SIMBAD references

2009ApJ...699L.161Y - Astrophys. J., 699, L161-L164 (2009/July-2)

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

YUAN T.-T. and KEWLEY L.J.

Abstract (from CDS):

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] λ4363, 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+0.1–0.2 from the direct Te-based method. We estimate an intrinsic absolute B-band magnitude of MB= -18.3±0.1, with a stellar mass of 4.4±1.2x108 M. 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 Hα, we tentatively suggest that it could be a merger or a proto-rotating disk galaxy.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: high-redshift

Status at CDS:  

Simbad objects: 2

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2020.03.31-02:23:41

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