Detection of nonthermal emission from the bow shock of a massive runaway star - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado




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Abstract: The environs of massive, early-type stars have been inspected in recent yearsin the search for sites where particles can be accelerated up to relativisticenergies. Wind regions of massive binaries that collide have already beenestablished as sources of high-energy emission; however, there is a differentscenario for massive stars where strong shocks can also be produced: thebow-shaped region of matter piled up by the action of the stellar strong windof a runaway star interacting with the interstellar medium. We study thebow-shock region produced by a very massive runaway star, BD+43 3654, to lookfor nonthermal radio emission as evidence of a relativistic particlepopulation. We observed the field of BD+43 3654 at two frequencies, 1.42 and4.86 GHz, with the Very Large Array VLA, and obtained a spectral index map ofthe radio emission. We have detected, for the first time, nonthermal radioemission from the bow shock of a massive runaway star. After analyzing theradiative mechanisms that can be at work, we conclude that the region understudy could produce enough relativistic particles whose radiation might bedetectable by forthcoming gamma-ray instruments, like CTA North.



Autor: Paula Benaglia, Gustavo E. Romero, Josep Marti, Cintia S. Peri, Anabella T. Araudo

Fuente: https://arxiv.org/







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