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Distribution and Motions of Atomic Hydrogen in Lenticular Galaxies

Published online by Cambridge University Press:  04 August 2017

Hugo van Woerden
Affiliation:
Kapteyn Astronomical Institute, Groningen University, Groningen, the Netherlands
Wim van Driel
Affiliation:
Kapteyn Astronomical Institute, Groningen University, Groningen, the Netherlands
Ulrich J. Schwarz
Affiliation:
Kapteyn Astronomical Institute, Groningen University, Groningen, the Netherlands

Abstract

We report the results of HI observations of eleven gas-rich SO/SOa galaxies with the Westerbork Synthesis Telescope. The majority of these galaxies have most of their hydrogen outside the optical body, in annular configurations with diameters ~2 times the optical. These outer gas rings are often clumped, incomplete, and in approximately circular motion. They may represent the remnants of primordial, often warped, gas disks; or they may have formed from gas (or dwarf galaxies) accreted recently. Optical spectra could discriminate between these possibilities.

A few objects have filled gas disks, and several have inner HI rings with radii ~0.4 × optical. Two objects have peculiar distributions suggesting, respectively, tidal effects and stripping. However, stripping by intergalactic gas appears not to be a major current process.

Type
I. Kinematics of Gas and the Underlying Mass Distribution
Copyright
Copyright © Reidel 1983 

References

Burstein, D. and Krumm, N.A. 1981, Astrophys. J. 250, 517.CrossRefGoogle Scholar
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Larson, R.B., Tinsley, B.M., Caldwell, C.N. 1980, Astrophys. J. 237, 692.CrossRefGoogle Scholar
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Shane, W.W. 1980, Astron. Astrophys. 82, 314.Google Scholar
Silk, J. and Norman, C.A. 1979, Astrophys. J. 234, 86.CrossRefGoogle Scholar

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