Statistics of Centroids of Velocity

Details Statistics of Centroids of Velocity Statistics of Centroids of Velocity

2009-01-13

arxiv.org/abs/0901.1899v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

To appear in proceedings of "Magnetic Fields in the Universe II"

Scientific paper

We review the use of velocity centroids statistics to recover information of interstellar turbulence from observations. Velocity centroids have been used for a long time now to retrieve information about the scaling properties of the turbulent velocity field in the interstellar medium. We show that, while they are useful to study subsonic turbulence, they do not trace the statistics of velocity in supersonic turbulence, because they are highly influenced by fluctuations of density. We show also that for sub-Alfv\'enic turbulence (both supersonic and subsonic) two-point statistics (e.g. correlation functions or power-spectra) are anisotropic. This anisotropy can be used to determine the direction of the mean magnetic field projected in the plane of the sky.

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