Tidal torques dynamical friction and the structure of clusters of galaxies

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dc.creatorDel Popolo, A.
dc.creatorGambera, M.
dc.date2001-05-22
dc.date.accessioned2026-07-07T01:58:39Z
dc.date.available2026-07-07T01:58:39Z
dc.descriptionWe study the joint effect of tidal torques and dynamical friction on the collapse of density peaks solving numerically the equations of motion of a shell of barionic matter falling into the central regions of a cluster of galaxies. We calculate the evolution of the expansion parameter, a(t), of the perturbation using a coefficient of dynamical friction eta_{cl} obtained from a clustered system and taking into account the gravitational interaction of the quadrupole moment of the system with the tidal field of the matter of the neighboring proto-galaxies. We show that within high-density environments, such as rich clusters of galaxies, tidal torques and dynamical friction slow down the collapse of low-nu peaks producing an observable variation of the parameter of expansion of the shell. As a consequence a bias of dynamical nature arises because high-density peaks preferentially collapse to form halos within which visible objects eventually will condense. For a standard Cold Dark Matter model this dynamical bias can account for a substantial part of the total bias required by observations on cluster scales.
dc.description19 pages; 8 encapsulated figures. 1999 IAUS 183, 245
dc.identifierhttps://arxiv.org/abs/astro-ph/0105388
dc.identifierhttp://arxiv.org/abs/astro-ph/0105388
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2801
dc.subjectAstrophysics
dc.titleTidal torques dynamical friction and the structure of clusters of galaxies
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