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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 ,
Wim van Driel  and
Ulrich J. Schwarz
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

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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
Information
Symposium - International Astronomical Union , Volume 100: Internal Kinematics and Dynamics of Galaxies , 1983 , pp. 99 - 104
Copyright
Copyright © Reidel 1983 

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