Synchrotron Emission in a Random Magnetic Field - the Effect of Spectral Ageing on Radio Images

Details Synchrotron Emission in a Random Magnetic Field - the Effect of Spectral Ageing on Radio Images Synchrotron Emission in a Random Magnetic Field - the Effect of Spectral Ageing on Radio Images

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..110t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 1/JUL1, P. 110, 1994

Astronomy and Astrophysics

Astronomy

6

Scientific paper

Images of radio synchrotron emission from volumes containing a random maguetic field have been constructed. The evolution of the images as the emission ages depends on the relative importance of synchrotron losses, inverse Compton losses and diffusion of electrons between regions of different field strength. The polarization from the volume can vary substantially with frequency as the result of differential ageing of polarized components, although this will not be important for sheared field configurations. Synchrotron ageing naturally increases the emission contrast at high frequencies, so that instabilities need not be invoked to explain the brightness of filamentary structures. Key words: magnetic fields - radiation mechanisms: non-thermal - radio continuum: galaxies.

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