A Possible Mechanism to Form Low Mass Objects at Low Redshifts
Authors: Ribeiro, André; Letelier, Patricio
Source: Astrophysics and Space Science, Volume 298, Number 4, August 2005 , pp. 509-518(10)
Abstract:We develop a quantitative criterion for the collapse of matter within a region where a global texture just collapsed and a non-zero peculiar velocity field is produced. We also describe the evolution of the density contrast in this region according to the non-linear spherical collapse model. In particular, we find that the overdensity needed to virialisation is reached at z ≤ 2.2, covering a mass range of about 104–107 M⊙ in the context of an Einstein-de Sitter universe.
Document Type: Research Article
Affiliations: Departamento de Matemática Aplicada, (IMECC/UNICAMP), Laboratório de Astrofísica Teórica e Observacional, (DCET/UESC), Brazil,
Publication date: August 1, 2005