HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object

Autores
Straal, S.; Gabanayi, K.; Vann Leeuwen, J.; Clarke, T.; Dubner, Gloria Mabel; Frey, S.; Giacani, Elsa Beatriz; Paragi, Z.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
HESS J1943+213 is an unidentified TeV source that is likely a high-frequency-peaked BL Lac (HBL) object, but that is also compatible with a pulsar wind nebula (PWN) nature. Each of these enormously different astronomical interpretations is supported by some of the observed unusual characteristics. In order to finally classify and understand this object, we took a three-pronged approach, through time-domain, high angular resolution, and multi-frequency radio studies. First, our deep time-domain observations with the Arecibo telescope failed to uncover the putative pulsar powering the proposed PWN. We conclude with ?70% certainty that HESS J1943+213 does not host a pulsar. Second, long-baseline interferometry of the source with e-MERLIN at 1.5 and 5 GHz shows only a core, that is, a point source at ? 1-100 mas resolution. Its 2013 flux density is about one-third lower than that detected in the 2011 observations with similar resolution. This radio variability of the core strengthens the HBL object hypothesis. Third, additional evidence against the PWN scenario comes from the radio spectrum we compiled. The extended structure follows a power-law behavior with spectral index α =-0.54+/- 0.04 while the core component displays a flat spectrum (α =-0.03+/- 0.03). In contrast, the radio synchrotron emission of PWNe predicts a single power-law distribution. Overall, we rule out the PWN hypothesis and conclude that the source is a BL Lac object. The consistently high fraction (70%) of the flux density from the extended structure then leads us to conclude that HESS J1943+213 must be a non-classical HBL object.
Fil: Straal, S.. University of Amsterdam; Países Bajos
Fil: Gabanayi, K.. Konkoly Observatory; Hungría
Fil: Vann Leeuwen, J.. University of Amsterdam; Países Bajos
Fil: Clarke, T.. Spece Sciences División. Naval Research Laboratory; Estados Unidos
Fil: Dubner, Gloria Mabel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Frey, S.. Satellite Geodetic Observatory; Hungría
Fil: Giacani, Elsa Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Paragi, Z.. Joint Institute for VLBI Eric (JIVE); Países Bajos
Materia
BL Lacertae objects: individual: HESS J1943+213
pulsars: general
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:11336/21542
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling HESS J1943+213: A Non-classical High-frequency-peaked BL Lac ObjectStraal, S.Gabanayi, K.Vann Leeuwen, J.Clarke, T.Dubner, Gloria MabelFrey, S.Giacani, Elsa BeatrizParagi, Z.BL Lacertae objects: individual: HESS J1943+213pulsars: generalhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1HESS J1943+213 is an unidentified TeV source that is likely a high-frequency-peaked BL Lac (HBL) object, but that is also compatible with a pulsar wind nebula (PWN) nature. Each of these enormously different astronomical interpretations is supported by some of the observed unusual characteristics. In order to finally classify and understand this object, we took a three-pronged approach, through time-domain, high angular resolution, and multi-frequency radio studies. First, our deep time-domain observations with the Arecibo telescope failed to uncover the putative pulsar powering the proposed PWN. We conclude with ?70% certainty that HESS J1943+213 does not host a pulsar. Second, long-baseline interferometry of the source with e-MERLIN at 1.5 and 5 GHz shows only a core, that is, a point source at ? 1-100 mas resolution. Its 2013 flux density is about one-third lower than that detected in the 2011 observations with similar resolution. This radio variability of the core strengthens the HBL object hypothesis. Third, additional evidence against the PWN scenario comes from the radio spectrum we compiled. The extended structure follows a power-law behavior with spectral index α =-0.54+/- 0.04 while the core component displays a flat spectrum (α =-0.03+/- 0.03). In contrast, the radio synchrotron emission of PWNe predicts a single power-law distribution. Overall, we rule out the PWN hypothesis and conclude that the source is a BL Lac object. The consistently high fraction (70%) of the flux density from the extended structure then leads us to conclude that HESS J1943+213 must be a non-classical HBL object.Fil: Straal, S.. University of Amsterdam; Países BajosFil: Gabanayi, K.. Konkoly Observatory; HungríaFil: Vann Leeuwen, J.. University of Amsterdam; Países BajosFil: Clarke, T.. Spece Sciences División. Naval Research Laboratory; Estados UnidosFil: Dubner, Gloria Mabel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Frey, S.. Satellite Geodetic Observatory; HungríaFil: Giacani, Elsa Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Paragi, Z.. Joint Institute for VLBI Eric (JIVE); Países BajosIOP Publishing2016-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/21542Straal, S.; Gabanayi, K.; Vann Leeuwen, J.; Clarke, T.; Dubner, Gloria Mabel; et al.; HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object; IOP Publishing; Astrophysical Journal; 822; 2; 5-2016; 117,1-90004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3847/0004-637X/822/2/117info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.3847/0004-637X/822/2/117info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1603.01226info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:16:15Zoai:ri.conicet.gov.ar:11336/21542instacron: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:34982025-10-22 11:16:15.871CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
title HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
spellingShingle HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
Straal, S.
