Understanding the Stellar Populations of Lensed Galaxies at z˜2

Details Understanding the Stellar Populations of Lensed Galaxies at z˜2 Understanding the Stellar Populations of Lensed Galaxies at z˜2

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..446..255w&link_type=abstract

Galaxy evolution: Infrared to millimeter wavelength perspective. Proceedings of a conference held at Guilin, China 25-29 October

Astronomy and Astrophysics

Astronomy

Scientific paper

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&sun;. 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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