Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044
- Autores
- Sosa, Marina Soledad; von Essen, Carolina; Andruchow, Ileana; Cellone, Sergio Aldo
- Año de publicación
- 2017
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Blazars, a type of Active Galactic Nuclei, present a particular orientation of their jets close to the line of sight. Their radiation is thus relativistically beamed, giving rise to extreme behaviors, specially strong variability on very short timescales (i.e., microvariability). Here we present simultaneous photometric and polarimetric observations of two relatively nearby blazars, 1ES 1959+650 and HB89 2201+044, that were obtained using the Calar Alto Faint Object Spectrograph mounted at the 2.2 m telescope in Calar Alto, Spain. An outstanding characteristic of these two blazars is the presence of well resolved host galaxies. This particular feature allows us to produce a study of their intrinsic polarization, a measurement of the polarization state of the galactic nucleus unaffected by the host galaxy. To carry out this work, we computed photometric fluxes from which we calculated the degree and orientation of the blazars polarization. Then, we analyzed the depolarizing effect introduced by the host galaxy with the main goal to recover the intrinsic polarization of the galactic nucleus, carefully taking into consideration the spurious polarimetric variability introduced by changes in seeing along the observing nights. We find that the two blazars do not present intra-night photo-polarimetric variability, although we do detect a significant inter-night variability. Comparing polarimetric values before and after accounting for the host galaxies, we observe a significant difference in the polarization degree of about 1% in the case of 1ES 1959+650, and 0.3% in the case of HB89 2201+044, thus evidencing the non-negligible impact introduced by the host galaxies. We note that this host galaxy effect depends on the waveband, and varies with changing seeing conditions, so it should be particularly considered when studying frequency-dependent polarization in blazars.
Fil: Sosa, Marina Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: von Essen, Carolina. University Aarhus; Dinamarca
Fil: Andruchow, Ileana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Cellone, Sergio Aldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina - Materia
-
Bl Lacertae Objects: Individual: 1es 1959+650
Bl Lacertae Objects: Individual: Hb89 2201+044
Galaxies: Active
Techniques: Photometric
Techniques: Polarimetric - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/63028
Ver los metadatos del registro completo
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oai:ri.conicet.gov.ar:11336/63028 |
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3498 |
network_name_str |
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spelling |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044Sosa, Marina Soledadvon Essen, CarolinaAndruchow, IleanaCellone, Sergio AldoBl Lacertae Objects: Individual: 1es 1959+650Bl Lacertae Objects: Individual: Hb89 2201+044Galaxies: ActiveTechniques: PhotometricTechniques: Polarimetrichttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Blazars, a type of Active Galactic Nuclei, present a particular orientation of their jets close to the line of sight. Their radiation is thus relativistically beamed, giving rise to extreme behaviors, specially strong variability on very short timescales (i.e., microvariability). Here we present simultaneous photometric and polarimetric observations of two relatively nearby blazars, 1ES 1959+650 and HB89 2201+044, that were obtained using the Calar Alto Faint Object Spectrograph mounted at the 2.2 m telescope in Calar Alto, Spain. An outstanding characteristic of these two blazars is the presence of well resolved host galaxies. This particular feature allows us to produce a study of their intrinsic polarization, a measurement of the polarization state of the galactic nucleus unaffected by the host galaxy. To carry out this work, we computed photometric fluxes from which we calculated the degree and orientation of the blazars polarization. Then, we analyzed the depolarizing effect introduced by the host galaxy with the main goal to recover the intrinsic polarization of the galactic nucleus, carefully taking into consideration the spurious polarimetric variability introduced by changes in seeing along the observing nights. We find that the two blazars do not present intra-night photo-polarimetric variability, although we do detect a significant inter-night variability. Comparing polarimetric values before and after accounting for the host galaxies, we observe a significant difference in the polarization degree of about 1% in the case of 1ES 1959+650, and 0.3% in the case of HB89 2201+044, thus evidencing the non-negligible impact introduced by the host galaxies. We note that this host galaxy effect depends on the waveband, and varies with changing seeing conditions, so it should be particularly considered when studying frequency-dependent polarization in blazars.Fil: Sosa, Marina Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: von Essen, Carolina. University Aarhus; DinamarcaFil: Andruchow, Ileana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Cellone, Sergio Aldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaEDP Sciences2017-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/zipapplication/pdfhttp://hdl.handle.net/11336/63028Sosa, Marina Soledad; von Essen, Carolina; Andruchow, Ileana; Cellone, Sergio Aldo; Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044; EDP Sciences; Astronomy and Astrophysics; 607; 11-2017; 1-11; A490004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201629823info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2017/11/aa29823-16/aa29823-16.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 Técnicas2025-09-29T09:50:10Zoai:ri.conicet.gov.ar:11336/63028instacron: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 09:50:11.242CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 |
title |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 |
spellingShingle |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 Sosa, Marina Soledad Bl Lacertae Objects: Individual: 1es 1959+650 Bl Lacertae Objects: Individual: Hb89 2201+044 Galaxies: Active Techniques: Photometric Techniques: Polarimetric |
