Detection of nonthermal emission from the bow shock of a massive runaway star

  • Benaglia P
  • Romero G
  • Martí J
 et al. 
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Context. 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.
Aims: We study the
bow-shock region produced by a very massive runaway star,
BD+43{\deg}3654, to look for nonthermal radio emission as evidence of a
relativistic particle population.
Methods: We observed the field
of BD+43{\deg}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
Results: We have detected, for the first time,
nonthermal radio emission from the bow shock of a massive runaway star.

Conclusions: 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.

Author-supplied keywords

  • 3654
  • 43
  • bd
  • early-type
  • general
  • individual
  • infrared
  • radio continuum
  • stars

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  • P. Benaglia

  • G. E. Romero

  • J. Martí

  • C. S. Peri

  • a. T. Araudo

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