Gravitational microlensing of gamma-ray blazars

Autores
Torres, Diego F.; Romero, Gustavo Esteban; Eiroa, Ernesto Fabian; Wambsganss, Joachim; Pessah, Martin E.
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present a detailed study of the effects of gravitational microlensing on compact and distant γ -ray blazars. These objects have γ -ray-emitting regions that are small enough to be affected by microlensing effects produced by stars lying in intermediate galaxies. We compute the gravitational magnification taking into account effects of the lensing and show that, whereas the innermost γ -ray spheres can be significantly magnified, there is little magnification either for very high γ -ray energies or for lower (radio) frequencies (because these wavelengths are emitted from larger regions). We analyse the temporal evolution of the gamma-ray magnification for sources moving in a caustic pattern field, where the combined effects of thousands of stars are taken into account using a numerical technique. We propose that some of the unidentified γ -ray sources (particularly some of those lying at high galactic latitude with gamma-ray statistical properties that are very similar to detected γ -ray blazars) are indeed the result of gravitational lensing magnification of background undetected active galactic nuclei (AGN). This is partly supported from a statistical point of view: we show herein as well, using the latest information from the third EGRET catalogue, that high-latitude γ -ray sources have similar averaged properties to already detected γ -ray AGN. Some differences between both samples, regarding the mean flux level, could also be understood within the lensing model. With an adequate selection of lensing parameters, it is possible to explain a variety of γ -ray light curves with different time-scales, including non-variable sources. The absence of strong radio counterparts could be naturally explained by differential magnification in the extended source formalism.
Fil: Torres, Diego F.. Lawrence Livermore National Laboratory;
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: Eiroa, Ernesto Fabian. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Wambsganss, Joachim. Universitat Potsdam; Alemania
Fil: Pessah, Martin E.. University of Arizona; Estados Unidos
Materia
Gravitational lensing
Active galaxies
Gamma ray observations
Gamma ray theory
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:11336/30880

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spelling Gravitational microlensing of gamma-ray blazarsTorres, Diego F.Romero, Gustavo EstebanEiroa, Ernesto FabianWambsganss, JoachimPessah, Martin E.Gravitational lensingActive galaxiesGamma ray observationsGamma ray theoryhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present a detailed study of the effects of gravitational microlensing on compact and distant γ -ray blazars. These objects have γ -ray-emitting regions that are small enough to be affected by microlensing effects produced by stars lying in intermediate galaxies. We compute the gravitational magnification taking into account effects of the lensing and show that, whereas the innermost γ -ray spheres can be significantly magnified, there is little magnification either for very high γ -ray energies or for lower (radio) frequencies (because these wavelengths are emitted from larger regions). We analyse the temporal evolution of the gamma-ray magnification for sources moving in a caustic pattern field, where the combined effects of thousands of stars are taken into account using a numerical technique. We propose that some of the unidentified γ -ray sources (particularly some of those lying at high galactic latitude with gamma-ray statistical properties that are very similar to detected γ -ray blazars) are indeed the result of gravitational lensing magnification of background undetected active galactic nuclei (AGN). This is partly supported from a statistical point of view: we show herein as well, using the latest information from the third EGRET catalogue, that high-latitude γ -ray sources have similar averaged properties to already detected γ -ray AGN. Some differences between both samples, regarding the mean flux level, could also be understood within the lensing model. With an adequate selection of lensing parameters, it is possible to explain a variety of γ -ray light curves with different time-scales, including non-variable sources. The absence of strong radio counterparts could be naturally explained by differential magnification in the extended source formalism.Fil: Torres, Diego F.. Lawrence Livermore National Laboratory;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; ArgentinaFil: Eiroa, Ernesto Fabian. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Wambsganss, Joachim. Universitat Potsdam; AlemaniaFil: Pessah, Martin E.. University of Arizona; Estados UnidosWiley Blackwell Publishing, Inc2003-12info: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/11336/30880Pessah, Martin E.; Wambsganss, Joachim; Eiroa, Ernesto Fabian; Romero, Gustavo Esteban; Torres, Diego F.; Gravitational microlensing of gamma-ray blazars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 339; 12-2003; 335-3520035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-8711.2003.06219.xinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/339/2/335/1004147info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:35:48Zoai:ri.conicet.gov.ar:11336/30880instacron: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 14:35:49.03CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Gravitational microlensing of gamma-ray blazars
title Gravitational microlensing of gamma-ray blazars
spellingShingle Gravitational microlensing of gamma-ray blazars
Torres, Diego F.
