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Herschel-ATLAS: modelling the first strong gravitational lenses

Dye, S., Negrello, Mattia, Hopwood, R., Nightingale, J. W., Bussmann, R. S., Amber, S., Bourne, N., Cooray, A., Dariush, Aliakbar, Dunne, Loretta, Eales, Stephen Anthony, Gonzalez-Nuevo, J., Ibar, E., Ivison, R. J., Maddox, Steve, Valiante, Elisabetta and Smith, Matthew 2014. Herschel-ATLAS: modelling the first strong gravitational lenses. Monthly Notices of the Royal Astronomical Society 440 (3) , pp. 2013-2025. 10.1093/mnras/stu305

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Abstract

We have determined the mass density radial profiles of the first five strong gravitational lens systems discovered by the Herschel Astrophysical Terahertz Large Area Survey. We present an enhancement of the semilinear lens inversion method of Warren & Dye which allows simultaneous reconstruction of several different wavebands and apply this to dual-band imaging of the lenses acquired with the Hubble Space Telescope. The five systems analysed here have lens redshifts which span a range 0.22 ≤ z ≤ 0.94. Our findings are consistent with other studies by concluding that: (1) the logarithmic slope of the total mass density profile steepens with decreasing redshift; (2) the slope is positively correlated with the average total projected mass density of the lens contained within half the effective radius and negatively correlated with the effective radius; (3) the fraction of dark matter contained within half the effective radius increases with increasing effective radius and increases with redshift.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Oxford University Press
ISSN: 0035-8711
Date of Acceptance: 11 February 2014
Last Modified: 20 Feb 2019 13:04
URI: http://orca.cf.ac.uk/id/eprint/69474

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