A further study of the method of identifying absorption line systems in QSO spectra
TL;DR: In this paper, Chen et al. further developed the method of identifying absorption line systems in QSO spectra and applied it to PKS 0528-250, and gave two new absorption line system Za = 0.065 and 0.0345, consistent with the systems A1A2, B, C of Norton et al., but the systems D1, D2, E, F and G of Chen and Norton (1984).
About: This article is published in Chinese Astronomy and Astrophysics.The article was published on 1987-12-01. It has received 1 citations till now. The article focuses on the topics: Absorption spectroscopy & Spectral line.
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TL;DR: In this article, the authors search for heavy element absorption systems in the spectrum of QSO 2000-330, and they find six such systems, z α = 3.1913, 3.3334, 1.4419, 1,3441 and 3.3459.
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TL;DR: The analysis of the spectrum of PKS 2126-158 is used to develop criteria for defining particular types of redshift systems which can then form a basis for statistical analyses of the distribution of absorption systems with redshift in QSOs.
Abstract: Observations of the QSO PKS 2126--158 (Z/sub em/=3.280) at 0.8 A resolution from 4l53 A to 6807 A reveal 113 absorption lines. There are two certain absorption-line systems at z/sub abs/=2.6381 and 2.7685, and a possible third system at z/sub abs/=2.3938. The ions H I, C II, C IV, O I, Al II, Si II, Si III, Si IV, and Fe II are observed in these systems; no excited fine-structure lines Si II* are seen, but C II* is almost certainly present in the z/sub abs/=2.7685 system. These three systems lead to the identification of all 12 lines longward of the L..cap alpha.. emission line. However, only 22 out of 101 absorption lines shortward of L..cap alpha.. are thereby identified.Among the otherwise unidentiied lines shortward of L..cap alpha.. emission we find at most three clear L..cap alpha../..beta.. pairs. A cross-correlation between the regions of spectrum below L..cap alpha.. and L..beta.. emission, respectively, shows a strong peak at the L..cap alpha../..beta.. ratio. The peak has the strength expected on the hypothesis that > or approx. =90% of the lines shortward of L..cap alpha.. emission are L..cap alpha.. absorptions with the corresponding L..beta.. absorption buried in the noise.The analysis of the spectrummore » of PKS 2126--158 is used to develop criteria for defining particular types of redshift systems which can then form a basis for statistical analyses of the distribution of absorption systems with redshift in QSOs generally.« less
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