Particle-Accelerating Colliding-Wind Binaries : a relevant science case for radio observations

Synchrotron radiation identified in the radio domain for several tens of binary systems made of massive stars provides compelling evidence that a particle acceleration process is at work in these objects, hence their Particle-Accelerating Colliding-Wind Binary (PACWB) status. The processes at work for both particle acceleration and non-thermal emission are basically the same as for supernova remnants, but with different geometries and different physical parameters. Measurements of the synchrotron radio emission of PACWBs allow to investigate the non-thermal physics of these systems and to derive some of their properties. In this context, it is worth describing their emission properties at centimetric wavelengths, along with some expectations at longer wavelengths such as those measured by the Giant Metrewave Radio Telescope. This poster briefly reviews this science topic and outlines expectations about radio observations of these objects in their appropriate context.