The Large-Scale Structure and Environment of HoII

Details The Large-Scale Structure and Environment of HoII The Large-Scale Structure and Environment of HoII

2001-04-06

arxiv.org/abs/astro-ph/0104117v1

Astronomy and Astrophysics

Astrophysics

4 pages including 1 figure, LaTeX. Invited paper to appear in 'Dwarf Galaxies and their Environment", eds. K.S. de Boer, R.-J.

Scientific paper

Neutral hydrogen VLA D-array observations of the dwarf irregular galaxy HoII, a prototype galaxy for studies of shell formation and self-propagating star formation, are presented. The large-scale HI morphology is reminiscent of ram pressure and is unlikely caused by interactions. A case is made for intragroup gas in poor and compact groups similar to the M81 group, to which HoII belongs. Numerous shortcomings of the supernova explosions and stellar winds scenario to create the shells in HoII are highlighted, and it is suggested that ram pressure may be able to reconcile the numerous observations available.

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