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

Dye, S., Furlanetto, C., Dunne, Loretta ORCID:, Eales, Stephen ORCID:, Negrello, Mattia ORCID:, Nayyeri, H., van der Werf, P.P., Serjeant, S., Farrah, D., Michalowski, M.J., Baes, M., Marchetti, L., Cooray, A., Riechers, D.A. and Amvrosiadis, A. 2018. Modelling high resolution ALMA observations of strongly lensed highly star forming galaxies detected by Herschel. Monthly Notices of the Royal Astronomical Society 476 (4) , pp. 4383-4394. 10.1093/mnras/sty513

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We have modelled high resolution ALMA imaging of six strong gravitationally lensed galaxies detected by the Herschel Space Observatory. Our modelling recovers mass properties of the lensing galaxies and, by determining magnification factors, intrinsic properties of the lensed sub-millimetre sources. We find that the lensed galaxies all have high ratios of star formation rate to dust mass, consistent with or higher than the mean ratio for high redshift sub-millimetre galaxies and low redshift ultra-luminous infra-red galaxies. Source reconstruction reveals that most galaxies exhibit disturbed morphologies. Both the cleaned image plane data and the directly observed interferometric visibilities have been modelled, enabling comparison of both approaches. In the majority of cases, the recovered lens models are consistent between methods, all six having mass density profiles that are close to isothermal. However, one system with poor signal to noise shows mildly significant differences.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 23 February 2018
Date of Acceptance: 22 February 2018
Last Modified: 07 Nov 2023 22:51

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