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For star-forming regions, there is a correlation of radio and FIR-emissionestablished. The radio emission is caused by synchrotron radiation ofelectrons, while the FIR emission is attributed to HII regions of OB stars andhot dust powered by those stars. Another possible correlation for star-formingregions might exist between the aforementioned radio emission and the gamma rayemission in the GeV regime. The GeV gamma ray emission of star-forming regionsis dominated by the decay of neutral pions formed in collisions of cosmic ray(CR) protons accelerated at supernova remnants (SNRs) with ambient hydrogen,while the electrons generating the synchrotron emission are assumed to beaccelerated at the same SNRs. Assuming the same spectral shape for the CRproton and electron distribution and a fixed ratio of CR protons to electrons,the proton- and electron-calorimetry of the star-forming regions can be tested.Furthermore, this provides a method to derive the magnetic field strength inthe star-forming region complementary to the existing methods.

A possible GeV-radio correlation for starburst galaxies