Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109..738c&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.109, p.738
Astronomy and Astrophysics
Astronomy
Scientific paper
The kinematic, chemical, and ionization conditions and spatial distributions of low ionization gas associated with early epoch ($0.3 \leq z \leq 1.7$) galaxies have been studied using high resolution (6.6~{\kms}) absorption line spectra. The absorption profiles for a total of 48 {\MgII} selected systems were obtained from 25 quasar (QSO) spectra observed with the HIRES spectrograph on the Keck~I telescope. In addition to the {\MgIIwaves} doublet, the {\MgI}~$\lambda 2853$ transition and multiple transitions of {\FeII} were also studied. In some cases, {\MnII} and {\CaII} were observed. The absorption profiles were objectively searched for weak absorbing ``subsystems'' in line--of--sight velocity space. For each overall system, and their multiple subsystems, absorption properties were measured directly from the flux values in the spectra. Additionally, the absorption profiles were modeled by Voigt Profile (VP) decomposition using an algorithm written for this work. Extensive simulations of the VP decomposition were performed in order to establish confidence levels on inferences based upon VP profile fits. (SECTION: Dissertation Summaries)
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