Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep
- Autores
- del Palacio, Santiago; García, Federico; De Becker, M.; Altamirano, D.; Bosch Ramon, Valentí; Benaglia, Paula; Marcote, B.; Romero, Gustavo Esteban
- Año de publicación
- 2023
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
Fil: del Palacio, Santiago. Chalmers University of Technology; Suecia
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
Fil: De Becker, M.. Université de Liège; Bélgica
Fil: Altamirano, D.. University of Southampton; Reino Unido
Fil: Bosch Ramon, Valentí. Universidad de Barcelona; España
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
Fil: Marcote, B.. Joint Institute For Vlbi Eric; Países Bajos
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 - Materia
-
ACCELERATION OF PARTICLES
OUTFLOWS
RADIATION MECHANISMS: NON-THERMAL
STARS: WINDS
STARS: WOLF-RAYET
X-RAYS: STARS - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/218056
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oai:ri.conicet.gov.ar:11336/218056 |
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Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apepdel Palacio, SantiagoGarcía, FedericoDe Becker, M.Altamirano, D.Bosch Ramon, ValentíBenaglia, PaulaMarcote, B.Romero, Gustavo EstebanACCELERATION OF PARTICLESOUTFLOWSRADIATION MECHANISMS: NON-THERMALSTARS: WINDSSTARS: WOLF-RAYETX-RAYS: STARShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. 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.Fil: del Palacio, Santiago. Chalmers University of Technology; SueciaFil: 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; ArgentinaFil: De Becker, M.. Université de Liège; BélgicaFil: Altamirano, D.. University of Southampton; Reino UnidoFil: Bosch Ramon, Valentí. Universidad de Barcelona; EspañaFil: 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; ArgentinaFil: Marcote, B.. Joint Institute For Vlbi Eric; Países BajosFil: 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; ArgentinaEDP Sciences2023-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/218056del 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; 1-120004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2023/04/aa45505-22/aa45505-22.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202245505info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:08:30Zoai:ri.conicet.gov.ar:11336/218056instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:08:30.228CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep |
title |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep |
spellingShingle |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep del Palacio, Santiago ACCELERATION OF PARTICLES OUTFLOWS RADIATION MECHANISMS: NON-THERMAL STARS: WINDS STARS: WOLF-RAYET X-RAYS: STARS |
title_short |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep |
title_full |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep |
title_fullStr |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep |
title_full_unstemmed |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep |
title_sort |
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep |
dc.creator.none.fl_str_mv |
del Palacio, Santiago García, Federico De Becker, M. Altamirano, D. Bosch Ramon, Valentí Benaglia, Paula Marcote, B. Romero, Gustavo Esteban |
author |
del Palacio, Santiago |
author_facet |
del Palacio, Santiago García, Federico De Becker, M. Altamirano, D. Bosch Ramon, Valentí Benaglia, Paula Marcote, B. Romero, Gustavo Esteban |
author_role |
author |
author2 |
García, Federico De Becker, M. Altamirano, D. Bosch Ramon, Valentí Benaglia, Paula Marcote, B. Romero, Gustavo Esteban |
author2_role |
author author author author author author author |
dc.subject.none.fl_str_mv |
ACCELERATION OF PARTICLES OUTFLOWS RADIATION MECHANISMS: NON-THERMAL STARS: WINDS STARS: WOLF-RAYET X-RAYS: STARS |
topic |
ACCELERATION OF PARTICLES OUTFLOWS RADIATION MECHANISMS: NON-THERMAL STARS: WINDS STARS: WOLF-RAYET X-RAYS: STARS |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
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. Fil: del Palacio, Santiago. Chalmers University of Technology; Suecia 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 Fil: De Becker, M.. Université de Liège; Bélgica Fil: Altamirano, D.. University of Southampton; Reino Unido Fil: Bosch Ramon, Valentí. Universidad de Barcelona; España 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 Fil: Marcote, B.. Joint Institute For Vlbi Eric; Países Bajos 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 |
description |
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. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-04 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/218056 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 0004-6361 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/218056 |
identifier_str_mv |
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 0004-6361 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2023/04/aa45505-22/aa45505-22.html info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202245505 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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application/pdf application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
EDP Sciences |
publisher.none.fl_str_mv |
EDP Sciences |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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13.13397 |