A high-redshift extension of the survey for C IV absorption in the spectra of QSOs - The redshift evolution of the heavy element absorbers

Details A high-redshift extension of the survey for C IV absorption in the spectra of QSOs - The redshift evolution of the heavy element absorbers A high-redshift extension of the survey for C IV absorption in the spectra of QSOs - The redshift evolution of the heavy element absorbers

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...72....1s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 72, Jan. 1990, p. 1-39.

Astronomy and Astrophysics

Astronomy

126

Absorption Spectra, Carbon, Galactic Evolution, Quasars, Red Shift, Sky Surveys (Astronomy), Astronomical Spectroscopy, Chemical Evolution, Heavy Elements, Lyman Alpha Radiation, Spectral Resolution, Ultraviolet Astronomy

Scientific paper

New spectroscopic observations of 11 very high redshift QSOs have been combined with previously published data on 55 QSOs to enhance the redshift coverage of a large survey for C IV absorption. The sample is used to discuss the evolution of the properties and distribution of the gas clouds giving rise to heavy element absorption in the QSO spectra. The number of C IV absorption systems per unit redshift range is found to decrease with increasing redshift in the range z(abs) = 1.3-3.7 in a manner which is inconsistent with a constant comoving density of absorbers. Thus, the properties of the absorbers are almost certainly evolving with time. The peak in the C IV two-point correlation function on velocity scales of 200-600 km/s appears to have the same power in high-redshift and low-redshift subsamples. The evolution of the number of observed C IV systems is interpreted as a systematic change in the mean C IV column density of the clouds.

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