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Publications of The Korean Astronomical Society, 2(30), p. 389-392, 2015

DOI: 10.5303/pkas.2015.30.2.389

American Astronomical Society, Astrophysical Journal Letters, 2(789), p. L31, 2014

DOI: 10.1088/2041-8205/789/2/l31

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Discovery of a Strong Lensing Galaxy Embedded in a Cluster at z = 1.62

Journal article published in 2014 by Kenneth C. Wong, Kim-Vy H. Tran, Sherry H. Suyu, Ivelina G. Momcheva, Gabriel B. Brammer ORCID, Mark Brodwin ORCID, Anthony H. Gonzalez, Aleksi Halkola, Glenn G. Kacprzak, Anton M. Koekemoer ORCID, Casey J. Papovich ORCID, Gregory H. Rudnick ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 $z_{\rm S}=2.26$. 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 $\theta_{\rm E}=0.38^{+0.02}_{-0.01}$" ($3.2_{-0.1}^{+0.2}$ kpc) and the total enclosed mass is M$_{\rm tot} (