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Abstract <p>Compact clusters of young massive stars are considered as perspective sources of galactic cosmic rays. Recent detection of the well-known cluster Westerlund 2 (Wd2) with Mikhail Pavlinsky ART-XC telescope aboard the Spectrum Roentgen-Gamma orbital observatory revealed the presence of X-ray emission above 10 keV. The joint analysis of Chandra and ART-XC observations together with 3D-MHD modeling of the cluster pointed to the nonthermal origin of hard X-ray emission. We argue here that the nonthermal component can be produced by synchrotron radiation of multi-TeV electrons accelerated in Wd2 by multiple colliding stellar winds. Our model allows explaining the X-ray observations and is consistent with the observed gamma-ray emission of the source.</p>

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What Can We Learn about Cosmic Ray Acceleration in Westerlund 2 from SRG/ART-XC Data?

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • M. E. Kalyashova,
  • A. M. Bykov,
  • Yu. A. Uvarov,
  • D. V. Badmaev,
  • I. Yu. Lapshov,
  • A. A. Lutovinov

摘要

Abstract

Compact clusters of young massive stars are considered as perspective sources of galactic cosmic rays. Recent detection of the well-known cluster Westerlund 2 (Wd2) with Mikhail Pavlinsky ART-XC telescope aboard the Spectrum Roentgen-Gamma orbital observatory revealed the presence of X-ray emission above 10 keV. The joint analysis of Chandra and ART-XC observations together with 3D-MHD modeling of the cluster pointed to the nonthermal origin of hard X-ray emission. We argue here that the nonthermal component can be produced by synchrotron radiation of multi-TeV electrons accelerated in Wd2 by multiple colliding stellar winds. Our model allows explaining the X-ray observations and is consistent with the observed gamma-ray emission of the source.