Rapid variability in the southern blazar PKS 0521-365

Autores
Romero, Gustavo Esteban; Combi, Jorge Ariel; Vucetich, Héctor
Año de publicación
1995
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present an intrinsic interpretation for the recently reported radio variability in the southern blazar PKS 0521-365. A shockedjet model can account for the quasi-periodical variations in the flux density of the source by means of inhomogeneities in the electron density with a quasi-periodic distribution along a jet in which a relativistic strong shock is propagating. These inhomogeneities are naturally produced by the effects of Kelvin-Helmholtz instabilities in the hypersonic parsec scale jet. The quasi-linear evolution of the polarization position angle can be understood as an effect of the “illumination” of successive cross sections with different mean field orientation or as a consequence of the shock propagation through a turbulent region in the jet. The high brightness temperature problem introduced by the short timescale varibility is solved invocating relativistic boosting with a moderately small viewing angle in agreement with the known structure of the source. In this context, several parameters are estimated.
Instituto Argentino de Radioastronomía
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Brightness temperature
Position angle
Shock propagation
Polarization position
Field orientation
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:10915/145833

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network_name_str SEDICI (UNLP)
spelling Rapid variability in the southern blazar PKS 0521-365Romero, Gustavo EstebanCombi, Jorge ArielVucetich, HéctorCiencias AstronómicasBrightness temperaturePosition angleShock propagationPolarization positionField orientationWe present an intrinsic interpretation for the recently reported radio variability in the southern blazar PKS 0521-365. A shockedjet model can account for the quasi-periodical variations in the flux density of the source by means of inhomogeneities in the electron density with a quasi-periodic distribution along a jet in which a relativistic strong shock is propagating. These inhomogeneities are naturally produced by the effects of Kelvin-Helmholtz instabilities in the hypersonic parsec scale jet. The quasi-linear evolution of the polarization position angle can be understood as an effect of the “illumination” of successive cross sections with different mean field orientation or as a consequence of the shock propagation through a turbulent region in the jet. The high brightness temperature problem introduced by the short timescale varibility is solved invocating relativistic boosting with a moderately small viewing angle in agreement with the known structure of the source. In this context, several parameters are estimated.Instituto Argentino de RadioastronomíaFacultad de Ciencias Astronómicas y Geofísicas1995info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf183-204http://sedici.unlp.edu.ar/handle/10915/145833enginfo:eu-repo/semantics/altIdentifier/issn/0004-640Xinfo:eu-repo/semantics/altIdentifier/issn/1572-946Xinfo:eu-repo/semantics/altIdentifier/doi/10.1007/bf00613234info: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:UNLP2025-09-29T11:32:22Zoai:sedici.unlp.edu.ar:10915/145833Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:32:23.08SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Rapid variability in the southern blazar PKS 0521-365
title Rapid variability in the southern blazar PKS 0521-365
spellingShingle Rapid variability in the southern blazar PKS 0521-365
Romero, Gustavo Esteban
Ciencias Astronómicas
Brightness temperature
Position angle
Shock propagation
Polarization position
Field orientation
title_short Rapid variability in the southern blazar PKS 0521-365
title_full Rapid variability in the southern blazar PKS 0521-365
title_fullStr Rapid variability in the southern blazar PKS 0521-365
title_full_unstemmed Rapid variability in the southern blazar PKS 0521-365
title_sort Rapid variability in the southern blazar PKS 0521-365
dc.creator.none.fl_str_mv Romero, Gustavo Esteban
Combi, Jorge Ariel
Vucetich, Héctor
author Romero, Gustavo Esteban
author_facet Romero, Gustavo Esteban
Combi, Jorge Ariel
Vucetich, Héctor
author_role author
author2 Combi, Jorge Ariel
Vucetich, Héctor
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Brightness temperature
Position angle
Shock propagation
Polarization position
Field orientation
topic Ciencias Astronómicas
Brightness temperature
Position angle
Shock propagation
Polarization position
Field orientation
dc.description.none.fl_txt_mv We present an intrinsic interpretation for the recently reported radio variability in the southern blazar PKS 0521-365. A shockedjet model can account for the quasi-periodical variations in the flux density of the source by means of inhomogeneities in the electron density with a quasi-periodic distribution along a jet in which a relativistic strong shock is propagating. These inhomogeneities are naturally produced by the effects of Kelvin-Helmholtz instabilities in the hypersonic parsec scale jet. The quasi-linear evolution of the polarization position angle can be understood as an effect of the “illumination” of successive cross sections with different mean field orientation or as a consequence of the shock propagation through a turbulent region in the jet. The high brightness temperature problem introduced by the short timescale varibility is solved invocating relativistic boosting with a moderately small viewing angle in agreement with the known structure of the source. In this context, several parameters are estimated.
Instituto Argentino de Radioastronomía
Facultad de Ciencias Astronómicas y Geofísicas
description We present an intrinsic interpretation for the recently reported radio variability in the southern blazar PKS 0521-365. A shockedjet model can account for the quasi-periodical variations in the flux density of the source by means of inhomogeneities in the electron density with a quasi-periodic distribution along a jet in which a relativistic strong shock is propagating. These inhomogeneities are naturally produced by the effects of Kelvin-Helmholtz instabilities in the hypersonic parsec scale jet. The quasi-linear evolution of the polarization position angle can be understood as an effect of the “illumination” of successive cross sections with different mean field orientation or as a consequence of the shock propagation through a turbulent region in the jet. The high brightness temperature problem introduced by the short timescale varibility is solved invocating relativistic boosting with a moderately small viewing angle in agreement with the known structure of the source. In this context, several parameters are estimated.
publishDate 1995
dc.date.none.fl_str_mv 1995
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/10915/145833
url http://sedici.unlp.edu.ar/handle/10915/145833
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-640X
info:eu-repo/semantics/altIdentifier/issn/1572-946X
info:eu-repo/semantics/altIdentifier/doi/10.1007/bf00613234
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
183-204
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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