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Observations of high velocities inHii regions with a two-etalon Fabry-Pérot spectrometer

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Abstract

High internal motions of the ionized material in theHii regions M 8, M16, M 17 and the Orion Nebula were searched for with a two-etalon Fabry-Perot monochromotor. The profiles of the [Oiii], 5007 Å and in one case the 4959 Å line were obtained at many positions from these nebulae. Non-gaussian wings of up to −60 km/s were found on the profiles from M 17 and M 16 over regions several minutes across. Line doubling of up to 20 km/s was definitely found in M17 and M 8. Small components with radial velocities of up to −55 km/s with respect to the means were suspected in M 8 and the Orion Nebula.

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Meaburn, J. Observations of high velocities inHii regions with a two-etalon Fabry-Pérot spectrometer. Astrophys Space Sci 13, 110–127 (1971). https://doi.org/10.1007/BF00656317

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Keywords

  • High Velocity
  • Radial Velocity
  • Small Component
  • Internal Motion
  • Line Doubling