A possible gravitational lens in the Hubble Deep Field South
Abstract
We model an apparent gravitational lens system HDFS 2232509-603243 in the Hubble Deep Field South. The system consists of a blue V=25 mag arc separated by 0.9 arcsec from a red V=22 mag elliptical galaxy. A mass distribution which follows the observed light distribution with a constant mass-to-light ratio can fit the arc component positions if external shear is added. A good fit is also obtained with simple parameterized models, and all the models predict a forth image fainter than the detection limit. The inferred mass-to-light ratio is roughly 15 in solar units if the lens is at redshift 0.6. The lens models predict a velocity dispersion of about 280 km/s which could be confirmed with spectroscopy.
Keywords
Cite
@article{arxiv.astro-ph/9812273,
title = {A possible gravitational lens in the Hubble Deep Field South},
author = {Rennan Barkana and Roger Blandford and David Hogg},
journal= {arXiv preprint arXiv:astro-ph/9812273},
year = {2009}
}
Comments
12 pages, 3 PostScript figures, accepted by ApJL. Revised to account for the referee's report, also some rewriting