A strong-lensing elliptical galaxy in the MaNGA survey
  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.
