Smith, Russell J. (2017) 'A strong-lensing elliptical galaxy in the MaNGA survey.', Monthly notices of the Royal Astronomical Society : letters., 464 (1). L46-L50.
Abstract
I report discovery of a new galaxy-scale gravitational lens system, identified using public data from the MaNGA survey, as part of a systematic search for lensed background line emitters. The lens is SDSS J170124.01+372258.0, a giant elliptical galaxy with velocity dispersion σ = 256 km s−1, at a redshift of zl = 0.122. After modelling and subtracting the target galaxy light, the integral-field data-cube reveals [O II], [O III] and Hβ emission lines corresponding to a source at zs = 0.791, forming an identifiable ring around the galaxy centre. If the ring is formed by a single lensed source, then the Einstein radius is REin ≈ 2.3 arcsec, projecting to ∼5 kpc at the distance of the lens. The total projected lensing mass is MEin = (3.6±0.6)× 1011 M⊙, and the total J-band mass-to-light ratio is 3.0±0.7 solar units. Plausible estimates of the likely dark matter content could reconcile this with a Milky-Way-like initial mass function (for which M/L ≈ 1.5 is expected), but heavier IMFs are by no means excluded with the present data. An alternative interpretation of the system, with a more complex source plane, is also discussed. The discovery of this system bodes well for future lens searches based on MaNGA and other integral-field spectroscopic surveys.
Item Type: | Article |
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Full text: | (VoR) Version of Record Download PDF (Advance online version) (232Kb) |
Full text: | (AM) Accepted Manuscript Download PDF (224Kb) |
Full text: | (VoR) Version of Record Download PDF (Final published version) (1195Kb) |
Status: | Peer-reviewed |
Publisher Web site: | https://doi.org/10.1093/mnrasl/slw174 |
Publisher statement: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2016 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Date accepted: | 31 August 2016 |
Date deposited: | 07 September 2016 |
Date of first online publication: | 02 September 2016 |
Date first made open access: | No date available |
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