Formation of subgalactic objects within two-component dark matter (original) (raw)
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Abstract
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.
Publication:
The Astrophysical Journal
Pub Date:
December 1985
DOI:
Bibcode:
Keywords:
- Cosmology;
- Galactic Evolution;
- Missing Mass (Astrophysics);
- Neutrinos;
- Baryons;
- Density Distribution;
- Dwarf Galaxies;
- Fluctuation Theory;
- Lyman Alpha Radiation;
- Quasars;
- Astrophysics