FIRST DIRECT METALLICITY MEASUREMENT OF A LENSED STAR-FORMING GALAXY AT z=1.7

被引：45
|
作者：
Yuan, T. -T. [1 ]
Kewley, L. J. [1 ]
机构：
[1] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 699卷 / 02期
关键词：
galaxies: abundances; galaxies: evolution; galaxies: high-redshift; OXYGEN ABUNDANCE CALIBRATIONS; EMISSION-LINE SPECTRA; LYMAN-BREAK GALAXIES; DIGITAL SKY SURVEY; STELLAR POPULATION; MS; 1512-CB58; REDSHIFT; ULTRAVIOLET; CLASSIFICATION; SPECTROSCOPY;
D O I：
10.1088/0004-637X/699/2/L161
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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]lambda 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, with 12 + log(O/H) = 7.5(-0.2)(+0.1) from the direct T(e)-based method. We estimate an intrinsic absolute B-band magnitude of M(B) = -18.3 +/- 0.1, with a stellar mass of 4.4 +/- 1.2x10(8) M(circle dot). 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 the velocity profile of H alpha, we tentatively suggest that it could be a merger or a proto-rotating disk galaxy.
引用
收藏
页码：L161 / L164
页数：4
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