Detection of nonthermal emission from the bow shock of a massive runaway star

Context. The environs of massive, early-type stars have been inspected in recent years in the search for sites where particles can be accelerated up to relativistic energies. Wind regions of massive binaries that collide have already been established as sources of high-energy emission; however, ther...

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Detalles Bibliográficos
Autores: Benaglia, Paula, Romero, Gustavo Esteban, Martí, J., Peri, Cintia Soledad, Araudo, Anabella Teresa
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2010
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/82448
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82448
Access Level:acceso abierto
Palabra clave:Ciencias Astronómicas
Infrared: stars
Radio continuum: general
Stars: early-type
Stars: individual: BD+43°3654
Infrared: star
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spelling Detection of nonthermal emission from the bow shock of a massive runaway starBenaglia, PaulaRomero, Gustavo EstebanMartí, J.Peri, Cintia SoledadAraudo, Anabella TeresaCiencias AstronómicasInfrared: starsRadio continuum: generalStars: early-typeStars: individual: BD+43°3654Infrared: starStars: early-typeContext. The environs of massive, early-type stars have been inspected in recent years in the search for sites where particles can be accelerated up to relativistic energies. Wind regions of massive binaries that collide have already been established as sources of high-energy emission; however, there is a different scenario for massive stars where strong shocks can also be produced: the bow-shaped region of matter piled up by the action of the stellar strong wind of a runaway star interacting with the interstellar medium. Aims. We study the bow-shock region produced by a very massive runaway star, BD+43°3654, to look for nonthermal radio emission as evidence of a relativistic particle population. Methods. We observed the field of BD+43°3654 at two frequencies, 1.42 and 4.86 GHz, with the Very Large Array (VLA), and obtained a spectral index map of the radio emission. Results. We have detected, for the first time, nonthermal radio emission from the bow shock of a massive runaway star. Conclusions. After analyzing the radiative mechanisms that can be at work, we conclude that the region under study could produce enough relativistic particles whose radiation might be detectable by forthcoming gamma-ray instruments, like CTA North.Facultad de Ciencias Astronómicas y Geofísicas2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/82448enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201015232info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2024-05-08T12:53:31Zoai:sedici.unlp.edu.ar:10915/82448Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292024-05-08 12:53:31.906SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Detection of nonthermal emission from the bow shock of a massive runaway star
title Detection of nonthermal emission from the bow shock of a massive runaway star
spellingShingle Detection of nonthermal emission from the bow shock of a massive runaway star
Benaglia, Paula
Ciencias Astronómicas
Infrared: stars
Radio continuum: general
Stars: early-type
Stars: individual: BD+43°3654
Infrared: star
Stars: early-type
title_short Detection of nonthermal emission from the bow shock of a massive runaway star
title_full Detection of nonthermal emission from the bow shock of a massive runaway star
title_fullStr Detection of nonthermal emission from the bow shock of a massive runaway star
title_full_unstemmed Detection of nonthermal emission from the bow shock of a massive runaway star
title_sort Detection of nonthermal emission from the bow shock of a massive runaway star
dc.creator.none.fl_str_mv Benaglia, Paula
Romero, Gustavo Esteban
Martí, J.
Peri, Cintia Soledad
Araudo, Anabella Teresa
author Benaglia, Paula
author_facet Benaglia, Paula
Romero, Gustavo Esteban
Martí, J.
Peri, Cintia Soledad
Araudo, Anabella Teresa
author_role author
author2 Romero, Gustavo Esteban
Martí, J.
Peri, Cintia Soledad
Araudo, Anabella Teresa
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Infrared: stars
Radio continuum: general
Stars: early-type
Stars: individual: BD+43°3654
Infrared: star
Stars: early-type
topic Ciencias Astronómicas
Infrared: stars
Radio continuum: general
Stars: early-type
Stars: individual: BD+43°3654
Infrared: star
Stars: early-type
description Context. The environs of massive, early-type stars have been inspected in recent years in the search for sites where particles can be accelerated up to relativistic energies. Wind regions of massive binaries that collide have already been established as sources of high-energy emission; however, there is a different scenario for massive stars where strong shocks can also be produced: the bow-shaped region of matter piled up by the action of the stellar strong wind of a runaway star interacting with the interstellar medium. Aims. We study the bow-shock region produced by a very massive runaway star, BD+43°3654, to look for nonthermal radio emission as evidence of a relativistic particle population. Methods. We observed the field of BD+43°3654 at two frequencies, 1.42 and 4.86 GHz, with the Very Large Array (VLA), and obtained a spectral index map of the radio emission. Results. We have detected, for the first time, nonthermal radio emission from the bow shock of a massive runaway star. Conclusions. After analyzing the radiative mechanisms that can be at work, we conclude that the region under study could produce enough relativistic particles whose radiation might be detectable by forthcoming gamma-ray instruments, like CTA North.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/82448
url http://sedici.unlp.edu.ar/handle/10915/82448
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201015232
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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