A high-resolution study of the absorption spectrum of PKS 2126-158.
Abstract
A list of 113 absorption lines in the spectrum of the QSO PKS 2126-158 (emission redshift, z = 3.280) in the wavelength range from 4153 to 6807 A is presented. Heliocentric vacuum wavelengths and equivalent widths are provided. Two certain absorption redshift systems, at z = 2.6381 (14 lines) and z = 2.7685 (16 lines), are established, along with a possible system of four lines at z = 2.3938. Column densities are estimated for the ions in the redshift systems; it is found that the 1533-A excited fine-structure line of Si II (J = 3/2) is absent from all the absorption redshift systems but that the 1335-A excited fine-structure line of C II (J = 3/2) is almost certainly present in the z = 2.7685 system. The many unidentified lines shortward of L-alpha emission are examined, and no more than three L-alpha/beta pairs are shown to be visible in the spectrum. A cross-correlation analysis indicates that at least about 90% of the unidentified lines must be single L-alpha lines.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1979
- DOI:
- 10.1086/157024
- Bibcode:
- 1979ApJ...229..891Y
- Keywords:
-
- Absorption Spectra;
- High Resolution;
- Line Spectra;
- Quasars;
- Cross Correlation;
- Fine Structure;
- Lyman Alpha Radiation;
- Spectral Resolution;
- Astrophysics;
- Absorption Lines:Quasars;
- Line Identifications:Quasars