Proceedings of Symposium 3 of JENAM 2010 "Dwarf Galaxies: Key to Galaxy Formation and Evolution", Polychronis Papaderos, Simone Recchi, Gerhard Hensler (Eds.), Springer Publisher, Heidelberg
astro-ph/1205.1243

For a PDF version of the article, click here.

MORPHOLOGICAL MUTATIONS OF DWARF GALAXIES

Gerhard Hensler


University of Vienna, Institute of Astronomy, Austria

Abstract: Dwarf galaxies (DGs) are extremely challenging objects in extragalactic astrophysics. They are expected to originate as the first units in Cold Dark-Matter cosmology. They are the galaxy type most sensitive to environmental influences and their division into multiple types with various properties have invoked the picture of their variant morphological transformations. Detailed observations reveal characteristics which allow to deduce the evolutionary paths and to witness how the environment has affected the evolution. Here we review peculiarities of general morphological DG types and refer to processes which can deplete gas-rich irregular DGs leading to dwarf ellipticals, while gas replenishment implies an evolutionary cycling. Finally, as the less understood DG types the Milky Way satellite dwarf spheroidal galaxies are discussed in the context of transformation.


Table of Contents

INTRODUCTION

DWARF IRREGULAR GALAXIES AND THEIR EXTREME EVOLUTIONARY STAGES

DWARF ELLIPTICAL GALAXIES

MORPHOLOGICAL TRANSITIONS

DWARF SPHEROIDAL GALAXIES

REFERENCES

Next