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A fresh view of magnetic fields and cosmic ray electrons in halos of spiral galaxies

Published online by Cambridge University Press:  03 March 2020

Ralf-Jürgen Dettmar ,
Volker Heesen  and
the CHANG-ES Team
Ralf-Jürgen Dettmar
Affiliation:
Ruhr-Universität Bochum, Universitätsstrasse 150, 44801 Bochum, Fakultät für Physik und Astronomie, Astronomisches Institut (AIRUB), Germany email: dettmar@astro.rub.de
Volker Heesen
Affiliation:
Universität Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany email: volker.heesen@hs.uni-hamburg.de
the CHANG-ES Team
Affiliation:
Judith Irwin (PI), Dept. of Physics, Engeneering Physics, & Astronomy, Queen’s University, Kingston, Ontario, Canada, K7L 3N6 email: irwinja@queensu.ca
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Abstract

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Recent numerical models of the multiphase ISM underline the importance of cosmic rays and magnetic fields for the physics of the ISM in disc galaxies. Observations of properties of the ISM in galactic halos constrain models of the expected exchange of matter between the star-forming disc and the environment (circumgalactic medium, CGM). We present new observational evidence from radio-continuum polarization studies of edge-on galaxies on magnetic field strength and structure as well as cosmic ray electron transport in galactic halos. The findings are discussed in the context of the disk-halo interaction of the interstellar medium. In addition, it is also briefly demonstrated how recent LOFAR observations of edge-on galaxies further constrain the extent of magnetic fields in galactic halos.

Keywords

galaxies: magnetic fieldsgalaxies: spiralgalaxies: halosradio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 315 - 318
Copyright
© International Astronomical Union 2020

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