Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes

Autores
Torres, Diego F.; Romero, Gustavo Esteban; Eiroa, Ernesto Fabian
Año de publicación
2002
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We propose that some of the high-latitude unidentified EGRET -ray sources could be the result of gravitational lensing amplification of the innermost regions of distant, faint, active galactic nuclei. These objects have -ray–emitting regions small enough to be affected by microlensing of stars in interposed galaxies. We compute the gravitational amplification, taking into account effects of the host galaxy of the lens, and prove that, whereas the innermost -ray regions can be magnified up to a thousand times, there is no amplification at radio frequencies, which leads to the observed absence of strong counterparts. Some new effects in the spectral evolution of a gravitational microlensed -ray active galactic nuclei are predicted. Within a reasonable range of lensing parameters and/or types of sources, both variable and nonvariable EGRET detections at high latitudes can be explained by microlensing. The same phenomenon could also have an important incidence among the future GLAST detections at high latitudes.
Fil: Torres, Diego F.. University of Princeton; 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
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
Materia
Active galaxies
Gamma ray observations
Gravitational lensing
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:11336/30876
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudesTorres, Diego F.Romero, Gustavo EstebanEiroa, Ernesto FabianActive galaxiesGamma ray observationsGravitational lensinghttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We propose that some of the high-latitude unidentified EGRET -ray sources could be the result of gravitational lensing amplification of the innermost regions of distant, faint, active galactic nuclei. These objects have -ray–emitting regions small enough to be affected by microlensing of stars in interposed galaxies. We compute the gravitational amplification, taking into account effects of the host galaxy of the lens, and prove that, whereas the innermost -ray regions can be magnified up to a thousand times, there is no amplification at radio frequencies, which leads to the observed absence of strong counterparts. Some new effects in the spectral evolution of a gravitational microlensed -ray active galactic nuclei are predicted. Within a reasonable range of lensing parameters and/or types of sources, both variable and nonvariable EGRET detections at high latitudes can be explained by microlensing. The same phenomenon could also have an important incidence among the future GLAST detections at high latitudes.Fil: Torres, Diego F.. University of Princeton; 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; 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; ArgentinaIOP Publishing2002-12info: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/11336/30876Eiroa, Ernesto Fabian; Romero, Gustavo Esteban; Torres, Diego F.; Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes; IOP Publishing; Astrophysical Journal; 569; 12-2002; 600-6040004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1086/339348info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1086/339348/metainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:04:45Zoai:ri.conicet.gov.ar:11336/30876instacron: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:34982025-09-03 10:04:45.65CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
title Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
spellingShingle Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
Torres, Diego F.
Active galaxies
Gamma ray observations
Gravitational lensing
title_short Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
title_full Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
title_fullStr Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
title_full_unstemmed Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
title_sort Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
dc.creator.none.fl_str_mv Torres, Diego F.
Romero, Gustavo Esteban
Eiroa, Ernesto Fabian
author Torres, Diego F.
author_facet Torres, Diego F.
Romero, Gustavo Esteban
Eiroa, Ernesto Fabian
author_role author
author2 Romero, Gustavo Esteban
Eiroa, Ernesto Fabian
author2_role author
author
dc.subject.none.fl_str_mv Active galaxies
Gamma ray observations
Gravitational lensing
topic Active galaxies
Gamma ray observations
Gravitational lensing
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 propose that some of the high-latitude unidentified EGRET -ray sources could be the result of gravitational lensing amplification of the innermost regions of distant, faint, active galactic nuclei. These objects have -ray–emitting regions small enough to be affected by microlensing of stars in interposed galaxies. We compute the gravitational amplification, taking into account effects of the host galaxy of the lens, and prove that, whereas the innermost -ray regions can be magnified up to a thousand times, there is no amplification at radio frequencies, which leads to the observed absence of strong counterparts. Some new effects in the spectral evolution of a gravitational microlensed -ray active galactic nuclei are predicted. Within a reasonable range of lensing parameters and/or types of sources, both variable and nonvariable EGRET detections at high latitudes can be explained by microlensing. The same phenomenon could also have an important incidence among the future GLAST detections at high latitudes.
Fil: Torres, Diego F.. University of Princeton; 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
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
description We propose that some of the high-latitude unidentified EGRET -ray sources could be the result of gravitational lensing amplification of the innermost regions of distant, faint, active galactic nuclei. These objects have -ray–emitting regions small enough to be affected by microlensing of stars in interposed galaxies. We compute the gravitational amplification, taking into account effects of the host galaxy of the lens, and prove that, whereas the innermost -ray regions can be magnified up to a thousand times, there is no amplification at radio frequencies, which leads to the observed absence of strong counterparts. Some new effects in the spectral evolution of a gravitational microlensed -ray active galactic nuclei are predicted. Within a reasonable range of lensing parameters and/or types of sources, both variable and nonvariable EGRET detections at high latitudes can be explained by microlensing. The same phenomenon could also have an important incidence among the future GLAST detections at high latitudes.
publishDate 2002
dc.date.none.fl_str_mv 2002-12
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/11336/30876
Eiroa, Ernesto Fabian; Romero, Gustavo Esteban; Torres, Diego F.; Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes; IOP Publishing; Astrophysical Journal; 569; 12-2002; 600-604
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/30876
identifier_str_mv Eiroa, Ernesto Fabian; Romero, Gustavo Esteban; Torres, Diego F.; Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes; IOP Publishing; Astrophysical Journal; 569; 12-2002; 600-604
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/doi/10.1086/339348
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1086/339348/meta
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 13.13397

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