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A strong-lensing elliptical galaxy in the MaNGA survey

Smith, Russell J.

A strong-lensing elliptical galaxy in the MaNGA survey Thumbnail


Authors



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.

Citation

Smith, R. J. (2017). A strong-lensing elliptical galaxy in the MaNGA survey. Monthly Notices of the Royal Astronomical Society: Letters, 464(1), L46-L50. https://doi.org/10.1093/mnrasl/slw174

Journal Article Type Article
Acceptance Date Aug 31, 2016
Online Publication Date Sep 2, 2016
Publication Date Jan 1, 2017
Deposit Date Sep 1, 2016
Publicly Available Date Sep 7, 2016
Journal Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 464
Issue 1
Pages L46-L50
DOI https://doi.org/10.1093/mnrasl/slw174
Related Public URLs https://arxiv.org/pdf/1608.01967v2

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Copyright Statement
Advance online version 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.





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