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Modelling high-resolution ALMA observations of strongly lensed dusty star-forming galaxies detected by Herschel

Maresca, Jacob, Dye, Simon, Amvrosiadis, Aristeidis, Bendo, George, Cooray, Asantha, De Zotti, Gianfranco, Dunne, Loretta ORCID:, Eales, Stephen, Furlanetto, Cristina, González-Nuevo, Joaquin, Greener, Michael, Ivison, Robert, Lapi, Andrea, Negrello, Mattia ORCID:, Riechers, Dominik, Serjeant, Stephen, Tergolina, Mônica and Wardlow, Julie 2022. Modelling high-resolution ALMA observations of strongly lensed dusty star-forming galaxies detected by Herschel. Monthly Notices of the Royal Astronomical Society 512 (2) , 2426–2438. 10.1093/mnras/stac585

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We present modelling of ∼0.1 arcsec resolution Atacama Large Millimetre/submillimetre Array imaging of seven strong gravitationally lensed galaxies detected by the Herschel Space Observatory. Four of these systems are galaxy–galaxy strong lenses, with the remaining three being group-scale lenses. Through careful modelling of visibilities, we infer the mass profiles of the lensing galaxies and by determining the magnification factors, we investigate the intrinsic properties and morphologies of the lensed submillimetre sources. We find that these submillimetre sources all have ratios of star formation rate to dust mass that are consistent with, or in excess of, the mean ratio for high-redshift submillimetre galaxies and low redshift ultra-luminous infrared galaxies. Reconstructions of the background sources reveal that the majority of our sample display disturbed morphologies. The majority of our lens models have mass density slopes close to isothermal, but some systems show significant differences.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Royal Astronomical Society
ISSN: 0035-8711
Date of First Compliant Deposit: 12 May 2022
Date of Acceptance: 28 February 2022
Last Modified: 23 May 2023 23:56

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