Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..583u&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 583-592.
Astronomy and Astrophysics
Astrophysics
18
Cosmology, Galactic Evolution, Missing Mass (Astrophysics), Neutrinos, Baryons, Density Distribution, Dwarf Galaxies, Fluctuation Theory, Lyman Alpha Radiation, Quasars
Scientific paper
The collisionless relics dominating the presently considered Einstein-de Sitter universe are neutrinos, as hot dark matter, and X-particles having negligible thermal velocity, as cold dark matter (CDM). On scales greater than that of neutrino collisionless damping, neutrino fluctuations develop with time, producing large scale, neutrino-overdense (NOD) and underdense (NUD) regions that subsequently evolve into superclusters and huge voids, respectively. Calculations are presented for the growth of fluctuations of CDM and induced fluctuations of baryons on subgalactic scales in both NOD and NUD regions, from the recombination epoch to the present. It is shown that dwarf galaxies are preferentially formed in NOD regions, and that subgalactic baryon fluctuations in NUD regions are subject to UV heating by QSOs before collapse.
Ikeuchi Satoru
Umemura Masayuki
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