Cosmological self-similar shock waves and galaxy formation
1983; IOP Publishing; Volume: 268; Linguagem: Inglês
10.1086/160925
ISSN1538-4357
Autores Tópico(s)Galaxies: Formation, Evolution, Phenomena
Resumoview Abstract Citations (84) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Cosmological self-similar shock waves and galaxy formation Bertschinger, E. Abstract Similarity solutions are found which are valid for times long compared to the Hubble time for adiabatic shock waves in open and Einstein-de Sitter Friedmann universes. The fluid equations and boundary conditions are given and integrals of the motion are derived from similarity arguments. Initially the shock wave formed satisfied the Sedov solution for adiabatic evolution in a constant medium, but it is modified by the cosmological expansion to form a self-similar thin dense shell which cools by adiabatic expansion and is unstable to gravitational fragmentation and collapse. The shock solution is applied to the explosive amplification model of galaxy formation of Ostriker and Cowie (1981). One generation of explosive amplification from an initial seed galaxy produces a shell of about 300 billion solar masses in galaxies, with radius and velocity dispersion typical of small groups. Publication: The Astrophysical Journal Pub Date: May 1983 DOI: 10.1086/160925 Bibcode: 1983ApJ...268...17B Keywords: Big Bang Cosmology; Galactic Clusters; Galactic Evolution; Relativity; Shock Wave Interaction; Adiabatic Flow; Astronomical Models; Cooling; Gravitational Collapse; Intergalactic Media; Jeans Theory; Mass Distribution; Red Shift; Similarity Theorem; Astrophysics full text sources ADS |
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