2010/07/01 by Paula Benaglia, P. Benaglia, Gustavo E. Romero +6 · 82 citations
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Bow shock (aerodynamics) #Context (archaeology) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Interstellar medium #Physics #Population #Radiative transfer #Shock wave #Stars #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/201015232
published in Astronomy and Astrophysics 517, L10 (EDP Sciences) · Accepted in Astronomy and Astrophysics Letters
openalex publication_date 2010/07/01 · arxiv created 2010/07/19 · arxiv updated 2015/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
<i>Context. <i/>The environs of massive, early-type stars have been inspected in recent years in the search for sites where particles can be accelerated up to relativistic energies. Wind regions of massive binaries that collide have already been established as sources of high-energy emission; however, there is a different scenario for massive stars where strong shocks can also be produced: the bow-shaped region of matter piled up by the action of the stellar strong wind of a runaway star interacting with the interstellar medium.<i>Aims. <i/>We study the bow-shock region produced by a very massive runaway star, BD+43°3654, to look for nonthermal radio emission as evidence of a relativistic particle population.<i>Methods. <i/>We observed the field of BD+43°3654 at two frequencies, 1.42 and 4.86 GHz, with the Very Large Array (VLA), and obtained a spectral index map of the radio emission.<i>Results. <i/>We have detected, for the first time, nonthermal radio emission from the bow shock of a massive runaway star.<i>Conclusions. <i/>After analyzing the radiative mechanisms that can be at work, we conclude that the region under study could produce enough relativistic particles whose radiation might be detectable by forthcoming gamma-ray instruments, like CTA North.