Multiwavelength studies of WR 21a and its surroundings

Autores
Benaglia, Paula; Romero, Gustavo Esteban; Koribalski, Bärbel; Pollock, A. M. T.
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present results of high-resolution radio continuum observations towards the binary star WR 21a (Wack 2134) obtained with the Australia Telescope Compact Array (ATCA ) at 4.8 and 8.64 GHz. We detected the system at 4.8 GHz (6 cm) with a flux density of 0.25 ± 0.06 mJy and set an upper limit of 0.3 mJy at 8.64 GHz (3 cm). The derived spectral index of α < 0.3 (S ν ∝ να) suggests the presence of non-thermal emission, probably originating in a colliding-wind region. A second, unrelated radio source was detected ∼10 north of WR 21a at (RA, Dec)J2000 = (10h25m56s .49, −57◦48 34.4 ), with flux densities of 0.36 and 0.55 mJy at 4.8 and 8.64 GHz, respectively, resulting in α = 0.72. H  observations in the area are dominated by absorption against the prominent H  region RCW 49. Analysis of a complete set of archived X-ray observations of WR 21a confirms its strong variability but throws into doubt previous suggestions by Reig (1999) of a period of years for the system. Finally, we comment on the association with the nearby EGRET source 3EG J1027–5817.
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: 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
Fil: Koribalski, Bärbel. Australia Telescope National Facility; Australia
Fil: Pollock, A. M. T.. European Space Astronomy Centre; España
Materia
Wolf rayet stars
Radio continuum
HII regions
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:11336/29685
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Multiwavelength studies of WR 21a and its surroundingsBenaglia, PaulaRomero, Gustavo EstebanKoribalski, BärbelPollock, A. M. T.Wolf rayet starsRadio continuumHII regionshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present results of high-resolution radio continuum observations towards the binary star WR 21a (Wack 2134) obtained with the Australia Telescope Compact Array (ATCA ) at 4.8 and 8.64 GHz. We detected the system at 4.8 GHz (6 cm) with a flux density of 0.25 ± 0.06 mJy and set an upper limit of 0.3 mJy at 8.64 GHz (3 cm). The derived spectral index of α < 0.3 (S ν ∝ να) suggests the presence of non-thermal emission, probably originating in a colliding-wind region. A second, unrelated radio source was detected ∼10 north of WR 21a at (RA, Dec)J2000 = (10h25m56s .49, −57◦48 34.4 ), with flux densities of 0.36 and 0.55 mJy at 4.8 and 8.64 GHz, respectively, resulting in α = 0.72. H  observations in the area are dominated by absorption against the prominent H  region RCW 49. Analysis of a complete set of archived X-ray observations of WR 21a confirms its strong variability but throws into doubt previous suggestions by Reig (1999) of a period of years for the system. Finally, we comment on the association with the nearby EGRET source 3EG J1027–5817.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; ArgentinaFil: 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; ArgentinaFil: Koribalski, Bärbel. Australia Telescope National Facility; AustraliaFil: Pollock, A. M. T.. European Space Astronomy Centre; EspañaEDP Sciences2005-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/29685Benaglia, Paula; Romero, Gustavo Esteban; Koribalski, Bärbel; Pollock, A. M. T.; Multiwavelength studies of WR 21a and its surroundings; EDP Sciences; Astronomy and Astrophysics; 440; 12-2005; 743-7500004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20042617info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2005/35/aa2617-04/aa2617-04.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:51:31Zoai:ri.conicet.gov.ar:11336/29685instacron: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 09:51:31.971CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Multiwavelength studies of WR 21a and its surroundings
title Multiwavelength studies of WR 21a and its surroundings
spellingShingle Multiwavelength studies of WR 21a and its surroundings
Benaglia, Paula
Wolf rayet stars
Radio continuum
HII regions
title_short Multiwavelength studies of WR 21a and its surroundings
title_full Multiwavelength studies of WR 21a and its surroundings
title_fullStr Multiwavelength studies of WR 21a and its surroundings
title_full_unstemmed Multiwavelength studies of WR 21a and its surroundings
title_sort Multiwavelength studies of WR 21a and its surroundings
dc.creator.none.fl_str_mv Benaglia, Paula
Romero, Gustavo Esteban
Koribalski, Bärbel
Pollock, A. M. T.
