A survey of recombination line emission from the galactic plane at 325 MHz |
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| Authors: | K R Anantharamaiah |
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| Institution: | (1) Raman Research Institute, 560080 Bangalore |
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| Abstract: | A survey of the H 272 α recombination line at 325 MHz has been made towards 53 directions in the galactic plane using the
Ooty Radio Telescope (ORT). 34 of these directions correspond to well-known Hn regions, 12 to SNRs and 6 to ‘blank’ areas
selected so that the 5 GHz continuum is a minimum over the telescope beam of 2ℴ x 6 arcmin. Observing procedure and spectra
of 47 sources towards which lines are detected are presented. Hydrogen recombination lines have been detected towards all
the observed directions havingl <40ℴ. Carbon recombination lines are identified in 12 of the directions. The hydrogen line intensities are found to correlate
well with the total continuum intensity (which includes the nonthermal galactic background) indicating that most of the lines
arise due to stimulated emission by the background radiation. A preliminary discussion on the nature of the line-emitting
regions is also presented. |
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| Keywords: | Galaxy radio recombination lines radio observations low-frequency stimulated emission |
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