Ly-alpha clouds - Isolated structures in cold dark matter cosmogony?

Details Ly-alpha clouds - Isolated structures in cold dark matter cosmogony? Ly-alpha clouds - Isolated structures in cold dark matter cosmogony?

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...349..429b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 349, Feb. 1, 1990, p. 429-436.

Astronomy and Astrophysics

Astrophysics

7

Dark Matter, Lyman Alpha Radiation, Quasars, Space Density, Cosmology, Normal Density Functions

Scientific paper

A filter designed to study isolated density fluctuations is introduced and used to identify Ly-alpha cloud candidates in a biased CDM model. It is found that the number density of cloud candidates at z = 2.5 is too small to account for the observed number of lines. If Ly-alpha clouds have their origins in primordial density fluctuations, the CDM power spectrum does not have sufficient power on subgalactic scales to account for the observed structures.

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