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arxiv: 1309.2826 · v1 · submitted 2013-09-11 · 🌌 astro-ph.CO

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Discovery of a Quadruple Lens in CANDELS with a Record Lens Redshift z=1.53

A. van der Wel , G. van de Ven , M. Maseda , H.W. Rix , G.H. Rudnick , A. Grazian , S.L. Finkelstein , D.C. Koo
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S.M. Faber H.C. Ferguson A.M. Koekemoer N.A. Grogin D.D. Kocevski
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classification 🌌 astro-ph.CO
keywords lensredshiftgalaxymsolsourcestrongtelescopevery
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Using spectroscopy from the Large Binocular Telescope and imaging from the Hubble Space Telescope we discovered the first strong galaxy lens at z(lens)>1. The lens has a secure photometric redshift of z=1.53+/-0.09 and the source is spectroscopically confirmed at z=3.417. The Einstein radius (0.35"; 3.0 kpc) encloses 7.6 x 10^10 Msol, with an upper limit on the dark matter fraction of 60%. The highly magnified (40x) source galaxy has a very small stellar mass (~10^8 Msol) and shows an extremely strong [OIII]_5007A emission line (EW_0 ~ 1000A) bolstering the evidence that intense starbursts among very low-mass galaxies are common at high redshift.

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