BL Lacertae objects: individual: HESS J1943+213
pulsars: general
title_short HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
title_full HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
title_fullStr HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
title_full_unstemmed HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
title_sort HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
dc.creator.none.fl_str_mv Straal, S.
Gabanayi, K.
Vann Leeuwen, J.
Clarke, T.
Dubner, Gloria Mabel
Frey, S.
Giacani, Elsa Beatriz
Paragi, Z.
author Straal, S.
author_facet Straal, S.
Gabanayi, K.
Vann Leeuwen, J.
Clarke, T.
Dubner, Gloria Mabel
Frey, S.
Giacani, Elsa Beatriz
Paragi, Z.
author_role author
author2 Gabanayi, K.
Vann Leeuwen, J.
Clarke, T.
Dubner, Gloria Mabel
Frey, S.
Giacani, Elsa Beatriz
Paragi, Z.
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv BL Lacertae objects: individual: HESS J1943+213
pulsars: general
topic BL Lacertae objects: individual: HESS J1943+213
pulsars: general
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv HESS J1943+213 is an unidentified TeV source that is likely a high-frequency-peaked BL Lac (HBL) object, but that is also compatible with a pulsar wind nebula (PWN) nature. Each of these enormously different astronomical interpretations is supported by some of the observed unusual characteristics. In order to finally classify and understand this object, we took a three-pronged approach, through time-domain, high angular resolution, and multi-frequency radio studies. First, our deep time-domain observations with the Arecibo telescope failed to uncover the putative pulsar powering the proposed PWN. We conclude with ?70% certainty that HESS J1943+213 does not host a pulsar. Second, long-baseline interferometry of the source with e-MERLIN at 1.5 and 5 GHz shows only a core, that is, a point source at ? 1-100 mas resolution. Its 2013 flux density is about one-third lower than that detected in the 2011 observations with similar resolution. This radio variability of the core strengthens the HBL object hypothesis. Third, additional evidence against the PWN scenario comes from the radio spectrum we compiled. The extended structure follows a power-law behavior with spectral index α =-0.54+/- 0.04 while the core component displays a flat spectrum (α =-0.03+/- 0.03). In contrast, the radio synchrotron emission of PWNe predicts a single power-law distribution. Overall, we rule out the PWN hypothesis and conclude that the source is a BL Lac object. The consistently high fraction (70%) of the flux density from the extended structure then leads us to conclude that HESS J1943+213 must be a non-classical HBL object.
Fil: Straal, S.. University of Amsterdam; Países Bajos
Fil: Gabanayi, K.. Konkoly Observatory; Hungría
Fil: Vann Leeuwen, J.. University of Amsterdam; Países Bajos
Fil: Clarke, T.. Spece Sciences División. Naval Research Laboratory; Estados Unidos
Fil: Dubner, Gloria Mabel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Frey, S.. Satellite Geodetic Observatory; Hungría
Fil: Giacani, Elsa Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Paragi, Z.. Joint Institute for VLBI Eric (JIVE); Países Bajos
description HESS J1943+213 is an unidentified TeV source that is likely a high-frequency-peaked BL Lac (HBL) object, but that is also compatible with a pulsar wind nebula (PWN) nature. Each of these enormously different astronomical interpretations is supported by some of the observed unusual characteristics. In order to finally classify and understand this object, we took a three-pronged approach, through time-domain, high angular resolution, and multi-frequency radio studies. First, our deep time-domain observations with the Arecibo telescope failed to uncover the putative pulsar powering the proposed PWN. We conclude with ?70% certainty that HESS J1943+213 does not host a pulsar. Second, long-baseline interferometry of the source with e-MERLIN at 1.5 and 5 GHz shows only a core, that is, a point source at ? 1-100 mas resolution. Its 2013 flux density is about one-third lower than that detected in the 2011 observations with similar resolution. This radio variability of the core strengthens the HBL object hypothesis. Third, additional evidence against the PWN scenario comes from the radio spectrum we compiled. The extended structure follows a power-law behavior with spectral index α =-0.54+/- 0.04 while the core component displays a flat spectrum (α =-0.03+/- 0.03). In contrast, the radio synchrotron emission of PWNe predicts a single power-law distribution. Overall, we rule out the PWN hypothesis and conclude that the source is a BL Lac object. The consistently high fraction (70%) of the flux density from the extended structure then leads us to conclude that HESS J1943+213 must be a non-classical HBL object.
publishDate 2016
dc.date.none.fl_str_mv 2016-05
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/11336/21542
Straal, S.; Gabanayi, K.; Vann Leeuwen, J.; Clarke, T.; Dubner, Gloria Mabel; et al.; HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object; IOP Publishing; Astrophysical Journal; 822; 2; 5-2016; 117,1-9
0004-637X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/21542
identifier_str_mv Straal, S.; Gabanayi, K.; Vann Leeuwen, J.; Clarke, T.; Dubner, Gloria Mabel; et al.; HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object; IOP Publishing; Astrophysical Journal; 822; 2; 5-2016; 117,1-9
0004-637X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.3847/0004-637X/822/2/117
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.3847/0004-637X/822/2/117
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1603.01226
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/pdf
application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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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