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Distribution and Motions of Atomic Hydrogen in Lenticular Galaxies

  • Hugo van Woerden (a1), Wim van Driel (a1) and Ulrich J. Schwarz (a1)

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.

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References

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Distribution and Motions of Atomic Hydrogen in Lenticular Galaxies

  • Hugo van Woerden (a1), Wim van Driel (a1) and Ulrich J. Schwarz (a1)

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