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What Causes the HI Holes in Gas-Rich LSB Dwarfs?

Published online by Cambridge University Press:  12 April 2016

Katherine L. Rhode ,
John J. Salzer  and
David J. Westpfahl
Katherine L. Rhode
Affiliation:
Astronomy Department, Yale University, New Haven, CT 06520
John J. Salzer
Affiliation:
Astronomy Department, Wesleyan University, Middletown, CT 06459
David J. Westpfahl
Affiliation:
Department of Physics, New Mexico Institute of Mining & Technology, Socorro, NM 87801

Abstract

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We have carried out a deep, multi-color imaging study of Holmberg II (Ho II) and several other nearby LSB dwarf galaxies for which detailed HI maps exist. The formation of the HI holes in these galaxies has been attributed to multiple supernovae (SNe) occurring within windblown shells around young, massive star clusters. To search for evidence of the clusters, we have compared optical images with the HI maps and measured magnitudes and colors of objects in and around the HI holes.

Although the SN scenario requires that detectable star clusters should often be present in the centers of the HI holes, our observations have in most cases failed to reveal these clusters at the expected magnitudes. In fact, many of the HI holes are located in regions of very low optical surface brightness, which show no evidence of recent star formation.

Type
Properties of Low Surface Brightness galaxies
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 221 - 223
Copyright
Copyright © Astronomical Society of the Pacific 1999

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