The formation and evolution of dwarf galaxies and Lyman-alpha clouds - Two-component dark matter universe. I

Details The formation and evolution of dwarf galaxies and Lyman-alpha clouds - Two-component dark matter universe. I The formation and evolution of dwarf galaxies and Lyman-alpha clouds - Two-component dark matter universe. I

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..485i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 485-496.

Astronomy and Astrophysics

Astrophysics

28

Dark Matter, Dwarf Galaxies, Galactic Evolution, Lyman Alpha Radiation, Molecular Clouds, Universe, Abundance, Elementary Particles, Galactic Clusters, Mass To Light Ratios, Star Formation

Scientific paper

The authors study galaxy formation in a universe dominated by two-component dark matter, composed of hot particles, like neutrinos, and hypothetical cold particles, like axions, that correspond to linearly independent initially adiabatic and isocurvature modes with a scale-free spectrum. The authors analyze the most natural case where they have comparable amplitudes at the epoch of equal matter and radiation energy density. The scenario for the formation of astronomical objects of various scales and their evolution based upon a two-component dark matter-dominated universe is presented. In the present paper, the authors study the formation and evolution of subgalactic objects formed prior to pancaking of the hot particles, associated Lyα absorbing clouds, and collapsing clouds, in which the cold dark matter dominates. The evolution of collapsed clouds, especially star formation bursts and resulting gas expulsion, is explored. The authors consider these systems to be dwarf galaxies, which can be detected as small velocity splitting metallic line absorption systems in quasar spectra.

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