Existence and Amount of Intergalactic Dust
The existence of intergalactic dust has been proved by the following observational facts : the decrease of the numbers of distant galaxies and clusters of galaxies behind the central regions of near clusters of galaxies; the different distributions of RR Lyrae stars and galaxies near i Microscopii (Hoffmeister’s cloud); the dependence of colour excesses of galaxies on supergalactic coordinates as well as on the surface density of bright galaxies; the colour index vs redshift correlation of quasistellar objects. The densities of intergalactic dust are estimated to be between 5 × 10−30 g cm−3 (near the centers of clusters of galaxies) and 2 × 10−34 g cm−3 (in general intergalactic space), The grains may be formed either in the early phases of the Universe (25 < z < 50) or may be expelled from galaxies by the radiation pressure. The most effective destruction process seems to be the evaporation by soft cosmic rays.
KeywordsColour Index Deceleration Parameter Colour Excess Dust Density Bright Galaxy
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