (ALMA), we report high angular-resolution observations of the redshift z = 3.63 galaxy H-ATLAS J083051.0 + 013224 (G09v1.97), one of the most luminous strongly lensed galaxies discovered by the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS). We present 0 ''.2-0 ''.4 resolution images of the rest-frame 188 and 419 mu m dust continuum and the CO(6-5), H2O(2(11)-2(02)), and J(up) = 2H(2)O(+) line emission. We also report the detection of (H2O)-O-18(2(11)-2(02)) in this source. The dust continuum and molecular gas emission are resolved into a nearly complete similar to 1 ''.5 diameter Einstein ring plus a weaker image in the center, which is caused by a special dual deflector lensing configuration. The observed line profiles of the CO(6-5), H2O(2(11)-2(02)), and J(up) = 2H(2)O(+) lines are strikingly similar. In the source plane, we reconstruct the dust continuum images and the spectral cubes of the CO, H2O, and H2O+ line emission at sub-kiloparsec scales. The reconstructed dust emission in the source plane is dominated by a compact disk with an effective radius of 0.7 +/- 0.1 kpc plus an overlapping extended disk with a radius twice as large. While the average magnification for the dust continuum is mu similar to 10-11, the magnification of the line emission varies from 5 to 22 across different velocity components. The line emission of CO(6-5), H2O(2(11)-2(02)), and H2O+ have similar spatial and kinematic distributions. The molecular gas and dust content reveal that G09v1.97 is a gas-rich major merger in its pre-coalescence phase, with a total molecular gas mass of similar to 10(11) M-circle dot Both of the merging companions are intrinsically ultra-luminous infrared galaxies (ULIRGs) with infrared luminosities L-IR reaching greater than or similar to 4 x 10(12) L-circle dot, and the total L-IR of G09v1.97 is (1.4 +/- 0.7) x 10(13) L-circle dot. The approaching southern galaxy (dominating from V = -400 to -150 km s(-1) relative to the systemic velocity) shows no obvious kinematic structure with a semi-major half-light radius of a(s) = 0.4 kpc, while the receding galaxy (0 to 350 km s(-1)) resembles an a(s) = 1.2 kpc rotating disk. The two galaxies are separated by a projected distance of 1.3 kpc, bridged by weak line emission (150 to 0 km s(-1)) that is co-spatially located with the cold dust emission peak, suggesting a large amount of cold interstellar medium (ISM) in the interacting region. As one of the most luminous star-forming dusty high-redshift galaxies, G09v1.97 is an exceptional source for understanding the ISM in gas-rich starbursting major merging systems at high redshift.

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Title: Subtitle: CO, H2O, H2O+ line and dust emission in a z=3.63 strongly lensed starburst merger at sub-kiloparsec scales
Creators: C. Yang - European Southern Observatory
R. Gavazzi - Institut d'Astrophysique de Paris
A. Beelen - University of Paris-Sud
P. Cox - Institut d'Astrophysique de Paris
A. Omont - Institut d'Astrophysique de Paris
M. D. Lehnert - Institut d'Astrophysique de Paris
Y. Gao - Purple Mountain Observatory
R. J. Ivison - University of Edinburgh
A. M. Swinbank - Durham University
L. Barcos-Munoz - National Radio Astronomy Observatory
R. Neri - International Research Institute for Radio Astronomy
A. Cooray - University of California, Irvine
S. Dye - University of Nottingham
S. Eales - Cardiff University
H. Fu - University of Iowa
E. Gonzalez-Alfonso - Universidad de Alcalá
E. Ibar - University of Valparaíso
M. J. Michalowski - Adam Mickiewicz Univ, Fac Phys, Astron Observ Inst, Ul Sloneczna 36, PL-60286 Poznan, Poland
H. Nayyeri - University of California, Irvine
M. Negrello - Cardiff University
J. Nightingale - Durham University
I. Perez-Fournon - Universidad de La Laguna
D. A. Riechers - Cornell University
I. Smail - Durham University
P. van der Werf - Leiden University
Resource Type: Journal article
Publication Details: Astronomy and astrophysics (Berlin), Vol.624, A138
Publisher: Edp Sciences S A
DOI: 10.1051/0004-6361/201833876
ISSN: 0004-6361
eISSN: 1432-0746
Number of pages: 23
Grant note: 2017YFA0402700 / National Key R&D Program of China 2015/19/P/ST9/04010 / National Science Centre, Poland, through the POLONEZ grant ST/S00033X/1; ST/L004771/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) NAOC (China) 321302 / ERC; European Research Council (ERC); European Commission UK STFC Rutherford Fellowship scheme ASI (Italy); Agenzia Spaziale Italiana (ASI) ST/P000541/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) SinoFrench LIA-Origins joint exchange program 707601; 665778 / European Union; European Commission MCINN (Spain); Spanish Government NASA from JPL STFC, UKSA (UK); UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) SNSB (Sweden) CSA (Canada) 1171710 / FONDECYT; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); CONICYT FONDECYT AST-1614326 / NSF; National Science Foundation (NSF) ESO Fellowship CAS Key Research Program of Frontier Sciences CEA, CNES, CNRS (France); French Atomic Energy Commission; Centre National de la Recherche Scientifique (CNRS); Centre National D'etudes Spatiales ADAP NNX15AE56G / NASA; National Aeronautics & Space Administration (NASA) FIS2012-39162-C06-01; ESP2015-65597-C4-1-R / Spanish Ministerio de Economia y Competitividad; Spanish Government 11311130491; 11420101002 / NSFC; National Natural Science Foundation of China (NSFC) Programme National Cosmology and Galaxies AST-1614213 / National Science Foundation; National Science Foundation (NSF) NASA (USA); National Aeronautics & Space Administration (NASA)
Language: English
Date published: 04/01/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984428802902771

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