Absorption lines at Z over 2.3 in spectra of quasi-stellar objects

Details Absorption lines at Z over 2.3 in spectra of quasi-stellar objects Absorption lines at Z over 2.3 in spectra of quasi-stellar objects

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..627k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 627-639. Research supported by the University of Chi

Astronomy and Astrophysics

Astrophysics

16

Absorption Spectra, Intergalactic Media, Interstellar Extinction, Line Spectra, Quasars, Red Shift, Carbon, Radial Velocity, Velocity Distribution

Scientific paper

A magnitude-limited sample of nine QSOs with redshifts z over about 3 was selected to look for intervening absorbers with z about 2.3-3.0. Thirty-five possible systems are found, 22 of which were not previously known. The main purpose was to search for a change in the number of the absorbers with redshift. A simple power law does not fit the data, owing to an excess of absorbers at z = 2 to 2.5. In an equivalent path length Delta z about 1.0 at z approximately 2.4, four intervening absorbers are found, whereas in Delta z about 1 at z about 3.2, no intervening absorbers are found. In addition, a slight lowering of ionization with z is found, and an increase in the relative number of weak C IV systems is found as z increases.

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