Molecular QSO Absorption Line Systems
نویسندگان
چکیده
منابع مشابه
Molecular QSO Absorption Line Systems
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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A model of Lyman limit QSO absorption systems is investigated where they are produced in gaseous galactic halos with a two-phase structure: a hot phase at the halo virial temperature in approximate pressure equilibrium, and a cold, photoionized phase in the form of clouds confined by the pressure of the hot medium, and falling through it to the halo center, probably to accrete on a galactic dis...
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We have performed high-resolution hydrodynamic simulations of the Lya forest in a variety of popular cold dark matter dominated cosmologies, including a low density and a vacuumdominated model. The ̄uctuation amplitude of these models is chosen to match the observed abundance of galaxy clusters at low redshift. We assume that the intergalactic medium is photoionized and photoheated by a uniform...
متن کاملDependencies of QSO Lyα absorption line statistics on cosmological parameters
We have performed high-resolution hydrodynamic simulations of the Lyα forest in a variety of popular cold dark matter dominated cosmologies, including a low density and a vacuum-dominated model. The fluctuation amplitude of these models is chosen to match the observed abundance of galaxy clusters at low redshift. We assume that the intergalactic medium is photoionized and photoheated by a unifo...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 2002
ISSN: 1539-2996
DOI: 10.1017/s1539299600014131