A search for disk-galaxy lenses in the Sloan Digital Sky Survey
Chlo\'e F\'eron, Jens Hjorth, John P. McKean, Johan Samsing

TL;DR
This study introduces an automated method to identify disk-galaxy gravitational lenses in SDSS data, confirming two systems and proposing several candidates for detailed mass and light distribution analysis.
Contribution
First automated spectroscopic search for disk-galaxy lenses in SDSS, with follow-up confirmation and candidate identification for gravitational lensing systems.
Findings
Confirmed two gravitational lens systems.
Identified four promising lens candidates.
Estimated mass-to-light ratios for confirmed lenses.
Abstract
We present the first automated spectroscopic search for disk-galaxy lenses, using the Sloan Digital Sky Survey database. We follow up eight gravitational lens candidates, selected among a sample of ~40000 candidate massive disk galaxies, using a combination of ground-based imaging and long-slit spectroscopy. We confirm two gravitational lens systems: one probable disk galaxy, and one probable S0 galaxy. The remaining systems are four promising disk-galaxy lens candidates, as well as two probable gravitational lenses whose lens galaxy might be an S0 galaxy. The redshifts of the lenses are z_lens ~ 0.1. The redshift range of the background sources is z_source ~ 0.3 - 0.7. The systems presented here are (confirmed or candidate) galaxy-galaxy lensing systems, that is, systems where the multiple images are faint and extended, allowing an accurate determination of the lens galaxy mass and…
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