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We performed a high-sensitivity search for galaxy-scale magnetic fields byradio polarimetry at 10.45GHz and 4.85GHz with the Effelsberg 100m radiotelescope, accompanied by Halpha imaging, for the two Local Group irregulargalaxies IC10 and NGC6822. Their star-forming bodies are small and rotateslowly. IC10 is known to have a very high star-forming activity, resemblingblue compact dwarfs, while NGC6822 has a low overall star-formation level.Despite very different current star formation rates, our Halpha imagingrevealed a large web of diffuse Halpha filaments and shells in both IC10 andNGC6822. Some of them extend far away from the galaxy's main body. The totalpower emission of both objects shows bright peaks either at the positions ofoptically strong star-forming clumps (IC10) or individual HII regions orsupernova remnants (NGC6822). However, in both cases we detect a smoothlydistributed, extended component. In IC10 we found clear evidence for thepresence of a diffuse, mostly random magnetic field of ~14muG strength,probably generated by a fluctuation dynamo. One of the Halpha-emittingfilaments appears to be associated with enhanced magnetic fields. We alsorediscuss the reddening of IC10 and its implications for its distance. In thecase of NGC6822 we found only very weak evidence for nonthermal emission,except perhaps for some regions associated with local gas compression. Wedetect in both galaxies small spots of polarized emission, indicative ofregular fields (~3muG), at least partly associated with local compressionalphenomena.

Magnetic fields and ionized gas in the local group irregular galaxies IC 10 and NGC 6822