Invited talk at JENAM 2010 symposium on "Dwarf Galaxies"
astro-ph/1101.4834

For a PDF version of the article, click here.

BIRTH, LIFE AND SURVIVAL OF TIDAL DWARF GALAXIES

Pierre-Alain Duc


Laboratoire AIM Paris Saclay


Abstract: Advances on the formation and survival of the so-called Tidal Dwarf Galaxies (TDGs) are reviewed. The understanding on how objects of the mass of dwarf galaxies may form in debris of galactic collisions has recently benefited from the coupling of multi-wavelength observations with numerical simulations of galaxy mergers. Nonetheless, no consensual scenario has yet emerged and as a matter of fact the very definition of TDGs remains elusive. Their real cosmological importance is also a matter of debate, their presence in our Local Group of galaxies as well. Identifying old, evolved, TDGs among the population of regular dwarf galaxies and satellites may not be straightforward. However a number of specific properties (location, dark matter and metal content) that objects of tidal origin should have are reminded here. Examples of newly discovered genuine old TDGs around a nearby elliptical galaxy are finally presented.


Table of Contents

INTRODUCING TIDAL DWARF GALAXIES

BIRTH OF TIDAL DWARF GALAXIES: MODELS, SIMULATIONS

LIFE OF TIDAL DWARF GALAXIES: DYNAMICS

DEATH OF TIDAL DWARF GALAXIES: LIFE EXPECTANCY, CENSUS

REFERENCES

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