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Straal, S.M.; Gabányi, K.É.; Van Leeuwen, J.; Clarke, T.E.; Dubner, G.; Frey, S.; Giacani, E.; Paragi, Z. "HESS J1943+213: A NON-CLASSICAL HIGH-FREQUENCY-PEAKED BL LAC OBJECT" (2016) Astrophysical Journal. 822(2)
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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. © 2016. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:HESS J1943+213: A NON-CLASSICAL HIGH-FREQUENCY-PEAKED BL LAC OBJECT
Autor:Straal, S.M.; Gabányi, K.É.; Van Leeuwen, J.; Clarke, T.E.; Dubner, G.; Frey, S.; Giacani, E.; Paragi, Z.
Filiación:Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, P.O. Box 94249, Amsterdam, 1090 GE, Netherlands
ASTRON, Netherlands Institute for Radio Astronomy, P.O. Box 2, Dwingeloo, 7990 AA, Netherlands
FÖMI Satellite Geodetic Observatory, P.O. Box 585, Budapest, H-1592, Hungary
Konkoly Observatory, MTA Research Centre for Astronomy and Earth Sciences, P.O. Box 67, Budapest, H-1525, Hungary
U.S. Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, United States
Instituto de Astronomía y Física Del Espacio (IAFE, CONICET-UBA), CC 67, Suc. 28, Buenos Aires, 1428, Argentina
Joint Institute for VLBI Eric (JIVE), Postbus 2, Dwingeloo, 7990 AA, Netherlands
Palabras clave:BL Lacertae objects: individual (HESS J1943+213); pulsars: general
Año:2016
Volumen:822
Número:2
DOI: http://dx.doi.org/10.3847/0004-637X/822/2/117
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v822_n2_p_Straal

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Citas:

---------- APA ----------
Straal, S.M., Gabányi, K.É., Van Leeuwen, J., Clarke, T.E., Dubner, G., Frey, S., Giacani, E.,..., Paragi, Z. (2016) . HESS J1943+213: A NON-CLASSICAL HIGH-FREQUENCY-PEAKED BL LAC OBJECT. Astrophysical Journal, 822(2).
http://dx.doi.org/10.3847/0004-637X/822/2/117
---------- CHICAGO ----------
Straal, S.M., Gabányi, K.É., Van Leeuwen, J., Clarke, T.E., Dubner, G., Frey, S., et al. "HESS J1943+213: A NON-CLASSICAL HIGH-FREQUENCY-PEAKED BL LAC OBJECT" . Astrophysical Journal 822, no. 2 (2016).
http://dx.doi.org/10.3847/0004-637X/822/2/117
---------- MLA ----------
Straal, S.M., Gabányi, K.É., Van Leeuwen, J., Clarke, T.E., Dubner, G., Frey, S., et al. "HESS J1943+213: A NON-CLASSICAL HIGH-FREQUENCY-PEAKED BL LAC OBJECT" . Astrophysical Journal, vol. 822, no. 2, 2016.
http://dx.doi.org/10.3847/0004-637X/822/2/117
---------- VANCOUVER ----------
Straal, S.M., Gabányi, K.É., Van Leeuwen, J., Clarke, T.E., Dubner, G., Frey, S., et al. HESS J1943+213: A NON-CLASSICAL HIGH-FREQUENCY-PEAKED BL LAC OBJECT. Astrophys. J. 2016;822(2).
http://dx.doi.org/10.3847/0004-637X/822/2/117