Universal properties of violently relaxed gravitational structures (Articolo in rivista)

Type
Label
  • Universal properties of violently relaxed gravitational structures (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1093/mnras/sts365 (literal)
Alternative label
  • Francesco Sylos Labini (1,2) (2013)
    Universal properties of violently relaxed gravitational structures
    in Monthly notices of the Royal Astronomical Society (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Francesco Sylos Labini (1,2) (literal)
Pagina inizio
  • 679 (literal)
Pagina fine
  • 687 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://mnras.oxfordjournals.org/content/429/1/679.full (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 429 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 1 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Centro Studi e Ricerche Enrico Fermi, Via Panisperna, I-00184 Rome, Italy (2) Istituto dei sistemi complessi, Consiglio Nazionale delle Ricerche, Via dei Taurini 19, I-00185 Rome, Italy (literal)
Titolo
  • Universal properties of violently relaxed gravitational structures (literal)
Abstract
  • We study the collapse and virialization of an isolated spherical cloud of self-gravitating particles initially at rest and characterized by a power-law density profile, with exponent 0 ? a <3, or by a Plummer, a Hernquist, a Navarro Frenk and White, a Gaussian profile. We find that in all cases the virialized structure formed after the collapse has a density profile decaying, at large enough radii, as ~r-4, and a radial velocity dispersion profile decaying as ~r-1. We show that these profiles originate from the physical mechanism responsible for the ejection of a fraction of cloud's mass and energy during the collapse and that this same mechanism washes out the dependence on the initial conditions.When a large enough initial velocity dispersion is given to the cloud particles, ejection does not occur anymore and consequently the virialized halo density and velocity profiles display features which reflect the initial conditions. (literal)
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