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
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/145833
Ver los metadatos del registro completo
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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:UNLP2025-10-22T17:13:17Zoai: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:13292025-10-22 17:13:17.352SEDICI (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 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://sedici.unlp.edu.ar/handle/10915/145833 |
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http://sedici.unlp.edu.ar/handle/10915/145833 |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
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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 |
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