NDLI: The formation of the first objects during the virialization of the dark-matter halos

Content Provider	Springer Nature Link
Author	Vasiliev, E. O. Shchekiv, Yu. A.
Copyright Year	2003
Abstract	The chemical and thermal evolution of the baryon component in the gravitational field of low-mass primordial dark-matter halos during their virialization is studied. We consider low-mass halos to be those for which the characteristic baryon cooling time can appreciably exceed the comoving Hubble time, so that the cooling process can continue to the current epoch (z∼0). The virialization process is described in two scenarios: “quiet” virialization, in which the establishment of the virial state is assumed to be homogeneous over the entire volume considered, and “violent” virialization, in which the establishment of the virial state is assumed to be realized via the action of shock waves. In this second case, the efficiency of the formation of molecular hydrogen grows substantially, and can reach H$_{2}$/H∼0.01 in some cases, which exceeds current estimates by at least an order of magnitude. This eases the condition for the birth of the first gravitationally bound objects with comparatively low masses (M ≳ 2 × 10$^{5}$ M $_{⊙}$), possibly leading to an appreciable increase in the fraction of the mass contained in Population III objects, and also to a shift in the onset of the formation of the first stars toward higher redshifts.
Starting Page	979
Ending Page	988
Page Count	10
File Format	PDF
ISSN	10637729
Journal	Astronomy Reports
Volume Number	47
Issue Number	12
e-ISSN	15626881
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2003-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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