dc.contributorUniversidade Federal de Campina Grande
dc.contributorUniversidade de S�o Paulo
dc.contributorUniversity of Catania
dc.contributorIstituto Nazionale di Fisica Nucleare Sezione di Catania
dc.contributorUniversidade Federal Do Rio Grande Do Norte
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorChinese Academy of Sciences
dc.date.accessioned2018-12-11T17:03:04Z
dc.date.available2018-12-11T17:03:04Z
dc.date.created2018-12-11T17:03:04Z
dc.date.issued2016-05-09
dc.identifierJournal of Cosmology and Astroparticle Physics, v. 2016, n. 5, 2016.
dc.identifier1475-7516
dc.identifierhttp://hdl.handle.net/11449/173002
dc.identifier10.1088/1475-7516/2016/05/021
dc.identifier2-s2.0-84970028606
dc.identifier2-s2.0-84970028606.pdf
dc.description.abstractThe motion of a point like object of mass M passing through the background potential of massive collisionless particles (m ≤ M) suffers a steady deceleration named dynamical friction. In his classical work, Chandrasekhar assumed a Maxwellian velocity distribution in the halo and neglected the self gravity of the wake induced by the gravitational focusing of the mass M. In this paper, by relaxing the validity of the Maxwellian distribution due to the presence of long range forces, we derive an analytical formula for the dynamical friction in the context of the q-nonextensive kinetic theory. In the extensive limiting case (q = 1), the classical Gaussian Chandrasekhar result is recovered. As an application, the dynamical friction timescale for Globular Clusters spiraling to the galactic center is explicitly obtained. Our results suggest that the problem concerning the large timescale as derived by numerical N-body simulations or semi-analytical models can be understood as a departure from the standard extensive Maxwellian regime as measured by the Tsallis nonextensive q-parameter.
dc.languageeng
dc.relationJournal of Cosmology and Astroparticle Physics
dc.relation1,089
dc.rightsAcesso aberto
dc.sourceScopus
dc.subjectdwarfs galaxies
dc.subjectgalaxy dynamics
dc.titleChandrasekhar's dynamical friction and non-extensive statistics
dc.typeArtículos de revistas


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