Galaxy Evolution from QSO Absorption-Line Selected Samples
نویسندگان
چکیده
منابع مشابه
Field Galaxy Evolution since Z 1 from a Sample of Qso Absorption{selected Galaxies
We present some of the results of a large survey aimed at establishing the properties of galaxies selected by their having produced detectable Mg II 2796, 2803 absorption in the spectra of background QSOs. The present sample covers the redshift range 0:2 z 1:0, with hzi = 0:65. From an extensive program of optical and near-IR imaging and optical spectroscopy, we nd that the galaxies appear to b...
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A comprehensive set of all available magnitudes, colors and redshifts for optically identified QSO absorbers is compiled from the literature. This results in a largely unbiased sample of galaxies at high redshifts, the size of the sample being reasonably large to allow for a first comparison with galaxy evolution models. We use our evolutionary spectral synthesis models describing various spect...
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There exists a population of broad-line z∼2 QSOs which have heavily absorbed X-ray spectra. These objects constitute ∼10% of the population at luminosities and redshifts characteristic of the main producers of QSO luminosity in the Universe. Our follow up observations in the submm show that these QSOs are often embedded in ultraluminous starburst galaxies, unlike most unabsorbed QSOs at the sam...
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We review observations of molecular absorption line systems at high redshift toward red quasars and gravitational lenses. The steeply falling power law column density distribution function of QSO absorption line systems implies that for every 1000 Ly α forest lines from absorbers with hydrogen column density, NH < 10 15 cm there will be only one system with NH ≥ 10 cm (Hu et al. 1995). Although...
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Abundance histories for QSO absorption line systems as a function of redshift are presented for all metals lighter than gallium. Coupling various conventional cosmological models with a simple, rst{order model for the chemical evolution of the QSO absorption line systems allows transformation of the observed abundance trends in the Galaxy to abundance histories for the gas in QSO absorption lin...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1996
ISSN: 0074-1809
DOI: 10.1017/s0074180900232518