The Early Universe Probed by QSO Absorption Lines

Details The Early Universe Probed by QSO Absorption Lines The Early Universe Probed by QSO Absorption Lines

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000asthe..93..712m&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 93, No. 12, p. 712 - 719 (2000)

Astronomy and Astrophysics

Astronomy

1

Scientific paper

High-z QSOs are valuable probes of the early universe and provide us information on the era of galaxy formation. QSOs can also be used as background sources against intervening objects such as proto-galactic clouds and faint foreground galaxies. These intervening objects produce absorption lines in the spectra of background QSOs. Gas clouds producing metal absorption lines are thought to exist in the halos of intervening galaxies and are used to evaluate the metal abundances of galaxies at high redshifts. In the course of studying the evolution of metal absorption lines, it was found that the number of absorbers per unit redshift interval increases in the vicinity of QSOs, especially of radio-loud QSOs. The reason of such an excess of metal absorption lines remains still unclear. In this paper, the authors review the absorption properties and enigmas of quasar absorption lines.

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