Tag: raggi cosmici

The acceleration of cosmic rays in supernova remnants depends on the interaction with the surrounding medium. The study: “Time evolution of the synchrotron X-ray emission in Kepler’s SNR: the effects of turbulence and shock velocity” of V. Sapienza (UNIPA/INAF-OAPA) appeared on ApJ

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The role of supernova remnants (expanding clouds produced by supernovae) in the acceleration of cosmic rays (high-energy particles present in various astrophysical environments) has been known since 1995. The discovery, made by astronomers from Kyoto University, was made possible by identifying the presence of non-thermal X-ray emission in the supernova remnant SN 1006. X-rays are a type of high-energy radiation

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A study on the processes responsible for the acceleration of particles in shocks. The study: “Individual particle approach to the diffusive shock acceleration. Effect of the non-uniform flow velocity downstream of the shock” of O. Petruk (INAF-OAPA) appeared on A&A

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Our planet is constantly bombarded by highly energetic particles known as ‘cosmic rays‘. The spectrum of cosmic rays up to energies of 1015 electronvolts (eV) is formed by the sources in our Galaxy, while particles with observed energies up to 1021 eV should have extra-galactic origin. The cosmic ray spectrum follows a power law, meaning that the flux of particles with a given

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Different regimes of particle acceleration in supernova remnants. The study: “A Spatially Resolved Study of Hard X-Ray Emission in Kepler’s Supernova Remnant: Indications of Different Regimes of Particle Acceleration” of V. Sapienza (UNIPA/OAPA) appeared on ApJ

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Cosmic rays are high-energy charged particles which continuously hit our planet. These particles are accelerated up to such high velocities in different astronomical environments, among which supernova remnants seems to be particularly important. These objects are nebulae in rapid expansion generated by the explosions of very massive stars. In supernova remnants, particle acceleration seems to occurr along the expanding shock

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Supernova remnants as particle accelerators. The study: “The supernova remnant SN 1006 as a Galactic particle accelerator” of R. Giuffrida (UniPA/INAF-OAPA) recently appeared on Nature Communication

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Our planet is constantly bombarded by energetic particles (mainly protons) called “cosmic rays“. The study of cosmic rays is a leading science topic given its importance in several fields, such as the study of the effects on instrumentation and astronauts in space, where the natural protection against these particles provided by the magnetic field of Earth is low or null.

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A laboratory experiment to test particle acceleration in astrophysical environments. The study: “Laboratory evidence for proton energization by collisionless shock surfing” of W. Yao and J. Fuchs (École Polytechnique, Sorbonne Université) recently appeared on Nature Physics

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Energetic particles, called “cosmic rays”, constantly rain down on our planet. Thanks to several years of theoretical studies and observations, we know that these particles can be accelerated by shocks propagating in certain astrophysical environments. The classical example of such environment are the supernovae remnants, which are expanding clouds created by supernova explosions, which are often interacting with surrounding material.

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Modelli magnetoidrodinamici di interazione tra resti di supernovae e nubi. Pubblicato su MNRAS “Post-adiabatic supernova remnants in an interstellar magnetic field: oblique shocks and non-uniform environment” di O. Petruk (Institute for Applied Problems in Mechanics and Mathematics – Ucraina)

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di Mario Giuseppe Guarcello    ( segui mguarce)     I resti di supernova, ossia uno dei due prodotti di un’esplosione di supernova assieme all’oggetto compatto formato dal nucleo della stella esplosa, sono ritenuti i principali responsabili della produzione di raggi cosmici, che vengono accelerati fino ad energie di 3×1015 eV. L’accelerazione di raggi cosmici caratterizza tutta l’evoluzione dei resti di supernova,

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