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
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/63028

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network_name_str CONICET Digital (CONICET)
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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