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
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/218056
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/218056
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling 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 Técnicas2025-09-29T10:37:16Zoai: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:34982025-09-29 10:37:16.295CONICET 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/
dc.format.none.fl_str_mv 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)
collection CONICET Digital (CONICET)
instname_str 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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score 13.069144

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