Counter-Orbiting Tidal Debris as the Origin of the MW DoS

Details Counter-Orbiting Tidal Debris as the Origin of the MW DoS Counter-Orbiting Tidal Debris as the Origin of the MW DoS

2011-10-13

arxiv.org/abs/1110.3043v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

2 pages, 1 figure, to appear in the proceedings of the conference "Assembling the Puzzle of the Milky Way", Le Grand Bornand (

Scientific paper

The Milky Way satellite galaxies show a phase-space distribution that is not expected from the standard scenario of galaxy formation. This is a strong hint at them being of tidal origin, which would naturally explain their spacial distribution in a disc of satellites. It is shown that also their orbital directions can be reproduced with the debris of galaxy collisions. Both co- and counter-orbiting satellites are formed naturally in merger and fly-by interactions.

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