Gravitational lensing
Active galaxies
Gamma ray observations
Gamma ray theory
title_short Gravitational microlensing of gamma-ray blazars
title_full Gravitational microlensing of gamma-ray blazars
title_fullStr Gravitational microlensing of gamma-ray blazars
title_full_unstemmed Gravitational microlensing of gamma-ray blazars
title_sort Gravitational microlensing of gamma-ray blazars
dc.creator.none.fl_str_mv Torres, Diego F.
Romero, Gustavo Esteban
Eiroa, Ernesto Fabian
Wambsganss, Joachim
Pessah, Martin E.
author Torres, Diego F.
author_facet Torres, Diego F.
Romero, Gustavo Esteban
Eiroa, Ernesto Fabian
Wambsganss, Joachim
Pessah, Martin E.
author_role author
author2 Romero, Gustavo Esteban
Eiroa, Ernesto Fabian
Wambsganss, Joachim
Pessah, Martin E.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Gravitational lensing
Active galaxies
Gamma ray observations
Gamma ray theory
topic Gravitational lensing
Active galaxies
Gamma ray observations
Gamma ray theory
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 a detailed study of the effects of gravitational microlensing on compact and distant γ -ray blazars. These objects have γ -ray-emitting regions that are small enough to be affected by microlensing effects produced by stars lying in intermediate galaxies. We compute the gravitational magnification taking into account effects of the lensing and show that, whereas the innermost γ -ray spheres can be significantly magnified, there is little magnification either for very high γ -ray energies or for lower (radio) frequencies (because these wavelengths are emitted from larger regions). We analyse the temporal evolution of the gamma-ray magnification for sources moving in a caustic pattern field, where the combined effects of thousands of stars are taken into account using a numerical technique. We propose that some of the unidentified γ -ray sources (particularly some of those lying at high galactic latitude with gamma-ray statistical properties that are very similar to detected γ -ray blazars) are indeed the result of gravitational lensing magnification of background undetected active galactic nuclei (AGN). This is partly supported from a statistical point of view: we show herein as well, using the latest information from the third EGRET catalogue, that high-latitude γ -ray sources have similar averaged properties to already detected γ -ray AGN. Some differences between both samples, regarding the mean flux level, could also be understood within the lensing model. With an adequate selection of lensing parameters, it is possible to explain a variety of γ -ray light curves with different time-scales, including non-variable sources. The absence of strong radio counterparts could be naturally explained by differential magnification in the extended source formalism.
Fil: Torres, Diego F.. Lawrence Livermore National Laboratory;
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: Eiroa, Ernesto Fabian. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Wambsganss, Joachim. Universitat Potsdam; Alemania
Fil: Pessah, Martin E.. University of Arizona; Estados Unidos
description We present a detailed study of the effects of gravitational microlensing on compact and distant γ -ray blazars. These objects have γ -ray-emitting regions that are small enough to be affected by microlensing effects produced by stars lying in intermediate galaxies. We compute the gravitational magnification taking into account effects of the lensing and show that, whereas the innermost γ -ray spheres can be significantly magnified, there is little magnification either for very high γ -ray energies or for lower (radio) frequencies (because these wavelengths are emitted from larger regions). We analyse the temporal evolution of the gamma-ray magnification for sources moving in a caustic pattern field, where the combined effects of thousands of stars are taken into account using a numerical technique. We propose that some of the unidentified γ -ray sources (particularly some of those lying at high galactic latitude with gamma-ray statistical properties that are very similar to detected γ -ray blazars) are indeed the result of gravitational lensing magnification of background undetected active galactic nuclei (AGN). This is partly supported from a statistical point of view: we show herein as well, using the latest information from the third EGRET catalogue, that high-latitude γ -ray sources have similar averaged properties to already detected γ -ray AGN. Some differences between both samples, regarding the mean flux level, could also be understood within the lensing model. With an adequate selection of lensing parameters, it is possible to explain a variety of γ -ray light curves with different time-scales, including non-variable sources. The absence of strong radio counterparts could be naturally explained by differential magnification in the extended source formalism.
publishDate 2003
dc.date.none.fl_str_mv 2003-12
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/11336/30880
Pessah, Martin E.; Wambsganss, Joachim; Eiroa, Ernesto Fabian; Romero, Gustavo Esteban; Torres, Diego F.; Gravitational microlensing of gamma-ray blazars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 339; 12-2003; 335-352
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/30880
identifier_str_mv Pessah, Martin E.; Wambsganss, Joachim; Eiroa, Ernesto Fabian; Romero, Gustavo Esteban; Torres, Diego F.; Gravitational microlensing of gamma-ray blazars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 339; 12-2003; 335-352
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-8711.2003.06219.x
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/339/2/335/1004147
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 Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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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