The Frequency of Warped HI Discs

  • A. Bosma
  • E. Athanassoula
Conference paper


We have recently made a small survey of ten edge-on galaxies, using the VLA in D-configuration (resolution 40″) in the 21-cm line. The purpose was to find non-warped galaxies extended in HI, suitable for a detailed study of the vertical equilibrium of their stellar and gas disks. Such a study might help to determine the shape of the dark halo component. As a byproduct, we have found several more examples of warped HI-discs. In Table 1 we collect the data on edge-on galaxies either observed by us, or already published elsewhere. For small warp amplitudes resolution effects become important: e.g. for NGC 100 our 40″ data does not indicate a warp, but recent mapping at 4″ resolution show a warp of small amplitude, as well as the expected flaring of the HI disc.


Small Amplitude Mass Model Core Radius Clear Case Function Ratio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • A. Bosma
    • 1
  • E. Athanassoula
    • 1
  1. 1.Observatoire de MarseilleMarseille Cedex 4France

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