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Morphological aspects of star formation in dwarf galaxies

Published online by Cambridge University Press:  12 April 2016

Noah Brosch ,
Ana Heller  and
Elchanan Almoznino
Noah Brosch
Affiliation:
The Wise Observatory and the School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
Ana Heller
Affiliation:
The Wise Observatory and the School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
Elchanan Almoznino
Affiliation:
The Wise Observatory and the School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel

Abstract

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We studied the morphology of star formation in dwarf irregular galaxies and found that, in general, this takes place on one side of a galaxy and far from the center. This is mainly true for low surface brightness galaxies; in high surface brightness dwarf irregulars the star formation tends to be more centrally concentrated, as well as being more intense. We discuss possible star formation triggers in dwarf irregular galaxies, and evaluate the reasons for the peculiar distribution of star forming regions of these galaxies. Stochastic star formation, interactions with external gas, and tidal interactions appear to be ruled out as responsible for the asymmetric pattern of star formation. We conclude that asymmetry of a dark matter halo or of an asymmetric underlying stellar distribution may trigger an asymmetric pattern of star formation.

Keywords

: star formationdwarf galaxiesHII regionsmorphology
Type
The evolution of Low Surface Brightness galaxies
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 261 - 270
Copyright
Copyright © Astronomical Society of the Pacific 1999

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