Lyman-alpha clouds as a relic of primordial density fluctuations

Details Lyman-alpha clouds as a relic of primordial density fluctuations Lyman-alpha clouds as a relic of primordial density fluctuations

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..627b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 627-638. NSERC-NASA-NSF-supported research.

Astronomy and Astrophysics

Astrophysics

126

Cosmology, Dark Matter, Intergalactic Media, Lyman Alpha Radiation, Relic Radiation, Dwarf Galaxies, Galactic Clusters, Galactic Evolution, Hydrodynamics, Photoionization

Scientific paper

Primordial density fluctuations are studied using a CDM model and primordial clouds some of which are expanding, driven by pressure gradients created when the medium is photionized, and some of which are massive enough to continue collapsing in spite of the pressure. Normalization of CDM models to the clustering properties on large scales are used to predict the parameters of collapsing clouds of subgalactic mass at early epochs. It is shown that the abundance and dimensions of these clouds are comparable to those of the Lyman-alpha systems. The evolutionary history of the clouds is computed, utilizing a spherically symmetric hydrodynamics code with the dark matter treated as a collisionless fluid, and the H I column density distribution is evaluated as a function of N(H I) and redshift. The observed cloud parameters come out naturally in the CDM model and suggest that Lyman-alpha clouds are the missing link between primordial density fluctuations and the formation of galaxies.

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