title_short |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 |
title_full |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 |
title_fullStr |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 |
title_full_unstemmed |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 |
title_sort |
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044 |
dc.creator.none.fl_str_mv |
Sosa, Marina Soledad von Essen, Carolina Andruchow, Ileana Cellone, Sergio Aldo |
author |
Sosa, Marina Soledad |
author_facet |
Sosa, Marina Soledad von Essen, Carolina Andruchow, Ileana Cellone, Sergio Aldo |
author_role |
author |
author2 |
von Essen, Carolina Andruchow, Ileana Cellone, Sergio Aldo |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Bl Lacertae Objects: Individual: 1es 1959+650 Bl Lacertae Objects: Individual: Hb89 2201+044 Galaxies: Active Techniques: Photometric Techniques: Polarimetric |
topic |
Bl Lacertae Objects: Individual: 1es 1959+650 Bl Lacertae Objects: Individual: Hb89 2201+044 Galaxies: Active Techniques: Photometric Techniques: Polarimetric |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Blazars, a type of Active Galactic Nuclei, present a particular orientation of their jets close to the line of sight. Their radiation is thus relativistically beamed, giving rise to extreme behaviors, specially strong variability on very short timescales (i.e., microvariability). Here we present simultaneous photometric and polarimetric observations of two relatively nearby blazars, 1ES 1959+650 and HB89 2201+044, that were obtained using the Calar Alto Faint Object Spectrograph mounted at the 2.2 m telescope in Calar Alto, Spain. An outstanding characteristic of these two blazars is the presence of well resolved host galaxies. This particular feature allows us to produce a study of their intrinsic polarization, a measurement of the polarization state of the galactic nucleus unaffected by the host galaxy. To carry out this work, we computed photometric fluxes from which we calculated the degree and orientation of the blazars polarization. Then, we analyzed the depolarizing effect introduced by the host galaxy with the main goal to recover the intrinsic polarization of the galactic nucleus, carefully taking into consideration the spurious polarimetric variability introduced by changes in seeing along the observing nights. We find that the two blazars do not present intra-night photo-polarimetric variability, although we do detect a significant inter-night variability. Comparing polarimetric values before and after accounting for the host galaxies, we observe a significant difference in the polarization degree of about 1% in the case of 1ES 1959+650, and 0.3% in the case of HB89 2201+044, thus evidencing the non-negligible impact introduced by the host galaxies. We note that this host galaxy effect depends on the waveband, and varies with changing seeing conditions, so it should be particularly considered when studying frequency-dependent polarization in blazars. Fil: Sosa, Marina Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: von Essen, Carolina. University Aarhus; Dinamarca Fil: Andruchow, Ileana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Cellone, Sergio Aldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina |
description |
Blazars, a type of Active Galactic Nuclei, present a particular orientation of their jets close to the line of sight. Their radiation is thus relativistically beamed, giving rise to extreme behaviors, specially strong variability on very short timescales (i.e., microvariability). Here we present simultaneous photometric and polarimetric observations of two relatively nearby blazars, 1ES 1959+650 and HB89 2201+044, that were obtained using the Calar Alto Faint Object Spectrograph mounted at the 2.2 m telescope in Calar Alto, Spain. An outstanding characteristic of these two blazars is the presence of well resolved host galaxies. This particular feature allows us to produce a study of their intrinsic polarization, a measurement of the polarization state of the galactic nucleus unaffected by the host galaxy. To carry out this work, we computed photometric fluxes from which we calculated the degree and orientation of the blazars polarization. Then, we analyzed the depolarizing effect introduced by the host galaxy with the main goal to recover the intrinsic polarization of the galactic nucleus, carefully taking into consideration the spurious polarimetric variability introduced by changes in seeing along the observing nights. We find that the two blazars do not present intra-night photo-polarimetric variability, although we do detect a significant inter-night variability. Comparing polarimetric values before and after accounting for the host galaxies, we observe a significant difference in the polarization degree of about 1% in the case of 1ES 1959+650, and 0.3% in the case of HB89 2201+044, thus evidencing the non-negligible impact introduced by the host galaxies. We note that this host galaxy effect depends on the waveband, and varies with changing seeing conditions, so it should be particularly considered when studying frequency-dependent polarization in blazars. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-11 |
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/11336/63028 Sosa, Marina Soledad; von Essen, Carolina; Andruchow, Ileana; Cellone, Sergio Aldo; Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044; EDP Sciences; Astronomy and Astrophysics; 607; 11-2017; 1-11; A49 0004-6361 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/63028 |
identifier_str_mv |
Sosa, Marina Soledad; von Essen, Carolina; Andruchow, Ileana; Cellone, Sergio Aldo; Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars: Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044; EDP Sciences; Astronomy and Astrophysics; 607; 11-2017; 1-11; A49 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/10.1051/0004-6361/201629823 info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2017/11/aa29823-16/aa29823-16.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/zip 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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1844613548192301056 |
score |
13.070432 |