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Synchrotron intensity gradient revealing magnetic fields in galaxy clusters
Brunetti, G.; Bonafede, A.; Stuardi, C. +3 more
Magnetic fields and their dynamical interplay with matter in galaxy clusters contribute to the physical properties and evolution of the intracluster medium. However, the current understanding of the origin and properties of cluster magnetic fields is still limited by observational challenges. In this article, we map the magnetic fields at hundreds…
The supernova remnant SN 1006 as a Galactic particle accelerator
Greco, Emanuele; Vink, Jacco; Miceli, Marco +6 more
The origin of cosmic rays is a pivotal open issue of high-energy astrophysics. Supernova remnants are strong candidates to be the Galactic factory of cosmic rays, their blast waves being powerful particle accelerators. However, supernova remnants can power the observed flux of cosmic rays only if they transfer a significant fraction of their kinet…
X-ray flares from the stellar tidal disruption by a candidate supermassive black hole binary
Shu, Xinwen; Jiang, Ning; Li, Shuo +8 more
Optical transient surveys have led to the discovery of dozens of stellar tidal disruption events (TDEs) by massive black hole in the centers of galaxies. Despite extensive searches, X-ray follow-up observations have produced no or only weak X-ray detections in most of them. Here we report the discovery of delayed X-ray brightening around 140 days …
Discovery of X-ray pulsations from a massive star
Huenemoerder, David P.; Ignace, Richard; Hamann, Wolf-Rainer +4 more
X-ray emission from stars much more massive than the Sun was discovered only 35 years ago. Such stars drive fast stellar winds where shocks can develop, and it is commonly assumed that the X-rays emerge from the shock-heated plasma. Many massive stars additionally pulsate. However, hitherto it was neither theoretically predicted nor observed that …