Study of z=3.5 Mg II Absorption Systems with Subaru IRCS Near-Infrared High-Resolution Spectroscopy

Astronomy and Astrophysics – Astronomy

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Scientific paper

Near-infrared (NIR, 1.03-1.35 μ m) high- and medium-resolution spectra of the quasi-stellar object (QSO) APM 08279+5255 were obtained with Subaru IRCS Echelle spectroscopy. We clearly detected Mg II λ λ 2796,2803 absorption lines at z_{abs}=3.5023, which is the first detection of ``weak Mg II system'' at high-redshift (z>3). We briefly discuss some preliminary results on the metalliciy and abundance of this system.

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