Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/162273
 Title: The high-energy emission from HD 93129A near periastron Author: Del Palacio, S.García, F.Altamirano, DiegoBarbá, R. H.Bosch i Ramon, ValentíCorcoran, Michael F.De Becker, M.Hamaguchi, K.Maíz Apellániz, J.Munar i Adrover, PereParedes i Poy, Josep MariaRomero, Gustavo E.Sana, H.Tavani, M.Ud-Doula, A. Keywords: Acceleradors de partículesEstels binaris de raigs XRaigs gammaParticle acceleratorsX-ray binariesGamma 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: http://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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