The high-energy emission from HD 93129A near periastron

<jats:title>ABSTRACT/jats:title <jats:p>We conducted an observational campaign towards one of the most massive and luminous colliding wind binaries in the Galaxy, HD 93129A, close to its periastron passage in 2018. During this time the source was predicted to be in its maximum of high-energy emission. Here we present our data analysis from the X-ray satellites Chandra and NuSTAR and the γ-ray satellite AGILE. High-energy emission coincident with HD 93129A was detected in the X-ray band up to ∼18 keV, whereas in the γ-ray band only upper limits were obtained. We interpret the derived fluxes using a non-thermal radiative model for the wind-collision region. We establish a conservative upper limit for the fraction of the wind kinetic power that is converted into relativistic electron acceleration, fNT,e &lt; 0.02. In addition, we set a lower limit for the magnetic field in the wind-collision region as BWCR &gt; 0.3 G. We also argue a putative interpretation of the emission from which we estimate fNT,e ≈ 0.006 and BWCR ≈ 0.5 G. We conclude that multiwavelength, dedicated observing campaigns during carefully selected epochs are a powerful tool for characterizing the relativistic particle content and magnetic field intensity in colliding wind binaries./jats:p



Work Title The high-energy emission from HD 93129A near periastron
Open Access
  1. S del Palacio
  2. F García
  3. D Altamirano
  4. R H Barbá
  5. V Bosch-Ramon
  6. M Corcoran
  7. M De Becker
  8. K Hamaguchi
  9. J Maíz Apellániz
  10. P Munar Adrover
  11. J M Paredes
  12. G E Romero
  13. H Sana
  14. M Tavani
  15. A ud-Doula
License CC BY-NC-SA 4.0 (Attribution-NonCommercial-ShareAlike)
Work Type Article
  1. Oxford University Press (OUP)
Publication Date May 5, 2020
Publisher Identifier (DOI)
  1. 10.1093/mnras/staa1156
  1. Monthly Notices of the Royal Astronomical Society
Deposited January 13, 2022




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Work History

Version 1

  • Created
  • Added A Ud-Doula - The high-energy emission.pdf
  • Added Creator S del Palacio
  • Added Creator F García
  • Added Creator D Altamirano
  • Added Creator R H Barbá
  • Added Creator V Bosch-Ramon
  • Added Creator M Corcoran
  • Added Creator M De Becker
  • Added Creator K Hamaguchi
  • Added Creator J Maíz Apellániz
  • Added Creator P Munar Adrover
  • Added Creator J M Paredes
  • Added Creator G E Romero
  • Added Creator H Sana
  • Added Creator M Tavani
  • Added Creator A ud-Doula
  • Published
  • Updated
  • Updated