First direct metallicity measurement of a lensed star-forming galaxy at z=1.7

Details First direct metallicity measurement of a lensed star-forming galaxy at z=1.7 First direct metallicity measurement of a lensed star-forming galaxy at z=1.7

2009-06-01

arxiv.org/abs/0906.0371v2

Astrophys.J.699:L161-L164,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

published version in ApJ Letters. 4 pages, 4 figure, 1 table. References updated

Scientific paper

10.1088/0004-637X/699/2/L161

We present the rest-frame optical spectrum of a strongly lensed galaxy at redshift z =1.7 behind the cluster Abell 1689. We detect the temperature sensitive auroral line [O III] 4363, which allows the first direct metallicity measurement for galaxies at z > 1. Our high signal-to-noise spectrum indicates that the target is an extremely low metallicity star-forming galaxy.We estimate an intrinsic absolute B band magnitude of M_{B}=-18.3 \pm 0.1$, with a stellar mass of 4.4$\pm1.2\times10^{8}$ M$_{\odot}$. This galaxy extends the luminosity-metallicity relation of star-forming galaxies at z > 2 by more than an order of magnitude. Given the double-nuclei like morphology and velocity profile of \ha, we tentatively suggest that it could be a merger or a proto-rotating disk galaxy.

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