author Benaglia, Paula
author_facet Benaglia, Paula
Romero, Gustavo Esteban
Koribalski, Bärbel
Pollock, A. M. T.
author_role author
author2 Romero, Gustavo Esteban
Koribalski, Bärbel
Pollock, A. M. T.
author2_role author
author
author
dc.subject.none.fl_str_mv Wolf rayet stars
Radio continuum
HII regions
topic Wolf rayet stars
Radio continuum
HII regions
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We present results of high-resolution radio continuum observations towards the binary star WR 21a (Wack 2134) obtained with the Australia Telescope Compact Array (ATCA ) at 4.8 and 8.64 GHz. We detected the system at 4.8 GHz (6 cm) with a flux density of 0.25 ± 0.06 mJy and set an upper limit of 0.3 mJy at 8.64 GHz (3 cm). The derived spectral index of α < 0.3 (S ν ∝ να) suggests the presence of non-thermal emission, probably originating in a colliding-wind region. A second, unrelated radio source was detected ∼10 north of WR 21a at (RA, Dec)J2000 = (10h25m56s .49, −57◦48 34.4 ), with flux densities of 0.36 and 0.55 mJy at 4.8 and 8.64 GHz, respectively, resulting in α = 0.72. H  observations in the area are dominated by absorption against the prominent H  region RCW 49. Analysis of a complete set of archived X-ray observations of WR 21a confirms its strong variability but throws into doubt previous suggestions by Reig (1999) of a period of years for the system. Finally, we comment on the association with the nearby EGRET source 3EG J1027–5817.
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: 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
Fil: Koribalski, Bärbel. Australia Telescope National Facility; Australia
Fil: Pollock, A. M. T.. European Space Astronomy Centre; España
description We present results of high-resolution radio continuum observations towards the binary star WR 21a (Wack 2134) obtained with the Australia Telescope Compact Array (ATCA ) at 4.8 and 8.64 GHz. We detected the system at 4.8 GHz (6 cm) with a flux density of 0.25 ± 0.06 mJy and set an upper limit of 0.3 mJy at 8.64 GHz (3 cm). The derived spectral index of α < 0.3 (S ν ∝ να) suggests the presence of non-thermal emission, probably originating in a colliding-wind region. A second, unrelated radio source was detected ∼10 north of WR 21a at (RA, Dec)J2000 = (10h25m56s .49, −57◦48 34.4 ), with flux densities of 0.36 and 0.55 mJy at 4.8 and 8.64 GHz, respectively, resulting in α = 0.72. H  observations in the area are dominated by absorption against the prominent H  region RCW 49. Analysis of a complete set of archived X-ray observations of WR 21a confirms its strong variability but throws into doubt previous suggestions by Reig (1999) of a period of years for the system. Finally, we comment on the association with the nearby EGRET source 3EG J1027–5817.
publishDate 2005
dc.date.none.fl_str_mv 2005-12
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/11336/29685
Benaglia, Paula; Romero, Gustavo Esteban; Koribalski, Bärbel; Pollock, A. M. T.; Multiwavelength studies of WR 21a and its surroundings; EDP Sciences; Astronomy and Astrophysics; 440; 12-2005; 743-750
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/29685
identifier_str_mv Benaglia, Paula; Romero, Gustavo Esteban; Koribalski, Bärbel; Pollock, A. M. T.; Multiwavelength studies of WR 21a and its surroundings; EDP Sciences; Astronomy and Astrophysics; 440; 12-2005; 743-750
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/doi/10.1051/0004-6361:20042617
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2005/35/aa2617-04/aa2617-04.html
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
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 13.070432

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