Wide spectrum H2O sources - astrophysical Raman masers

Radhakrishnan, V. ; Goss, W. M. ; Bhandari, Rajendra (1975) Wide spectrum H2O sources - astrophysical Raman masers Pramana - Journal of Physics, 5 (2). pp. 49-58. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/5/2/49-58/v...


The extraordinarily wide 22 GHz emission from W49A and two other galactic HII regions is discussed, and arguments presented why the entire width of these spectra cannot be attributed to the 616 → 523 transition of H2O. It is suggested that most of the weak emission with large frequency shifts is due to stimulated Raman scattering of the strong central features appearing at the expected frequency of the water vapour line. It has not been possible to identify the scattering agent, but it is predicted that the spectra of millimetre-wave maser sources should also show such frequency-shifted features.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Masers; Interstellar Molecules; Raman Scattering; HII regions; Radio Lines
ID Code:87003
Deposited On:14 Mar 2012 07:42
Last Modified:19 May 2016 02:24

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