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VLA HI Imaging of the Low Surface Brightness Dwarf Galaxy DDO 47

Published online by Cambridge University Press:  12 April 2016

F. Walter  and
E. Brinks
F. Walter
Affiliation:
Radioastronomisches Institut, Bonn, Germany
E. Brinks
Affiliation:
Departamento de Astronomía, Guanajuato, México

Abstract

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We present high resolution VLA-observations of the nearby Low Surface Brightness Dwarf Galaxy DDO 47. This object shows many hole-like structures in its neutral interstellar medium. The majority of the detected H I-shells are found to be expanding. Their origin is therefore believed to be due to stellar winds of the most massive stars and their subsequent supernova (SN type II) explosions within regions of recent star formation (SF). Current SF in DDO 47 is predominantly present on the rims of the HI-shells suggesting propagating SF. At a projected distance of 20 kpc (adopting a distance to DDO 47 of 4 Mpc), a companion galaxy was detected at almost the same systemic velocity (DDO 47 B). A search for an optical identification suggests that CGCG 087-033 is the optical counterpart of the companion. A preliminary dynamical analysis based on DDO 47’s rotation curve yields that it is dark matter dominated (about 80% of its dynamical mass is in some non-visible form). A simple mass model suggests that DDO 47 is one of the ‘thickest’ dwarf galaxies studied so far.

Type
Properties of Low Surface Brightness galaxies
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 224 - 227
Copyright
Copyright © Astronomical Society of the Pacific 1999

References

Kim, S., Staveley-Smith, L., Sault, R.J., Kesteven, M.J., McConnell, D., & Freeman, K.C. 1997, PASA, 14, 119 Google Scholar
Puche, D., Westpfahl, D., Brinks, E., & Roy, J.-R. 1992, AJ, 103, 1841 Google Scholar
Rhode, K.L., Salzer, J.J., & Westpfahl, D.J. 1997, BAAS, 191, 81.09Google Scholar
Strobel, N.V., Hodge, P., Kennicutt, R.C. Jr. 1991, ApJ, 383, 148 Google Scholar
Tenorio-Tagle, G., & Bodenheimer, P. 1988, ARA&A, 26, 145 Google Scholar
Walter, F. & Brinks, E. 1998, AJ, submittedGoogle Scholar