Abstract
In a special type of interacting galaxy systems, in which two galaxies collide face-on, radio synchrotron bridges between the two components have been observed. We propose that this radio emission is emitted by relativistic electrons accelerated in shocks produced by gas dynamic interaction of the respective interstellar media during the collision. The sites of acceleration would thus be fundamentally different from most other galaxies where relativistic particles are believed to be accelerated in supernova remnants. We present a model for the radio emission that is able to explain the observed power and spectral index. This kind of process could be relevant, in addition to the cases modelled and discussed here, for galaxies in clusters and groups and for galaxies at high redshift.
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Acknowledgements
UL acknowledges support by the research projects AYA2007-67625-C02-02 and AYA2011-24728 from the Spanish Ministerio de Ciencia y Educación and the Junta de Andalucía (Spain) grants FQM108.
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Lisenfeld, U., Völk, HJ. (2013). Shock Acceleration of Relativistic Particles in Galaxy Collisions. In: Torres, D., Reimer, O. (eds) Cosmic Rays in Star-Forming Environments. Astrophysics and Space Science Proceedings, vol 34. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35410-6_22
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DOI: https://doi.org/10.1007/978-3-642-35410-6_22
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