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Limits on the Temperature and Filling Factor of the Warm Ionized Medium Towards the Galactic Centre

  • K. R. Anantharamaiah
  • H. E. Payne
  • D. Bhattacharya
Part of the Astrophysics and Space Science Library book series (ASSL, volume 163)

Abstract

We have detected a hydrogen recombination line, near 145 MHz, in the direction of the galactic centre with an optical depth of -2.7 ± 0.3 × 10-4. This is shown to arise in a nearby HII region with an electron density of 7 cm-3. The absence of any significant contribution to this line from the warm ionized medium (WIM) implies that it must have a temperature > 6700K and a filling factor >25%. If the temperature of the WIM is 8000K, then it must have a filling factor >60%.

Keywords

Optical Depth Filling Factor Galactic Centre Recombination Line Average Electron Density 
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

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • K. R. Anantharamaiah
    • 1
  • H. E. Payne
    • 2
  • D. Bhattacharya
    • 1
  1. 1.Raman Research InstituteBangaloreIndia
  2. 2.Space Telescope Science InstituteBaltimoreUSA

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