Radio detections towards unidentified variable EGRET sources

Autores
Paredes, Josep Maria; Marti, Josep; Ishwara Chandra, C. H.; Torres, Diego F.; Romero, Gustavo Esteban; Combi, Jorge Ariel; Bosch Ramon, Valentí; Muñoz Arjonilla, Álvaro José; Sánchez Sutil, Juan R.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. A considerable fraction of the gamma-ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly identified are either pulsars or variable sources at both radio and gamma-ray wavelengths. Most of the variable sources are strong radio blazars.However, some low galactic-latitude EGRET sources, with highly variable gamma-ray emission, lack any evident counterpart according to the radio data available until now. Aims. The primary goal of this paper is to identify and characterise the potential radio counterparts of four highly variable gamma-ray sources in the galactic plane through mapping the radio surroundings of the EGRET confidence contours and determining the variable radio sources in the field whenever possible. Methods. We have carried out a radio exploration of the fields of the selected EGRET sources using the Giant Metrewave Radio Telescope (GMRT) interferometer at 21 cm wavelength, with pointings being separated by months. Results. We detected a total of 151 radio sources. Among them, we identified a few radio sources whose flux density has apparently changed on timescales of months. Despite the limitations of our search, their possible variability makes these objects a top-priority target for multiwavelength studies of the potential counterparts of highly variable, unidentified gamma-ray sources.
Fil: Paredes, Josep Maria. Universidad de Barcelona; España
Fil: Marti, Josep. Universidad de Jaén; España
Fil: Ishwara Chandra, C. H.. National Centre for Radio Astrophysics; India
Fil: Torres, Diego F.. Universitat Autònoma de Barcelona; España
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: Combi, Jorge Ariel. Universidad de Jaén; España
Fil: Bosch Ramon, Valentí. Max Planck Institut f¨ur Kernphysik; Alemania
Fil: Muñoz Arjonilla, Álvaro José. Universidad de Jaén; España
Fil: Sánchez Sutil, Juan R.. Universidad de Jaén; España
Materia
Radio continuum
Gamma rays
X ray binaries
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:11336/29458
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Radio detections towards unidentified variable EGRET sourcesParedes, Josep MariaMarti, JosepIshwara Chandra, C. H.Torres, Diego F.Romero, Gustavo EstebanCombi, Jorge ArielBosch Ramon, ValentíMuñoz Arjonilla, Álvaro JoséSánchez Sutil, Juan R.Radio continuumGamma raysX ray binarieshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. A considerable fraction of the gamma-ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly identified are either pulsars or variable sources at both radio and gamma-ray wavelengths. Most of the variable sources are strong radio blazars.However, some low galactic-latitude EGRET sources, with highly variable gamma-ray emission, lack any evident counterpart according to the radio data available until now. Aims. The primary goal of this paper is to identify and characterise the potential radio counterparts of four highly variable gamma-ray sources in the galactic plane through mapping the radio surroundings of the EGRET confidence contours and determining the variable radio sources in the field whenever possible. Methods. We have carried out a radio exploration of the fields of the selected EGRET sources using the Giant Metrewave Radio Telescope (GMRT) interferometer at 21 cm wavelength, with pointings being separated by months. Results. We detected a total of 151 radio sources. Among them, we identified a few radio sources whose flux density has apparently changed on timescales of months. Despite the limitations of our search, their possible variability makes these objects a top-priority target for multiwavelength studies of the potential counterparts of highly variable, unidentified gamma-ray sources.Fil: Paredes, Josep Maria. Universidad de Barcelona; EspañaFil: Marti, Josep. Universidad de Jaén; EspañaFil: Ishwara Chandra, C. H.. National Centre for Radio Astrophysics; IndiaFil: Torres, Diego F.. Universitat Autònoma de Barcelona; EspañaFil: 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: Combi, Jorge Ariel. Universidad de Jaén; EspañaFil: Bosch Ramon, Valentí. Max Planck Institut f¨ur Kernphysik; AlemaniaFil: Muñoz Arjonilla, Álvaro José. Universidad de Jaén; EspañaFil: Sánchez Sutil, Juan R.. Universidad de Jaén; EspañaEDP Sciences2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/29458Paredes, Josep Maria; Marti, Josep; Ishwara Chandra, C. H.; Torres, Diego F.; Romero, Gustavo Esteban; et al.; Radio detections towards unidentified variable EGRET sources; EDP Sciences; Astronomy and Astrophysics; 482; 12-2008; 247-2530004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20078299info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2008/16/aa8299-07/aa8299-07.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 Técnicas2025-09-29T10:30:09Zoai:ri.conicet.gov.ar:11336/29458instacron: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 10:30:09.616CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Radio detections towards unidentified variable EGRET sources
title Radio detections towards unidentified variable EGRET sources
spellingShingle Radio detections towards unidentified variable EGRET sources
Paredes, Josep Maria
Radio continuum
Gamma rays
X ray binaries
title_short Radio detections towards unidentified variable EGRET sources
title_full Radio detections towards unidentified variable EGRET sources
title_fullStr Radio detections towards unidentified variable EGRET sources
title_full_unstemmed Radio detections towards unidentified variable EGRET sources
title_sort Radio detections towards unidentified variable EGRET sources
dc.creator.none.fl_str_mv Paredes, Josep Maria
Marti, Josep
Ishwara Chandra, C. H.
