Extreme intranight variability in the BL Lacertae object AO 0235+164

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 present results of two-colour photometry with high time resolution of the violently variable BL Lac object AO 0235+164. We have found extreme intranight variability with amplitudes of ~ 100% over time scales of 24 hours. Changes of 0.5 magnitudes in both R and V bands were measured within a single night, and variations up to 1.2 magnitudes occurred from night to night. A complete outburst with an amplitude ~ 30% was observed during one of the nights, while the spectrum remained unchanged. This seems to support an origin based on a thin relativistic shock propagating in such a way that it changes the viewing angle, as recently suggested by Kraus et al. (1999) and Qian et al. (2000).
Instituto Argentino de Radioastronomía
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Galaxies: BL Lacertae objects: individual: AO 0235+164
Galaxies: photometry
Radiation mechanisms: nonthermal
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:10915/101378
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/101378
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Extreme intranight variability in the BL Lacertae object AO 0235+164Romero, Gustavo EstebanCellone, Sergio AldoCombi, Jorge ArielCiencias AstronómicasGalaxies: BL Lacertae objects: individual: AO 0235+164Galaxies: photometryRadiation mechanisms: nonthermalWe present results of two-colour photometry with high time resolution of the violently variable BL Lac object AO 0235+164. We have found extreme intranight variability with amplitudes of ~ 100% over time scales of 24 hours. Changes of 0.5 magnitudes in both R and V bands were measured within a single night, and variations up to 1.2 magnitudes occurred from night to night. A complete outburst with an amplitude ~ 30% was observed during one of the nights, while the spectrum remained unchanged. This seems to support an origin based on a thin relativistic shock propagating in such a way that it changes the viewing angle, as recently suggested by Kraus et al. (1999) and Qian et al. (2000).Instituto Argentino de RadioastronomíaFacultad de Ciencias Astronómicas y Geofísicas2000-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf47-50http://sedici.unlp.edu.ar/handle/10915/101378enginfo:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/11336/32312info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2000A%26A...360L..47Rinfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/arxiv/astro-ph/0007407info:eu-repo/semantics/altIdentifier/hdl/11336/32312info: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:UNLP2025-09-29T11:20:01Zoai:sedici.unlp.edu.ar:10915/101378Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:20:01.969SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Extreme intranight variability in the BL Lacertae object AO 0235+164
title Extreme intranight variability in the BL Lacertae object AO 0235+164
spellingShingle Extreme intranight variability in the BL Lacertae object AO 0235+164
Romero, Gustavo Esteban
Ciencias Astronómicas
Galaxies: BL Lacertae objects: individual: AO 0235+164
Galaxies: photometry
Radiation mechanisms: nonthermal
title_short Extreme intranight variability in the BL Lacertae object AO 0235+164
title_full Extreme intranight variability in the BL Lacertae object AO 0235+164
title_fullStr Extreme intranight variability in the BL Lacertae object AO 0235+164
title_full_unstemmed Extreme intranight variability in the BL Lacertae object AO 0235+164
title_sort Extreme intranight variability in the BL Lacertae object AO 0235+164
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
Galaxies: BL Lacertae objects: individual: AO 0235+164
Galaxies: photometry
Radiation mechanisms: nonthermal
topic Ciencias Astronómicas
Galaxies: BL Lacertae objects: individual: AO 0235+164
Galaxies: photometry
Radiation mechanisms: nonthermal
dc.description.none.fl_txt_mv We present results of two-colour photometry with high time resolution of the violently variable BL Lac object AO 0235+164. We have found extreme intranight variability with amplitudes of ~ 100% over time scales of 24 hours. Changes of 0.5 magnitudes in both R and V bands were measured within a single night, and variations up to 1.2 magnitudes occurred from night to night. A complete outburst with an amplitude ~ 30% was observed during one of the nights, while the spectrum remained unchanged. This seems to support an origin based on a thin relativistic shock propagating in such a way that it changes the viewing angle, as recently suggested by Kraus et al. (1999) and Qian et al. (2000).
Instituto Argentino de Radioastronomía
Facultad de Ciencias Astronómicas y Geofísicas
description We present results of two-colour photometry with high time resolution of the violently variable BL Lac object AO 0235+164. We have found extreme intranight variability with amplitudes of ~ 100% over time scales of 24 hours. Changes of 0.5 magnitudes in both R and V bands were measured within a single night, and variations up to 1.2 magnitudes occurred from night to night. A complete outburst with an amplitude ~ 30% was observed during one of the nights, while the spectrum remained unchanged. This seems to support an origin based on a thin relativistic shock propagating in such a way that it changes the viewing angle, as recently suggested by Kraus et al. (1999) and Qian et al. (2000).
publishDate 2000
dc.date.none.fl_str_mv 2000-12
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/10915/101378
url http://sedici.unlp.edu.ar/handle/10915/101378
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/11336/32312
info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2000A%26A...360L..47R
info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/arxiv/astro-ph/0007407
info:eu-repo/semantics/altIdentifier/hdl/11336/32312
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
47-50
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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