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Kinematics of Giant Low Surface Brightness Galaxies

Published online by Cambridge University Press:  12 April 2016

T.E. Pickering
T.E. Pickering*
Affiliation:
Kapteyn Institute, Postbus 800, 9700 AV Groningen, The Netherlands

Abstract

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High sensitivity H I observations now exist for six giant low surface brightness (LSB) disk galaxies including the two prototypes, Malin 1 (Bothun et al. 1987; Impey & Bothun 1989) and F568-6 (also known as Malin 2; Bothun et al. 1990). Their H I surface brightnesses are generally low, but proportionally not as low as their optical surface brightnesses. Their total H I masses and radial extents are quite large, however, with MHI ∼ 1010M⊙h−275 and with detectable H I out to 100 kpc h−175 or more in a couple of cases. The rotation curves of these systems rise slowly and are consistent with negligible disk contribution, similar to many previously observed dwarf galaxies. However, the peak rotation velocities of these galaxies are high (>200 km s−1) and infer high dynamical masses. These galaxies provide the some of the first examples of galaxies that are both massive and dark matter dominated.

Type
Properties of Low Surface Brightness galaxies
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 214 - 220
Copyright
Copyright © Astronomical Society of the Pacific 1999

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