Metal abundances and kinematics of a high-redshift galaxy obtained with the Kech telescope

Details Metal abundances and kinematics of a high-redshift galaxy obtained with the Kech telescope Metal abundances and kinematics of a high-redshift galaxy obtained with the Kech telescope

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435l.101w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 435, no. 2, p.L101-L104

Astronomy and Astrophysics

Astrophysics

73

Abundance, Disk Galaxies, Galactic Evolution, Kinematics, Metallicity, Quasars, Red Shift, Spiral Galaxies, Absorption Spectra, Echelle Gratings, Spectrometers, Telescopes

Scientific paper

We use the Kech 10 m telescope and its high-resolution echelle spectrometer (HIRES) to obtain accurate high-resolution spectra of a quasar to determine element abundances of a probable foreground young galaxy with redshift z = 2.309. Precise measurements of absorption lines lead to the first accurate abundance determinations on Zn, Cr, and Ni at large redshifts. We find that (Zn/H) = -1.55 +/- 0.11, while (Cr/H) = -1.79 +/- 0.10 and (Ni/H) = -2.13 +/- 0.08. The Zn abundance indicates low metallicity, while the Cr and Ni abundances are consistent with depletion of these elements onto grains. We also find (O/H) less than 0.97. Therefore, the galaxy is more metal-deficient than the oldest disk stars in the Galaxy. The kinematic evidence is consistent with a thick disk of gas with rotation speed and radius comparable to the rotation speeds and radii of current luminous spiral galaxies. Therefore, a rotationally supported disk may be in place at z greater than 2.

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