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Radio Recombination Lines from Starburst Galaxies: High and Low Density Ionized Gas

Published online by Cambridge University Press:  26 May 2016

N.R. Mohan ,
K.R. Anantharamaiah  and
W.M. Goss
N.R. Mohan
Affiliation:
Raman Research Institute, Bangalore 560080, India & Indian Institute of Science, Bangalore 560012, India
K.R. Anantharamaiah
Affiliation:
Raman Research Institute, Bangalore 560080, India
W.M. Goss
Affiliation:
NRAO, Socorro, NM 81801, USA

Abstract

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Radio recombination lines (RRL) at 8 GHz and 15 GHz detected from four starburst galaxies are shown to arise in compact high density HII regions, which are undetectable below ∼4 GHz. Detection of an RRL at 1.4 GHz towards one galaxy and upper limits in the other three are consistent with the presence of an equal amount of low density diffuse gas. Continuum flux density measurements using the GMRT will be important in constraining the properties of the diffuse gas.

Type
Part 4: Extragalactic Radio Sources
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 243 - 244
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Anantharamaiah, K. R., Zhao, J. H., Goss, W. M., & Viallefond, F. 1993, ApJ, 419, 585 CrossRefGoogle Scholar
Zhao, J. H., Anantharamaiah, K. R., Goss, W. M., & Viallefond, F. 1996, ApJ, 472, 54 Google Scholar