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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/30880
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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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1846082819921543168 |
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13.22299 |