Torres, Diego F.
Romero, Gustavo Esteban
Combi, Jorge Ariel
Bosch Ramon, Valentí
Muñoz Arjonilla, Álvaro José
Sánchez Sutil, Juan R.
author Paredes, Josep Maria
author_facet Paredes, Josep Maria
Marti, Josep
Ishwara Chandra, C. H.
Torres, Diego F.
Romero, Gustavo Esteban
Combi, Jorge Ariel
Bosch Ramon, Valentí
Muñoz Arjonilla, Álvaro José
Sánchez Sutil, Juan R.
author_role author
author2 Marti, Josep
Ishwara Chandra, C. H.
Torres, Diego F.
Romero, Gustavo Esteban
Combi, Jorge Ariel
Bosch Ramon, Valentí
Muñoz Arjonilla, Álvaro José
Sánchez Sutil, Juan R.
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Radio continuum
Gamma rays
X ray binaries
topic Radio continuum
Gamma rays
X ray binaries
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. A considerable fraction of the gamma-ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly identified are either pulsars or variable sources at both radio and gamma-ray wavelengths. Most of the variable sources are strong radio blazars.However, some low galactic-latitude EGRET sources, with highly variable gamma-ray emission, lack any evident counterpart according to the radio data available until now. Aims. The primary goal of this paper is to identify and characterise the potential radio counterparts of four highly variable gamma-ray sources in the galactic plane through mapping the radio surroundings of the EGRET confidence contours and determining the variable radio sources in the field whenever possible. Methods. We have carried out a radio exploration of the fields of the selected EGRET sources using the Giant Metrewave Radio Telescope (GMRT) interferometer at 21 cm wavelength, with pointings being separated by months. Results. We detected a total of 151 radio sources. Among them, we identified a few radio sources whose flux density has apparently changed on timescales of months. Despite the limitations of our search, their possible variability makes these objects a top-priority target for multiwavelength studies of the potential counterparts of highly variable, unidentified gamma-ray sources.
Fil: Paredes, Josep Maria. Universidad de Barcelona; España
Fil: Marti, Josep. Universidad de Jaén; España
Fil: Ishwara Chandra, C. H.. National Centre for Radio Astrophysics; India
Fil: Torres, Diego F.. Universitat Autònoma de Barcelona; España
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: Combi, Jorge Ariel. Universidad de Jaén; España
Fil: Bosch Ramon, Valentí. Max Planck Institut f¨ur Kernphysik; Alemania
Fil: Muñoz Arjonilla, Álvaro José. Universidad de Jaén; España
Fil: Sánchez Sutil, Juan R.. Universidad de Jaén; España
description Context. A considerable fraction of the gamma-ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly identified are either pulsars or variable sources at both radio and gamma-ray wavelengths. Most of the variable sources are strong radio blazars.However, some low galactic-latitude EGRET sources, with highly variable gamma-ray emission, lack any evident counterpart according to the radio data available until now. Aims. The primary goal of this paper is to identify and characterise the potential radio counterparts of four highly variable gamma-ray sources in the galactic plane through mapping the radio surroundings of the EGRET confidence contours and determining the variable radio sources in the field whenever possible. Methods. We have carried out a radio exploration of the fields of the selected EGRET sources using the Giant Metrewave Radio Telescope (GMRT) interferometer at 21 cm wavelength, with pointings being separated by months. Results. We detected a total of 151 radio sources. Among them, we identified a few radio sources whose flux density has apparently changed on timescales of months. Despite the limitations of our search, their possible variability makes these objects a top-priority target for multiwavelength studies of the potential counterparts of highly variable, unidentified gamma-ray sources.
publishDate 2008
dc.date.none.fl_str_mv 2008-12
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/11336/29458
Paredes, Josep Maria; Marti, Josep; Ishwara Chandra, C. H.; Torres, Diego F.; Romero, Gustavo Esteban; et al.; Radio detections towards unidentified variable EGRET sources; EDP Sciences; Astronomy and Astrophysics; 482; 12-2008; 247-253
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/29458
identifier_str_mv Paredes, Josep Maria; Marti, Josep; Ishwara Chandra, C. H.; Torres, Diego F.; Romero, Gustavo Esteban; et al.; Radio detections towards unidentified variable EGRET sources; EDP Sciences; Astronomy and Astrophysics; 482; 12-2008; 247-253
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/10.1051/0004-6361:20078299
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2008/16/aa8299-07/aa8299-07.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
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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