We show that the observational data recently provided by Giovanelli et al. and discussed by Bahcall and Oh concerning the velocity distribution of clusters of galaxies can be naturally fitted by a statistical distribution which generalizes the Maxwell-Boltzmann one (herein recovered for the entropie index q = 1). Indeed a recent generalization of the Boltzmann-Gibbs thermostatistics suggests for this problem that the probability function is given, within a simple phenomenological model, by P(> v)=∫vvmaxdv[1-(1-q)(v/v0)2] (q)/(1-q)/∫0vmaxdv[1-(1-q)(v/v 0)2](q)/(1-q), (Equation Presented) A remarkably good fitting with the data is obtained for q=0.23-0.05+0.07 and v0=490±5 kms-1.
Non-extensive thermostatistical approach of the peculiar velocity function of galaxy clusters / LAVAGNO A.; KANIADAKIS G.; REGO-MONTEIRO M.; QUARATI P.; TSALLIS C.. - In: ASTROPHYSICAL LETTERS & COMMUNICATIONS. - ISSN 0888-6512. - 35:6(1998), pp. 449-455.
Titolo: | Non-extensive thermostatistical approach of the peculiar velocity function of galaxy clusters | |
Autori: | ||
Data di pubblicazione: | 1998 | |
Rivista: | ||
Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
http://hdl.handle.net/11583/1401969