• DOI:10.1088/2041-8205/789/2/L31
• Corpus ID: 56376674

DISCOVERY OF A STRONG LENSING GALAXY EMBEDDED IN A CLUSTER AT z = 1.62

@article{Wong2014DISCOVERYOA,
  title={DISCOVERY OF A STRONG LENSING GALAXY EMBEDDED IN A CLUSTER AT z = 1.62},
  author={Kenneth C. Wong and K. V. Tran and Sherry H. Suyu and Ivelina G. Momcheva and Gabriel B. Brammer and Mark Brodwin and Anthony. H. Gonzalez and Aleksi Halkola and Glenn G. Kacprzak and Anton M. Koekemoer and Casey J. Papovich and Gregory H. Rudnick Institute of Astronomy and Astrophysics and Academia Sinica and Texas AM University and Yale University and Space Telescope Science Institute and University of Missouri-Kansas City and University of Central Florida and Swinburne University of Technology and University of Kansas},
  journal={The Astrophysical Journal Letters},
  year={2014},
  volume={789}
}

• Kenneth C. Wong, K. Tran, +18 authors U. Kansas
• Published 14 May 2014
• Physics
• The Astrophysical Journal Letters

We identify a strong lensing galaxy in the cluster IRC 0218 (also known as XMM-LSS J02182−05102) that is spectroscopically confirmed to be at z = 1.62, making it the highest-redshift strong lens galaxy known. The lens is one of the two brightest cluster galaxies and lenses a background source galaxy into an arc and a counterimage. With Hubble Space Telescope (HST) grism and Keck/LRIS spectroscopy, we measure the source redshift to be zS = 2.26. Using HST imaging in ACS/F475W, ACS/F814W, WFC3/F125W, and WFC3/F160W, we model the lens mass distribution with an elliptical power-law profile and account for the effects of the cluster halo and nearby galaxies. The Einstein radius is arcsec ( kpc) and the total enclosed mass is M. We estimate that the cluster environment contributes ∼10% of this total mass. Assuming a Chabrier initial mass function (IMF), the dark matter fraction within θE is , while a Salpeter IMF is marginally inconsistent with the enclosed mass (). The total magnification of the source is . The source has at least one bright compact region offset from the source center. Emission from Lyα and [O iii] are likely to probe different regions in the source.