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Paper: Understanding the Stellar Populations of Lensed Galaxies at z∼2
Volume: 446, Galaxy Evolution: Infrared to Millimeter Wavelength Perspective
Page: 255
Authors: Wuyts, E.; Gladders, M. D.; Rigby, J. R.
Abstract: We present three bright, lensed galaxies recently discovered through visual inspection of the cluster catalogs of the Red Sequence Cluster Survey (RCS) and the Sloan Digital Sky Survey (SDSS). RCSGA 032727-132609 at z=1.7 is the brightest distant lensed galaxy in the Universe known to date; the giant arc extends over ∼ 38″ on the sky. SGAS J152745.1+065219 (z=2.76) and SGAS J122651.3+215220 (z=2.92) are both of comparable brightness to the prototypical lensed galaxy MS1512-cB58. Stellar population modeling of their rest-frame UV-to-near-IR spectral energy distributions highlights the similarity of these sources as relatively young (∼ 100 Myr), with little dust content (E(B–V)=0.10-0.15) and stellar masses ranging from 3×109 to 1010 M. Analysis of rest-frame optical spectra constrains the metallicity of their stellar populations. The availability of multiple strong-line metallicity indicators for RCSGA 032727-132609 allows one of the first tests of these locally calibrated diagnostics in situ at z∼2. From a total sample of five lensed galaxies, we see a significant intrinsic spread in the mass-metallicity relation of individual star-forming galaxies at these redshifts.
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