Mass models and environment of the new quadruply lensed quasar SDSS J1330+1810

Details Mass models and environment of the new quadruply lensed quasar SDSS J1330+1810 Mass models and environment of the new quadruply lensed quasar SDSS J1330+1810

2008-09-04

arxiv.org/abs/0809.0913v2

Mon.Not.Roy.Astron.Soc.391:1973-1980,2008

Astronomy and Astrophysics

Astrophysics

9 pages, 10 figures, 2 tables, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.14032.x

We present the discovery of a new quadruply lensed quasar. The lens system, SDSS J1330+1810 at z_s=1.393, was identified as a lens candidate from the spectroscopic sample of the Sloan Digital Sky Survey. Optical and near-infrared images clearly show four quasar images with a maximum image separation of 1.76", as well as a bright lensing galaxy. We measure a redshift of the lensing galaxy of z_l=0.373 from absorption features in the spectrum. We find a foreground group of galaxies at z=0.31 centred ~120" southwest of the lens system. Simple mass models fit the data quite well, including the flux ratios between images, although the lens galaxy appears to be ~1 mag brighter than expected by the Faber-Jackson relation. Our mass modelling suggests that shear from nearby structure is affecting the lens potential.

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