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Hα Kinematics of Tidal Tails in Interacting Systems: Projection Effects and Dark Matter in TDGs

Published online by Cambridge University Press:  26 May 2016

Philippe Amram ,
Fréderic Bournaud  and
Pierre-Alain Duc
Philippe Amram
Affiliation:
Observatoire de Marseille, France
Fréderic Bournaud
Affiliation:
CEA, Saclay, France Observatoire de Paris, France
Pierre-Alain Duc
Affiliation:
CEA, Saclay, France

Abstract

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Several interacting systems exhibit at the tip of their long tidal tails massive condensations of atomic hydrogen, which may be the progenitors of Tidal Dwarf Galaxies. Because, quite often, these tails are observed edge-on, projection effects have been claimed to account for the large HI column densities measured there. Here we show that determining the velocity field all along the tidal features, one may disentangle projection effects along the line of view from real bound structures. Due to its large field of view, high spectral and 2D spatial resolutions, Fabry-Perot observations of the ionized gas are well adapted to detect a kinematical signature of either streaming motions along a bent tidal tail or of in-falling/rotating material associated with a forming TDG. Spectroscopic observations also allow to measure the dynamical masses of the TDGs that are already relaxed and check their dark matter content.

Type
Part 4. Recycling
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 526 - 531
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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