| タイトル | Metal abundances and kinematics of a high-redshift galaxy obtained with the Kech telescope |
| 著者（英） | Tytler, David; Lanzetta, Kenneth M.; Wolfe, Arthur M.; Keane, Michael J.; Fan, Xiao-Ming; Vogt, Steven S. |
| 著者所属（英） | NASA Goddard Space Flight Center; NASA Headquarters |
| 発行日 | 1994-11-10 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | ASTRONOMY |
| レポートNO | 95A77035 |
| 権利 | Copyright |
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