Please use this identifier to cite or link to this item:
https://hdl.handle.net/2445/162273
Title: | The high-energy emission from HD 93129A near periastron |
Author: | Del Palacio, S. García, F. Altamirano, Diego Barbá, R. H. Bosch i Ramon, Valentí Corcoran, Michael F. De Becker, M. Hamaguchi, K. Maíz Apellániz, J. Munar i Adrover, Pere Paredes i Poy, Josep Maria Romero, Gustavo E. Sana, H. Tavani, M. Ud-Doula, A. |
Keywords: | Acceleradors de partícules Estels binaris de raigs X Raigs gamma Particle accelerators X-ray binaries Gamma rays |
Issue Date: | 1-May-2020 |
Publisher: | Royal Astronomical Society |
Abstract: | 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 \textit{Chandra} and \textit{NuSTAR} and the γ-ray satellite \textit{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<0.02. In addition, we set a lower limit for the magnetic field in the wind-collision region as BWCR>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 multi-wavelength, dedicated observing campaigns during carefully selected epochs are a powerful tool for characterising the relativistic particle content and magnetic field intensity in colliding wind binaries. |
Note: | Reproducció del document publicat a: https://doi.org/10.1093/mnras/staa1156 |
It is part of: | Monthly Notices of the Royal Astronomical Society, 2020, vol. 494, num. 4, p. 6043-6052 |
URI: | https://hdl.handle.net/2445/162273 |
Related resource: | https://doi.org/10.1093/mnras/staa1156 |
ISSN: | 0035-8711 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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