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Improved mass constraints for two nearby strong-lensing elliptical galaxies from Hubble Space Telescope Imaging.

Collier, William P. and Smith, Russell J. and Lucey, John R. (2017) 'Improved mass constraints for two nearby strong-lensing elliptical galaxies from Hubble Space Telescope Imaging.', Monthly notices of the Royal Astronomical Society., 473 (1). pp. 1103-1107.


We analyse newly obtained Hubble Space Telescope (HST) imaging for two nearby strong lensing elliptical galaxies, SNL-1 (z = 0.03) and SNL-2 (z = 0.05), in order to improve the lensing mass constraints. The imaging reveals previously unseen structure in both the lens galaxies and lensed images. For SNL-1 which has a well resolved source, we break the mass-vs-shear degeneracy using the relative magnification information, and measure a lensing mass of 9.49 ± 0.15 × 1010 M⊙, a 7 per cent increase on the previous estimate. For SNL-2 the imaging reveals a bright unresolved component to the source and this presents additional complexity due to possible AGN microlensing or variability. We tentatively use the relative magnification information to constrain the contribution from SNL-2’s nearby companion galaxy, measuring a lensing mass of 12.59 ± 0.30 × 1010 M⊙, a 9 per cent increase in mass. Our improved lens modelling reduces the mass uncertainty from 5 and 10 per cent to 2 and 3 per cent respectively. Our results support the conclusions of the previous analysis, with newly measured mass excess parameters of 1.17 ± 0.09 and 0.96 ± 0.10 for SNL-1 and SNL-2, relative to a Milky-Way like (Kroupa) initial mass function.

Item Type:Article
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:01 September 2017
Date deposited:20 September 2017
Date of first online publication:07 September 2017
Date first made open access:No date available

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