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%.
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© 1990 Kluwer Academic Publishers
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Anantharamaiah, K.R., Payne, H.E., Bhattacharya, D. (1990). Limits on the Temperature and Filling Factor of the Warm Ionized Medium Towards the Galactic Centre. In: Gordon, M.A., Sorochenko, R.L. (eds) Radio Recombination Lines: 25 Years of Investigation. Astrophysics and Space Science Library, vol 163. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0625-9_25
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DOI: https://doi.org/10.1007/978-94-009-0625-9_25
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