Published in
American Astronomical Society, Astrophysical Journal Letters, 2(795), p. L33, 2014
DOI: 10.1088/2041-8205/795/2/l33
Cambridge University Press, Proceedings of the International Astronomical Union, S309(10), p. 141-144, 2014
DOI: 10.1017/s174392131400948x
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Discovery of Carbon Radio Recombination Lines in M82
,
Reinout J. van Weeren,
J. B. R. Oonk ,
M. Carmen Toribio,
Francisco Salgado ,
M. Carmen Toribio ,
Huub J. A. Rottgering,
A. G. G. M. Tielens,
Rainer Beck,
Bjorn Adebahr,
Philip Best,
Robert Beswick,
Annalisa Bonafede,
Gianfranco Brunetti,
Marcus Brüggen
and other authors.
Full text: Download
Abstract
AbstractCold, diffuse HI clouds are a key component of the interstellar medium (ISM), and play an important role in the evolution of galaxies. Carbon radio recombination lines (CRRLs) trace this ISM stage, and with the enormous sensitivity of LOFAR we have already begun to map and constrain the physical properties of this gas in our own Galaxy. Using LOFAR's low band antenna, we have observed M 82 and present the first ever extragalactic detection of CRRLs. We stack 22 lines to find a 8.5-sigma detection. The line peak to continuum ratio is ∼0.003, with a FWHM of 31 km s−1. The CRRL feature is consistent with an origin in the cold, neutral medium in the direction of the nucleus of M 82.