Issue |
A&A
Volume 450, Number 1, April IV 2006
|
|
---|---|---|
Page(s) | 83 - 86 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20054531 | |
Published online | 03 April 2006 |
Galaxy peculiar motions under a diffusive-stochastic regime
Laboratório de Astrofísica Teórica e Observacional, Departamento de Ciências Exatas e Tecnológicas, Universidade Estadual de Santa Cruz – 45650-000, Ilhéus, Brazil e-mail: albr@uesc.br
Received:
16
November
2005
Accepted:
5
January
2006
Context.To investigate peculiar large scale motions under a diffusive-stochastic
fluid description.Aims.Our basic aims are to find the profile of the pairwise galaxy velocity
distribution using the dynamical fluid equation and to constrain the
profile with current observational data.Methods.We rewrite the fluid equation for the galaxy fluid using a coarse-grained
approach. Then, we solve the equation to find the theoretical
velocity probability
distribution. Next, we study the mode correlations in the Fourier space
and find the profile to be compared with current observational data.Results.The theoretical profile for the mode correlations is a Lorentzian,
which is in
good agreement with data. Also, our model allowed us
to constrain, for the first time,
the viscosity parameter of the cosmic fluid as ~3.35 . Conclusions.We find evidence that galaxy peculiar motions
can be described as a fluid under a
linear diffusive-stochastic regime at scales larger than ~
Mpc.
© ESO, 2006
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