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dc.contributor.author
del Palacio, Santiago  
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García, Federico  
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De Becker, M.  
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Altamirano, D.  
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Bosch Ramon, Valentí  
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Benaglia, Paula  
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Marcote, B.  
dc.contributor.author
Romero, Gustavo Esteban  
dc.date.available
2023-11-14T14:54:56Z  
dc.date.issued
2023-04  
dc.identifier.citation
del Palacio, Santiago; García, Federico; De Becker, M.; Altamirano, D.; Bosch Ramon, Valentí; et al.; Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep; EDP Sciences; Astronomy and Astrophysics; 672; A109; 4-2023; 1-12  
dc.identifier.issn
0004-6361  
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http://hdl.handle.net/11336/218056  
dc.description.abstract
Context. Massive colliding-wind binaries (CWBs) can be non-thermal sources. The emission produced in their wind-collision region (WCR) encodes information of both the shock properties and the relativistic electrons accelerated in them. The recently discovered system Apep, a unique massive system hosting two Wolf-Rayet stars, is the most powerful synchrotron radio emitter among the known CWBs. It is an exciting candidate in which to investigate the non-thermal processes associated with stellar wind shocks. Aims. We intend to break the degeneracy between the relativistic particle population and the magnetic field strength in the WCR of Apep by probing its hard X-ray spectrum, where inverse-Compton (IC) emission is expected to dominate. Methods. We observed Apep with NuSTAR for 60 ks and combined this with a reanalysis of a deep archival XMM-Newton observation to better constrain the X-ray spectrum. We used a non-thermal emission model to derive physical parameters from the results. Results. We detect hard X-ray emission consistent with a power-law component from Apep. This is compatible with IC emission produced in the WCR for a magnetic field of ≈ 105-190 mG, corresponding to a magnetic-to-thermal pressure ratio in the shocks of ≈ 0.007-0.021, and a fraction of ∼1.5 × 10-4 of the total wind kinetic power being transferred to relativistic electrons. Conclusions. The non-thermal emission from a CWB is detected for the first time in radio and at high energies. This allows us to derive the most robust constraints so far for the particle acceleration efficiency and magnetic field intensity in a CWB, reducing the typical uncertainty of a few orders of magnitude to just within a factor of a few. This constitutes an important step forward in our characterisation of the physical properties of CWBs.  
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application/pdf  
dc.language.iso
eng  
dc.publisher
EDP Sciences  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
ACCELERATION OF PARTICLES  
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OUTFLOWS  
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RADIATION MECHANISMS: NON-THERMAL  
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STARS: WINDS  
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STARS: WOLF-RAYET  
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X-RAYS: STARS  
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Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep  
dc.type
info:eu-repo/semantics/article  
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info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-11-13T15:50:48Z  
dc.journal.volume
672  
dc.journal.number
A109  
dc.journal.pagination
1-12  
dc.journal.pais
Francia  
dc.description.fil
Fil: del Palacio, Santiago. Chalmers University of Technology; Suecia  
dc.description.fil
Fil: García, Federico. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina  
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Fil: De Becker, M.. Université de Liège; Bélgica  
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Fil: Altamirano, D.. University of Southampton; Reino Unido  
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Fil: Bosch Ramon, Valentí. Universidad de Barcelona; España  
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Fil: Benaglia, Paula. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina  
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Fil: Marcote, B.. Joint Institute For Vlbi Eric; Países Bajos  
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Fil: Romero, Gustavo Esteban. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina  
dc.journal.title
Astronomy and Astrophysics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2023/04/aa45505-22/aa45505-22.html  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1051/0004-6361/202245505