A strong-lensing elliptical galaxy in the MaNGA survey

TL;DR

This paper reports the discovery of a galaxy-scale gravitational lens in the MaNGA survey, demonstrating the potential of integral-field spectroscopy for identifying such systems and analyzing their mass distribution.

Contribution

First identification of a strong-lensing elliptical galaxy using MaNGA data, showcasing the effectiveness of systematic searches in integral-field spectroscopic surveys.

Findings

Lensing galaxy is a giant elliptical at z=0.122 with velocity dispersion 256 km/s.

Lensed source is at redshift 0.791, forming a ring with Einstein radius ~2.3 arcsec.

Total lensing mass is approximately 3.6 x 10^11 solar masses.

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 $\sigma=256$ km/s, at a redshift of $z_l=0.122$. After modelling and subtracting the target galaxy light, the integral-field data-cube reveals [OII], [OIII] and H$\beta$ emission lines corresponding to a source at $z_s=0.791$, forming an identifiable ring around the galaxy center. The Einstein radius is $R_{Ein} \approx 2.3$ arcsec, projecting to ~5 kpc at the distance of the lens. The total projected lensing mass is $(3.6\pm0.6) \times 10^{11} M_\odot$, and the total J-band mass-to-light ratio is $3.0\pm0.7$ 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.