A high-resolution study of the absorption spectrum of PKS 2126-158

Details A high-resolution study of the absorption spectrum of PKS 2126-158 A high-resolution study of the absorption spectrum of PKS 2126-158

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..891y&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, May 1, 1979, p. 891-908. Research supported by the Science Research Council of England

Astronomy and Astrophysics

Astrophysics

112

Absorption Spectra, High Resolution, Line Spectra, Quasars, Cross Correlation, Fine Structure, Lyman Alpha Radiation, Spectral Resolution

Scientific paper

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.

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