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Stellar feedback in dwarf irregular galaxies with radio continuum observations

Published online by Cambridge University Press:  30 October 2019

Volker Heesen Open the ORCID record for Volker Heesen [Opens in a new window] ,
Aritra Basu ,
Elias Brinks ,
George Heald ,
Andrew Fletcher ,
Cathy Horellou ,
Matthias Hoeft  and
Krzysztof Chyży
Volker Heesen
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029Hamburg email: [email protected]
Aritra Basu
Affiliation:
Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany
Elias Brinks
Affiliation:
University of Hertfordshire, Hatfield AL10 9AB, UK
George Heald
Affiliation:
CSIRO, 26 Dick Perry Avenue, Kensington, WA 6151, Australia
Andrew Fletcher
Affiliation:
Newcastle University, Newcastle-upon-Tyne NE1 7RU, UK
Cathy Horellou
Affiliation:
Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden
Matthias Hoeft
Affiliation:
Thüringer Landessternwarte (TLS), Sternwarte 5, D-07778 Tautenburg, Germany
Krzysztof Chyży
Affiliation:
Astronomical Observatory, Jagiellonian University, ul. Orla 171, PL-30-244 Kraków, Poland
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Abstract

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Low-mass dwarf irregular galaxies are subject to outflows, in which cosmic rays may play a very important role; they can be traced via their electron component, the cosmic ray electrons (CRe), in the radio continuum as non-thermal synchrotron emission. With the advent of sensitive low-frequency observations, such as with the Low-Frequency Array (LOFAR), we can trace CRe far away from star formation sites. Together with GHz-observations, such as with the Very Large Array (VLA), we can study spatially resolved radio continuum spectra at matched angular resolution and sensitivity. Here, we present results from our 6-GHz VLA survey of 40 nearby dwarf galaxies and our LOFAR study of the nearby starburst dwarf irregular galaxy IC 10. We explore the relation of RC emission with star formation tracers and study in IC 10 the nature of a low-frequency radio halo, which we find to be the result of a galactic wind.

Keywords

cosmic raysgalaxies: magnetic fieldsradio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 255 - 258
Copyright
© International Astronomical Union 2019 

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