MG II quasar absorption systems and properties of gaseous haloes

Details MG II quasar absorption systems and properties of gaseous haloes MG II quasar absorption systems and properties of gaseous haloes

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..309p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 309-326.

Astronomy and Astrophysics

Astrophysics

108

Absorption Spectra, Magnesium, Quasars, Cosmology, Halos, Iron, Line Spectra, Red Shift, Spectral Resolution

Scientific paper

Results are presented of observations on the variation in the cosmological evolution of the density of Mg II quasar absorption systems. Observations of Mg II and Fe II absorption were carried out in 10 quasars at high spectral resolution of either 0.37 or 0.65 A. It was found that the fraction of weak to strong Mg II systems is decreasing with increasing redshift, and that the evolution in redshift of the density of Mg II systems is a function of the equivalent width limit of the sample. For the width limit of about 0.3 A, the redshift distribution of Mg II systems is consistent with a nonevolving population. It was found that most of the Mg II subcomponents have a Mg II doublet of moderate opacity.

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