DISCOVERY OF A STRONG LENSING GALAXY EMBEDDED IN A CLUSTER AT z=1.62 Academic Article uri icon

abstract

  • 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 E 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 Ly and [O III] are likely to probe different regions in the source. 2014. The American Astronomical Society. All rights reserved..

published proceedings

  • ASTROPHYSICAL JOURNAL LETTERS

altmetric score

  • 93.974

author list (cited authors)

  • Wong, K. C., Tran, K., Suyu, S. H., Momcheva, I. G., Brammer, G. B., Brodwin, M., ... Rudnick, G. H.

citation count

  • 14

complete list of authors

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

publication date

  • July 2014