Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42l..11m&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 2, 1990, p. L11-L18.
Astronomy and Astrophysics
Astronomy
24
Absorption Spectra, Flux Density, Quasars, Stellar Spectra, Ultraviolet Radiation, Cosmology, Density Distribution, Lyman Spectra
Scientific paper
The observed distribution function of H I column densities in the absorption systems of quasars from N(HI) = 10 exp 13.5/sq cm (Lyman-alpha forest) through 10 exp 22/sq cm (damped Lyman-alpha systems) is well reproduced by considering the two-phase nature of intergalactic clouds confined by the gravity of cold dark matter, the so-called 'minihalos'. By the shielding effect of diffuse UV flux due to neutral hydrogen, the optically thick neutral core appears in a massive minihalo; this core is detected as high column density systems. The highly ionized outer envelope of a minihalo corresponds to a Lyman-alpha forest. If star formation occurs in the collapsing core and ionizes the surrounding gas, this should be detectable as metal-line systems. In this way, a unified picture of various absorption systems as minihalos with neutral cores emerges.
Ikeuchi Satoru
Murakami Izumi
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