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2003MNRAS.340..525D - Mon. Not. R. Astron. Soc., 340, 525-542 (2003/April-1)
Statistical characteristics of the observed Ly-α forest and the shape of initial power spectrum.
DEMIANSKI M., DOROSHKEVICH A.G. and TURCHANINOV V.
Abstract (from CDS):
The simple physical model of absorbers asserts that they are composed of DM and gaseous matter. It allows us to estimate the column density and overdensity of DM and gaseous components and the entropy of the gas trapped within the DM potential wells. The parameters of the DM component are found to be consistent with theoretical expectations for the Gaussian initial perturbations with the warm dark matter-like power spectrum. The basic physical factors responsible for the evolution of the absorbers are discussed.
The analysis of redshift distribution of absorbers confirms the self-consistency of the adopted physical model, Gaussianity of the initial perturbations and allows one to estimate the shape of the initial power spectrum at small scales that, in turn, restricts the mass of the dominant fraction of DM particles to MDM≥ 1.5-5 keV. Our results indicate a possible redshift variations of intensity of the ultraviolet background by approximately a factor of 2-3 at redshifts z ∼ 2-3.
Abstract Copyright: 2003 RAS
Journal keyword(s): quasars: absorption lines - large-scale structure of the Universe
CDS comments: Table 1: QSO 1122-441 not identified.
Simbad objects: 16
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