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Absorption-Line Spectroscopy of Close Pairs of QSOs

Published online by Cambridge University Press:  04 August 2017

P. A. Shaver  and
J. G. Robertson
P. A. Shaver
Affiliation:
European Southern Observatory, Munich
J. G. Robertson
Affiliation:
Anglo-Australian Observatory, Sydney

Extract

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Close pairs of QSOs (separations ≲ 1–5 arcmin) provide a powerful approach to the study of narrow absorption lines in QSO spectra. By looking for absorption in the spectrum of the higher-redshift QSO at the redshift of the other (“associated absorption”), or absorption in both spectra at the same redshift (“common absorption”), one may address several issues: the cosmological nature of QSO redshifts, the origin of the narrow absorption lines of high redshift and excitation (intrinsic or intervening), the clustering of absorbing systems (with each other, and with QSOs), the sizes of the absorbing regions (for metal absorption lines and for Lyα lines; absorption cross-sections of individual galaxies and of clusters of galaxies), and the presence and nature of gaseous halos around QSOs.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 104: Early Evolution of the Universe and Its Present Structure , 1983 , pp. 369 - 370
Copyright
Copyright © Reidel 1983 

References

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