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Fast radio bursts at the dawn of the 2020s

Lorimer, D. R.; Hessels, J. W. T.; Petroff, E.

Since the discovery of the first fast radio burst (FRB) in 2007, and their confirmation as an abundant extragalactic population in 2013, the study of these sources has expanded at an incredible rate. In our 2019 review on the subject, we presented a growing, but still mysterious, population of FRBs—60 unique sources, 2 repeating FRBs, and only 1 i…

Low-energy cosmic rays: regulators of the dense interstellar medium

Gabici, Stefano

Low-energy cosmic rays (up to the GeV energy domain) play a crucial role in the physics and chemistry of the densest phase of the interstellar medium. Unlike interstellar ionising radiation, they can penetrate large column densities of gas, and reach molecular cloud cores. By maintaining there a small but not negligible gas ionisation fraction, th…

High-mass X-ray binaries in the Milky Way. A closer look with INTEGRAL

Tsygankov, Sergey S.; Lutovinov, Alexander A.; Walter, Roland +1 more

High-mass X-ray binaries are fundamental in the study of stellar evolution, nucleosynthesis, structure and evolution of galaxies and accretion processes. Hard X-rays observations by INTEGRAL and Swift have broadened significantly our understanding in particular for the super-giant systems in the Milky Way, whose number has increased by almost a fa…