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dc.contributor.author
Straal, S.
dc.contributor.author
Gabanayi, K.
dc.contributor.author
Vann Leeuwen, J.
dc.contributor.author
Clarke, T.
dc.contributor.author
Dubner, Gloria Mabel
dc.contributor.author
Frey, S.
dc.contributor.author
Giacani, Elsa Beatriz
dc.contributor.author
Paragi, Z.
dc.date.available
2017-07-28T18:59:09Z
dc.date.issued
2016-05
dc.identifier.citation
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
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/21542
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Bl Lacertae Objects: Individual: Hess J1943+213
dc.subject
Pulsars: General
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
HESS J1943+213: A Non-classical High-frequency-peaked BL Lac Object
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-27T12:48:29Z
dc.journal.volume
822
dc.journal.number
2
dc.journal.pagination
117,1-9
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Straal, S.. University of Amsterdam; Países Bajos
dc.description.fil
Fil: Gabanayi, K.. Konkoly Observatory; Hungría
dc.description.fil
Fil: Vann Leeuwen, J.. University of Amsterdam; Países Bajos
dc.description.fil
Fil: Clarke, T.. Spece Sciences División. Naval Research Laboratory; Estados Unidos
dc.description.fil
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
dc.description.fil
Fil: Frey, S.. Satellite Geodetic Observatory; Hungría
dc.description.fil
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
dc.description.fil
Fil: Paragi, Z.. Joint Institute for VLBI Eric (JIVE); Países Bajos
dc.journal.title
Astrophysical Journal
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/0004-637X/822/2/117
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.3847/0004-637X/822/2/117
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1603.01226


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