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Discovery of Carbon Radio Recombination Lines in M82

Published online by Cambridge University Press:  09 February 2015

Leah K. Morabito ,
J. B. R. Oonk ,
Francisco Salgado ,
M. Carmen Toribio ,
Xander Tielens  and
Huub Röttgering
Leah K. Morabito
Affiliation:
Leiden Observatory, Leiden University, P. O. Box 9513, 2300 RA Leiden, The Netherlands email: morabito@strw.leidenuniv.nl
J. B. R. Oonk
Affiliation:
Leiden Observatory, Leiden University, P. O. Box 9513, 2300 RA Leiden, The Netherlands email: morabito@strw.leidenuniv.nl Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo, The Netherlands
Francisco Salgado
Affiliation:
Leiden Observatory, Leiden University, P. O. Box 9513, 2300 RA Leiden, The Netherlands email: morabito@strw.leidenuniv.nl
M. Carmen Toribio
Affiliation:
Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo, The Netherlands
Xander Tielens
Affiliation:
Leiden Observatory, Leiden University, P. O. Box 9513, 2300 RA Leiden, The Netherlands email: morabito@strw.leidenuniv.nl
Huub Röttgering
Affiliation:
Leiden Observatory, Leiden University, P. O. Box 9513, 2300 RA Leiden, The Netherlands email: morabito@strw.leidenuniv.nl
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Abstract

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Cold, 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.

Keywords

galaxies: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 141 - 144
Copyright
Copyright © International Astronomical Union 2015 

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