Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441

Autores
Romero, Gustavo Esteban; Cellone, Sergio Aldo; Combi, Jorge Ariel
Año de publicación
2000
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report the results of a microvariability monitoring campaign on the southern blazar PKS 0537-441. The source was observed in the V and R optical bands throughout six consecutive nights. Strong variations at both bands, with amplitudes of ∼0.3 mag, were observed on timescales of about 2 days. Smaller fluctuations of ∼0.05 mag on a scale of a couple of hours are superposed on the larger outburst. The spectral index was also variable during the observing period, with an average value of α = -1.6 and changes up to ∼27.5%. The spectrum varies in the sense that it becomes harder when the source is brighter, in accordance with predictions of shock-in-jet models. We discuss our results and the possible origin of the variability in this blazar in light of recent higher frequency observations.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto Argentino de Radioastronomía
Materia
Ciencias Astronómicas
BL lacertae objects: individual (PKS 0537-441)
Galaxies: active
Galaxies: photometry
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84260
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/84260
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441Romero, Gustavo EstebanCellone, Sergio AldoCombi, Jorge ArielCiencias AstronómicasBL lacertae objects: individual (PKS 0537-441)Galaxies: activeGalaxies: photometryWe report the results of a microvariability monitoring campaign on the southern blazar PKS 0537-441. The source was observed in the V and R optical bands throughout six consecutive nights. Strong variations at both bands, with amplitudes of ∼0.3 mag, were observed on timescales of about 2 days. Smaller fluctuations of ∼0.05 mag on a scale of a couple of hours are superposed on the larger outburst. The spectral index was also variable during the observing period, with an average value of α = -1.6 and changes up to ∼27.5%. The spectrum varies in the sense that it becomes harder when the source is brighter, in accordance with predictions of shock-in-jet models. We discuss our results and the possible origin of the variability in this blazar in light of recent higher frequency observations.Facultad de Ciencias Astronómicas y GeofísicasInstituto Argentino de Radioastronomía2000info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1192-1197http://sedici.unlp.edu.ar/handle/10915/84260enginfo:eu-repo/semantics/altIdentifier/issn/0004-6256info:eu-repo/semantics/altIdentifier/doi/10.1086/301526info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:19Zoai:sedici.unlp.edu.ar:10915/84260Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:20.206SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
title Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
spellingShingle Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
Romero, Gustavo Esteban
Ciencias Astronómicas
BL lacertae objects: individual (PKS 0537-441)
Galaxies: active
Galaxies: photometry
title_short Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
title_full Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
title_fullStr Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
title_full_unstemmed Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
title_sort Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
dc.creator.none.fl_str_mv Romero, Gustavo Esteban
Cellone, Sergio Aldo
Combi, Jorge Ariel
author Romero, Gustavo Esteban
author_facet Romero, Gustavo Esteban
Cellone, Sergio Aldo
Combi, Jorge Ariel
author_role author
author2 Cellone, Sergio Aldo
Combi, Jorge Ariel
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
BL lacertae objects: individual (PKS 0537-441)
Galaxies: active
Galaxies: photometry
topic Ciencias Astronómicas
BL lacertae objects: individual (PKS 0537-441)
Galaxies: active
Galaxies: photometry
dc.description.none.fl_txt_mv We report the results of a microvariability monitoring campaign on the southern blazar PKS 0537-441. The source was observed in the V and R optical bands throughout six consecutive nights. Strong variations at both bands, with amplitudes of ∼0.3 mag, were observed on timescales of about 2 days. Smaller fluctuations of ∼0.05 mag on a scale of a couple of hours are superposed on the larger outburst. The spectral index was also variable during the observing period, with an average value of α = -1.6 and changes up to ∼27.5%. The spectrum varies in the sense that it becomes harder when the source is brighter, in accordance with predictions of shock-in-jet models. We discuss our results and the possible origin of the variability in this blazar in light of recent higher frequency observations.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto Argentino de Radioastronomía
description We report the results of a microvariability monitoring campaign on the southern blazar PKS 0537-441. The source was observed in the V and R optical bands throughout six consecutive nights. Strong variations at both bands, with amplitudes of ∼0.3 mag, were observed on timescales of about 2 days. Smaller fluctuations of ∼0.05 mag on a scale of a couple of hours are superposed on the larger outburst. The spectral index was also variable during the observing period, with an average value of α = -1.6 and changes up to ∼27.5%. The spectrum varies in the sense that it becomes harder when the source is brighter, in accordance with predictions of shock-in-jet models. We discuss our results and the possible origin of the variability in this blazar in light of recent higher frequency observations.
publishDate 2000
dc.date.none.fl_str_mv 2000
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/84260
url http://sedici.unlp.edu.ar/handle/10915/84260
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6256
info:eu-repo/semantics/altIdentifier/doi/10.1086/301526
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
1192-1197
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.070432

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