Gravitational lens candidates in the E-CDFS

Abstract

We report ten lens candidates in the E-CDFS from the GEMS survey. Nine of the systems are new detections and only one of the candidates is a known lens system. For the most promising five systems including the known lens system, we present results from preliminary lens mass modelling, which tests if the candidates are plausible lens systems. Photometric redshifts of the candidate lens galaxies are obtained from the COMBO-17 galaxy catalog. Stellar masses of the candidate lens galaxies within the Einstein radius are obtained by using the $z$-band luminosity and the $V-z$ color-based stellar mass-to-light ratios. As expected, the lensing masses are found to be larger than the stellar masses of the candidate lens galaxies. These candidates have similar dark matter fractions as compared to lenses in SLACS and COSMOS. They also roughly follow the halo mass-stellar mass relation predicted by the subhalo abundance matching technique. One of the candidate lens galaxies qualifies as a LIRG and may not be a true lens because the arc-like feature in the system is likely to be an active region of star formation in the candidate lens galaxy. Amongst the five best candidates, one is a confirmed lens system, one is a likely lens system, two are less likely to be lenses and the status of one of the candidates is ambiguous. Spectroscopic follow-up of these systems is still required to confirm lensing and/or for more accurate determination of the lens masses and mass density profiles.

12 pages, 5 figures, 3 tables, ApJ accepted

References in corpus (11)

• The Sloan Lens ACS Survey. V. The Full ACS Strong-Lens Sample
• The stellar masses of 25000 galaxies at 0.2<z<1.0 estimated by the COMBO-17 survey
• The Sloan Lens ACS Survey. VI: Discovery and analysis of a double Einstein ring
• The relation between star formation, morphology and local density in high redshift clusters and groups
• First catalog of strong lens candidates in the COSMOS field
• The VLA Survey of the Chandra Deep Field South: I. Overview of the Radio Data
• The Sloan Digital Sky Survey Quasar Lens Search. III. Constraints on Dark Energy from the Third Data Release Quasar Lens Catalog
• Extinction Curves of Lensing Galaxies out to z=1
• A New Estimate of the Hubble Time with Improved Modeling of Gravitational Lenses
• A Strong-Lens Survey in AEGIS: the influence of large scale structure
• Probing a massive radio galaxy with gravitational lensing