The SDSS Discovery of a Strongly Lensed Post-Starburst Galaxy at z=0.766

Abstract

We present the first result of a survey for strong galaxy-galaxy lenses in Sloan Digital Sky Survey (SDSS) images. SDSS J082728.70+223256.4 was selected as a lensing candidate using selection criteria based on the color and positions of objects in the SDSS photometric catalog. Follow-up imaging and spectroscopy showed this object to be a lensing system. The lensing galaxy is an elliptical at z = 0.349 in a galaxy cluster. The lensed galaxy has the spectrum of a post-starburst galaxy at z = 0.766. The lensing galaxy has an estimated mass of $\sim 1.2\times 10^{12}{M}_{\odot }$ and the corresponding mass to light ratio in the B-band is $\sim 26M_{\odot }/L_{\odot }$ inside 1.1 effective radii of the lensing galaxy. Our study shows how catalogs drawn from multi-band surveys can be used to find strong galaxy-galaxy lenses having multiple lens images. Our strong lensing candidate selection based on photometry-only catalogs will be useful in future multi-band imaging surveys such as SNAP and LSST.

Accepted for publication in AJ

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• Mass models and environment of the new quadruply lensed quasar SDSS J1330+1810
• Discovery of four gravitational lensing systems by clusters in the SDSS DR6