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Дата индексирования: Tue Oct 2 08:55:15 2012
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Поисковые слова: universe
Abstract
[*] Intermediate-Mass Black Holes in the Universe: Formation Theories
and Observational Constraints
van der Marel R.P.
in Carnegie Observatories Astrophysics Series,
Vol. 1: Coevolution of Black Holes and Galaxies, ed. L. C. Ho
(Cambridge: Cambridge Univ. Press), 37-52, 2004
This paper reviews the subject of intermediate-mass black holes
(IMBHs) with masses between those of "stellar-mass" and
"super-massive" black holes. The existence of IMBHs is a real
possibility: they might plausibly have formed as remnants of the first
generation of stars (Population III), as the result of dense star
cluster evolution, or as part of the formation process of
super-massive black holes. Their cosmic mass density could exceed that
of super-massive black holes (Omega = 10^{-5.7}) and observations do
not even rule out that they may account for all of the baryonic dark
matter in the Universe (Omega = 10^{-1.7}). Unambiguous detections of
individual IMBHs currently do not exist, but there are observational
hints from studies of microlensing events, "ultra-luminous" X-ray
sources, and centers of nearby galaxies and globular
clusters. Gravitational wave experiments will soon provide another
method to probe their existence. IMBHs have potential importance for
several fields of astrophysics and are likely to grow as a focus of
research attention.
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