MG II absorption in the spectra of 103 QSOs - Implications for the evolution of gas in high-redshift galaxies

Details MG II absorption in the spectra of 103 QSOs - Implications for the evolution of gas in high-redshift galaxies MG II absorption in the spectra of 103 QSOs - Implications for the evolution of gas in high-redshift galaxies

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...80....1s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 80, no. 1, May 1992, p. 1-108. Research supported by NASA.

Statistics

264

Absorption Spectra, Galactic Evolution, Interstellar Gas, Magnesium, Metallicity, Quasars, Astronomical Spectroscopy, Emission Spectra, Gravitational Lenses, Red Shift

Scientific paper

Spectra of 103 low- and intermediate-redshift QSOs with a resolution of 4-6 A were obtained in order to investigate the statistics of the M II 2796, 2803 absorption systems over the redshift range of 0.2-2.2. New emission-line redshifts, based mostly on Mg II 2800 and semiforbidden 1909, were determined for the QSOs. The mean number density of Mg II absorbers per unit redshift range decreased from 0.97 +/-0.10 for a rest equivalent width threshold of 0.3 A to 0.27 +/-0.05 for a threshold of 1.0 A. The results are in agreement with comparable previous work. The observed equivalent width distribution could be fitted with either exponential or power-law analytic distributions, with parameters in line with those found in earlier studies. Statistical tests show that the Mg II absorbers are uniformly distributed in both comoving coordinates and velocity relative to the QSO.

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