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Title:
Superclustering of damped Lyman-alpha absorption systems at redshifts above two
Authors:
Francis, Paul J.; Hewett, Paul C.
Affiliation:
AA(Steward Observatory, Tucson, AZ), AB(Cambridge Univ. Inst. of Astronomy, United Kingdom)
Publication:
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1633-1636. (AJ Homepage)
Publication Date:
05/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, LYMAN ALPHA RADIATION, MOLECULAR CLOUDS, QUASARS, RED SHIFT, DARK MATTER, LINE OF SIGHT
DOI:
10.1086/116542
Bibliographic Code:
1993AJ....105.1633F

Abstract

Two high redshift QSOs (z = 3.23 and z = 3.18) separated by 8 arcmin, and containing two strong Ly-alpha absorption systems each, were observed. In both cases, the velocities of the absorption systems between the lines of sight differ by only about 300 km/s. Low ionization metal lines are related to at least one of the absorption systems, and the neutral hydrogen column densities deduced from the profiles lie between 1.2 x 10 exp 18 and 1.2 x 10 exp 20/sq cm. The probability of observing both redshift coincidences is very low, about 0.0003. The probability of seeing the wavelength matches is increased if the absorbers are clustered. Giant gas clouds cover both lines of sight, they must have solar masses of more than 10 exp 11. These observations all hint at the presence of large dense structures in the early universe.

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