Stellar feedback in dwarf irregular galaxies with radio continuum observations
Paper in proceedings, 2019

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.

cosmic rays

radio continuum: galaxies

galaxies: magnetic fields

Author

Volker Heesen

Universität Hamburg

Aritra Basu

Bielefeld University

Elias Brinks

University of Hertfordshire

George Heald

CSIRO

Andrew Fletcher

Newcastle University

Cathy Horellou

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Matthias Hoeft

Thüringer Landessternwarte Tautenburg

Krzysztof Chyzy

Jagiellonian University in Kraków

Proceedings of the International Astronomical Union

1743-9213 (ISSN) 1743-9221 (eISSN)

Vol. 14 S344 255-258

344th Symposium of the International-Astronomical-Union (IAU)
Vienna, Austria,

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1017/S1743921318006841

More information

Latest update

6/30/2020