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Identifying old Tidal Dwarf Galaxies in Simulations and in the Nearby Universe

Published online by Cambridge University Press:  26 May 2016

Pierre-Alain Duc ,
Frédéric Bournaud  and
Frédéric Masset
Pierre-Alain Duc
Affiliation:
CNRS FRE 2591 and Service d'astrophysique, CEA-Saclay, France
Frédéric Bournaud
Affiliation:
CNRS FRE 2591 and Service d'astrophysique, CEA-Saclay, France LERMA, Observatoire de Paris, France
Frédéric Masset
Affiliation:
CNRS FRE 2591 and Service d'astrophysique, CEA-Saclay, France

Abstract

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Most Tidal Dwarf Galaxies (TDGs) so-far discussed in the literature may be considered as young ones or even newborns, as they are still physically linked to their parent galaxies by an umbilical cord: the tidal tail at the tip of which they are usually observed. Old Tidal Dwarf Galaxies, completely detached from their progenitors, are still to be found. Using N-body numerical simulations, we have shown that tidal objects as massive as 109 solar masses may be formed in interacting systems and survive for more than one Gyr. Old TDGs should hence exist in the Universe. They may be identified looking at a peculiarity of their “genetic identity card”: a relatively high abundance in heavy elements, inherited from their parent galaxies. Finally, using this technique, we revisit the dwarf galaxies in the local Universe trying to find arguments pro and con a tidal origin.

Type
Part 4. Recycling
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 550 - 555
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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