Radio waves in galaxies, a new theory by Unical researchers
A new theory on shock wave particle acceleration developed by Gaetano Zimbardo and Silvia Perri, researchers from the University of Calabria, gives an important contribution to explain the phenomenon of radio emissions in galaxy clusters to the international scientific community. The study deserved publication in the prestigious scientific journal Nature Astronomy.
Some recent observations in astrophysics led scientists to state that the characteristics of this acceleration could not be explained by the standard theory of shock wave diffusive acceleration. In this context, the “superdiffusive acceleration” theory developed by the Italian researchers, already tested on the ionized gas bubble of solar origin that hits the solar system, seems to provide a plausible interpretative key to this complex phenomenon.
“Galaxy clusters – said the researchers – are the greatest concentrations of matter in the Universe and are subject to mutual gravitational attraction. By precipitating one on the other, these clusters form huge shock waves in the intergalactic gas which can accelerate relativistic energy electrons. In the intergalactic magnetic field, these spiralling electrons emit synchrotron radiations (in which the magnetic field and the acceleration electric field are synchronized). Our study is based on a new theory on shock wave particle acceleration in which the particles spread in a superdiffusive way, i.e. very rapidly, thus increasing the efficiency of acceleration”.