A survey of recombination line emission from the galactic plane at 325 MHz

Anantharamaiah, K. R. (1985) A survey of recombination line emission from the galactic plane at 325 MHz Journal of Astrophysics and Astronomy, 6 (4). pp. 177-201. ISSN 0250-6335

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Official URL: http://www.ias.ac.in/jarch/jaa/6/177-201.pdf

Related URL: http://dx.doi.org/10.1007/BF02715005


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 2° × 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 having l<40°. 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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Galaxy; Radio Recombination Lines; Radio Observations; Low-frequency; Stimulated Emission
ID Code:27954
Deposited On:15 Dec 2010 12:42
Last Modified:17 May 2016 11:08

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