Sensitive observations of radio recombination lines in Orion and W51 : the data and detection of systematic recombination line blueshifts proportional to impact broadening

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DOIResolve DOI: http://doi.org/10.1007/s10509-011-0662-5
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TypeArticle
Journal titleAstrophysics and Space Science
ISSN0004-640X
Volume333
Issue2
Pages377388; # of pages: 12
SubjectHII regions; ISM: abundances; radio lines: ISM
AbstractSensitive spectral observations made in two frequency bands near 6.0 and 17.6 GHz are described for Orion and W51. Using frequency switching we were able to achieve a dynamic range in excess of 10,000 without fitting sinusoidal or polynomial baselines. This enabled us to detect lines as weak as TA ∼ 1 mK in these strong continuum sources. Hydrogen recombination lines with n as high as 25 have been detected in Orion. In the Orion data, where the lines are stronger, we have also detected a systematic shift in the line center frequencies proportional to linewidth that cannot be explained by normal optical depth effects.
Publication date
PublisherSpringer
LanguageEnglish
AffiliationNRC Herzberg Institute of Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number19739593
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Record identifierd7a0976d-b03f-43ed-b62a-4ff83c6ee69a
Record created2012-03-29
Record modified2016-05-09
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