Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets

Autores
Owocki, S. P.; Romero, Gustavo Esteban; Townsend, R. H. D.; Araudo, Anabella Teresa
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In the subclass of high-mass X-ray binaries known as “microquasars”, relativistic hadrons in the jets launched by the compact object can interact with cold protons from the star’s radiatively driven wind, producing pions that then quickly decay into gamma rays. Since the resulting gamma-ray emissivity depends on the target density, the detection of rapid variability in microquasars with GLAST and the new generation of Cherenkov imaging arrays could be used to probe the clumped structure of the stellar wind. We show here that the fluctuation in gamma rays can be modeled using a “porosity length” formalism, usually applied to characterize clumping effects. In particular, for a porosity length defined by h ≡ ℓ/f, i.e. as the ratio of the characteristic size ℓ of clumps to their volume filling factor f, we find that the relative fluctuation in gamma-ray emission in a binary with orbital separation a scales as p h/πa in the “thin-jet” limit, and is reduced by a factor 1/ p 1 + φa/2ℓ for a jet with a finite opening angle φ. For a thin jet and quite moderate porosity length h ≈ 0.03 a, this implies a ca. 10% variation in the gamma-ray emission. Moreover, the illumination of individual large clumps might result in isolated flares, as has been recently observed in some massive gamma-ray binaries.
Fil: Owocki, S. P.. University of Delaware; Estados Unidos
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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Townsend, R. H. D.. University of Delaware; Estados Unidos
Fil: Araudo, Anabella Teresa. 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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Materia
Binary stars
Star winds
Gamma rays
Microquasars
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:11336/26720
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with JetsOwocki, S. P.Romero, Gustavo EstebanTownsend, R. H. D.Araudo, Anabella TeresaBinary starsStar windsGamma raysMicroquasarshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1In the subclass of high-mass X-ray binaries known as “microquasars”, relativistic hadrons in the jets launched by the compact object can interact with cold protons from the star’s radiatively driven wind, producing pions that then quickly decay into gamma rays. Since the resulting gamma-ray emissivity depends on the target density, the detection of rapid variability in microquasars with GLAST and the new generation of Cherenkov imaging arrays could be used to probe the clumped structure of the stellar wind. We show here that the fluctuation in gamma rays can be modeled using a “porosity length” formalism, usually applied to characterize clumping effects. In particular, for a porosity length defined by h ≡ ℓ/f, i.e. as the ratio of the characteristic size ℓ of clumps to their volume filling factor f, we find that the relative fluctuation in gamma-ray emission in a binary with orbital separation a scales as p h/πa in the “thin-jet” limit, and is reduced by a factor 1/ p 1 + φa/2ℓ for a jet with a finite opening angle φ. For a thin jet and quite moderate porosity length h ≈ 0.03 a, this implies a ca. 10% variation in the gamma-ray emission. Moreover, the illumination of individual large clumps might result in isolated flares, as has been recently observed in some massive gamma-ray binaries.Fil: Owocki, S. P.. University of Delaware; Estados UnidosFil: 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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Townsend, R. H. D.. University of Delaware; Estados UnidosFil: Araudo, Anabella Teresa. 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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaIOP Publishing2009-05info: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/11336/26720Owocki, S. P.; Romero, Gustavo Esteban; Townsend, R. H. D.; Araudo, Anabella Teresa; Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets; IOP Publishing; Astrophysical Journal; 696; 1; 5-2009; 690-6930004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2009arXiv0902.2278Oinfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/696/1/690/metainfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/696/1/690info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:03:40Zoai:ri.conicet.gov.ar:11336/26720instacron: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:34982025-10-15 15:03:40.496CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
title Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
spellingShingle Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
Owocki, S. P.
Binary stars
Star winds
Gamma rays
Microquasars
title_short Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
title_full Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
title_fullStr Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
title_full_unstemmed Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
title_sort Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets
dc.creator.none.fl_str_mv Owocki, S. P.
