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The Dynamics of the Substructures and the Bulk Flow of the Local Group

Published online by Cambridge University Press:  25 May 2016

V. G. Gurzadyan  and
S. Rauzy
V. G. Gurzadyan
Affiliation:
Department of Theoretical Physics, Yerevan Physics Institute, Yerevan 375036, Armenia.
S. Rauzy
Affiliation:
Centre de Physique Théorique - C.N.R.S., Luminy Case 907, F-13288 Marseille Cedex 9, France.

Abstract

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The S-tree method is used to reveal the substructures of the Local Group, namely the membership of each individual galaxy in the Milky Way and M31 subgroups; the method is determining the degree of mutual influence of the galaxies. Once the main physical subgroups of the Local Group are defined, we use a general method of reconstruction of their bulk flow using the radial velocity distribution of the member galaxies. The results particularly indicate the essential mutual bulk flow of the Milky Way and M31 subgroups which does not simply coincide with the radial approaching velocity (blueshift) of M31. Finally, having obtained the 3D velocity vectors of both the subgroups, we determine the 3D bulk flow of the Local Group itself, which in the Cosmic Microwave Background rest frame is equal to VLG→CMB = 668 kms−1 towards l = 265 and b = 42.

Type
Part 4. Morphology, Kinematics and Dynamics
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 427 - 432
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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