Discovery of a strong lensing galaxy embedded in a cluster at z = 1.62

Kenneth C. Wong, Kim Vy H. Tran, Sherry H. Suyu, Ivelina G. Momcheva, Gabriel B. Brammer, Mark Brodwin, Anthony H. Gonzalez, Aleksi Halkola, Glenn G. Kacprzak, Anton M. Koekemoer, Casey J. Papovich, Gregory H. Rudnick

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15 Scopus citations


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 z S = 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.

Original languageEnglish
Article numberL31
JournalAstrophysical Journal Letters
Issue number2
StatePublished - 10 Jul 2014
Externally publishedYes


  • galaxies: clusters: individual (XMM-LSS J02182-05102)
  • galaxies: elliptical and lenticular, cD
  • galaxies: structure
  • gravitational lensing: strong


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