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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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