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Comments on the paper ‘hydrodynamic and turbulent motions in the galactic disk’

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Two comments are prompted by the recent paper of Quiroga (1983). First, it is pointed out that Quiroga's identification of two distinct types of motion (hydrodynamic and turbulent) within the galactic disk supports the suggestion that turbulent motions in the Galaxy are generated by the shearig action of differential galactic rotation. Secondly, as a result of these turbulent motions dominating the systematic hydrodynamics of galactic rotation at scale sizes below 100–300 pc, it appears that some process(es) associated with interstellar turbulence rather than with galactic rotation should play a dominant role in the establishment of the angular momentum of interstellar material.

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Fleck, R.C. Comments on the paper ‘hydrodynamic and turbulent motions in the galactic disk’. Astrophys Space Sci 100, 417–419 (1984).

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  • Angular Momentum
  • Dominant Role
  • Distinct Type
  • Scale Size
  • Turbulent Motion