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Molecular gas and dust emission in a z = 3.63 strongly lensed starburst merger at sub-kiloparsec scales

Published online by Cambridge University Press:  04 June 2020

C. Yang Open the ORCID record for C. Yang [Opens in a new window] ,
R. Gavazzi ,
A. Beelen ,
P. Cox ,
A. Omont  and
M. D. Lehnert
C. Yang
Affiliation:
European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile email: [email protected]
R. Gavazzi
Affiliation:
Institut d’Astrophysique de Paris, Sorbonne Université, CNRS (UMR 7095), 98 bis bd Arago, 75014Paris, France
A. Beelen
Affiliation:
Institut d’Astrophysique Spatiale, CNRS (UMR 8617), Université Paris-Sud, Université Paris-Saclay, Orsay, France
P. Cox
Affiliation:
Institut d’Astrophysique de Paris, Sorbonne Université, CNRS (UMR 7095), 98 bis bd Arago, 75014Paris, France
A. Omont
Affiliation:
Institut d’Astrophysique de Paris, Sorbonne Université, CNRS (UMR 7095), 98 bis bd Arago, 75014Paris, France
M. D. Lehnert
Affiliation:
Institut d’Astrophysique de Paris, Sorbonne Université, CNRS (UMR 7095), 98 bis bd Arago, 75014Paris, France
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Abstract

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We present 0.″2–0.″4 resolution ALMA images of the submillimeter dust continuum and the CO, H2O, and H2O+ line emission in a z = 3.63 strongly lensed dusty starburst. We construct the lens model for the system with an MCMC technique. While the average magnification for the dust continuum is about 11, the magnification of the line emission varies from 5 to 22 across the source, resolving the source down to sub-kpc scales. The ISM content reveals that it is a pre-coalescence major merger of two ultra-luminous infrared galaxies, both with a large amount of molecular gas reservoir. The approaching galaxy in the south shows no apparent kinematic structure with a half-light radius of 0.4 kpc, while the preceding one resembles a 1.2 kpc rotating disk, separated by a projected distance of 1.3 kpc. The distribution of dust and gas emission suggests a large amount of cold ISM concentrated in the interacting region.

Keywords

galaxieshigh-redshiftISMgravitational lensingsubmillimetermolecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S352: Uncovering Early Galaxy Evolution in the ALMA and JWST Era , June 2019 , pp. 297 - 299
Copyright
© International Astronomical Union 2020

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