Romero, Gustavo Esteban
Townsend, R. H. D.
Araudo, Anabella Teresa
author Owocki, S. P.
author_facet Owocki, S. P.
Romero, Gustavo Esteban
Townsend, R. H. D.
Araudo, Anabella Teresa
author_role author
author2 Romero, Gustavo Esteban
Townsend, R. H. D.
Araudo, Anabella Teresa
author2_role author
author
author
dc.subject.none.fl_str_mv Binary stars
Star winds
Gamma rays
Microquasars
topic Binary stars
Star winds
Gamma rays
Microquasars
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In the subclass of high-mass X-ray binaries known as “microquasars”, relativistic hadrons in the jets launched by the compact object can interact with cold protons from the star’s radiatively driven wind, producing pions that then quickly decay into gamma rays. Since the resulting gamma-ray emissivity depends on the target density, the detection of rapid variability in microquasars with GLAST and the new generation of Cherenkov imaging arrays could be used to probe the clumped structure of the stellar wind. We show here that the fluctuation in gamma rays can be modeled using a “porosity length” formalism, usually applied to characterize clumping effects. In particular, for a porosity length defined by h ≡ ℓ/f, i.e. as the ratio of the characteristic size ℓ of clumps to their volume filling factor f, we find that the relative fluctuation in gamma-ray emission in a binary with orbital separation a scales as p h/πa in the “thin-jet” limit, and is reduced by a factor 1/ p 1 + φa/2ℓ for a jet with a finite opening angle φ. For a thin jet and quite moderate porosity length h ≈ 0.03 a, this implies a ca. 10% variation in the gamma-ray emission. Moreover, the illumination of individual large clumps might result in isolated flares, as has been recently observed in some massive gamma-ray binaries.
Fil: Owocki, S. P.. University of Delaware; Estados Unidos
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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Townsend, R. H. D.. University of Delaware; Estados Unidos
Fil: Araudo, Anabella Teresa. 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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
description In the subclass of high-mass X-ray binaries known as “microquasars”, relativistic hadrons in the jets launched by the compact object can interact with cold protons from the star’s radiatively driven wind, producing pions that then quickly decay into gamma rays. Since the resulting gamma-ray emissivity depends on the target density, the detection of rapid variability in microquasars with GLAST and the new generation of Cherenkov imaging arrays could be used to probe the clumped structure of the stellar wind. We show here that the fluctuation in gamma rays can be modeled using a “porosity length” formalism, usually applied to characterize clumping effects. In particular, for a porosity length defined by h ≡ ℓ/f, i.e. as the ratio of the characteristic size ℓ of clumps to their volume filling factor f, we find that the relative fluctuation in gamma-ray emission in a binary with orbital separation a scales as p h/πa in the “thin-jet” limit, and is reduced by a factor 1/ p 1 + φa/2ℓ for a jet with a finite opening angle φ. For a thin jet and quite moderate porosity length h ≈ 0.03 a, this implies a ca. 10% variation in the gamma-ray emission. Moreover, the illumination of individual large clumps might result in isolated flares, as has been recently observed in some massive gamma-ray binaries.
publishDate 2009
dc.date.none.fl_str_mv 2009-05
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/11336/26720
Owocki, S. P.; Romero, Gustavo Esteban; Townsend, R. H. D.; Araudo, Anabella Teresa; Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets; IOP Publishing; Astrophysical Journal; 696; 1; 5-2009; 690-693
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/26720
identifier_str_mv Owocki, S. P.; Romero, Gustavo Esteban; Townsend, R. H. D.; Araudo, Anabella Teresa; Gamma-Ray Variability from Wind Clumping in High-Mass X-Ray Binaries with Jets; IOP Publishing; Astrophysical Journal; 696; 1; 5-2009; 690-693
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2009arXiv0902.2278O
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/696/1/690/meta
info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/696/1/690
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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 12.891075

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