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An extreme particle accelerator in the Galactic plane: HESS J1826−130

The unidentified very-high-energy (VHE; <i>E<i/> > 0.1 TeV) <i>γ<i/>-ray source, HESS J1826−130, was discovered with the High Energy Stereoscopic System (HESS) in the Galactic plane. The analysis of 215 h of HESS data has revealed a steady <i>γ<i/>-ray flux fro...

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Main Authors: Abdalla, Hassan (Author) , Bernlöhr, Konrad (Author) , Glawion, Dorit (Author) , Hinton, James Anthony (Author) , Hofmann, Werner (Author) , Jankowsky, Felix (Author) , Marx, Ramin (Author) , Mohamed, Mahmoud (Author) , Quirrenbach, Andreas (Author) , Rieger, Frank M. (Author) , Schwemmer, Stephanie (Author) , Wagner, Stefan (Author) , Wierzcholska, Alicja (Author)
Corporate Author: H.E.S.S. Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 07 December 2020
In: Astronomy and astrophysics
Year: 2020, Volume: 644
ISSN:1432-0746
DOI:10.1051/0004-6361/202038851
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202038851
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2020/12/aa38851-20/aa38851-20.html
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Author Notes:H.E.S.S. Collaboration: H. Abdalla, K. Bernlöhr, D. Glawion, J.A. Hinton, W. Hofmann, F. Jankowsky, R. Marx, M. Mohamed, A. Quirrenbach, F. Rieger, S. Schwemmer, S.J. Wagner, A. Wierzcholska, [und 226 weitere]
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Summary:The unidentified very-high-energy (VHE; <i>E<i/> > 0.1 TeV) <i>γ<i/>-ray source, HESS J1826−130, was discovered with the High Energy Stereoscopic System (HESS) in the Galactic plane. The analysis of 215 h of HESS data has revealed a steady <i>γ<i/>-ray flux from HESS J1826−130, which appears extended with a half-width of 0.21° ± 0.02 ± 0.05 . The source spectrum is best fit with either a power-law function with a spectral index Γ = 1.78 ± 0.10<sub>stat<sub/> ± 0.20<sub>sys<sub/> and an exponential cut-off at 15.2 TeV, or a broken power-law with Γ<sub>1<sub/> = 1.96 ± 0.06<sub>stat<sub/> ± 0.20<sub>sys<sub/>, Γ<sub>2<sub/> = 3.59 ± 0.69<sub>stat<sub/> ± 0.20<sub>sys<sub/> for energies below and above <i>E<i/><sub>br<sub/> = 11.2 ± 2.7 TeV, respectively. The VHE flux from HESS J1826−130 is contaminated by the extended emission of the bright, nearby pulsar wind nebula, HESS J1825−137, particularly at the low end of the energy spectrum. Leptonic scenarios for the origin of HESS J1826−130 VHE emission related to PSR J1826−1256 are confronted by our spectral and morphological analysis. In a hadronic framework, taking into account the properties of dense gas regions surrounding HESS J1826−130, the source spectrum would imply an astrophysical object capable of accelerating the parent particle population up to ≳200 TeV. Our results are also discussed in a multiwavelength context, accounting for both the presence of nearby supernova remnants, molecular clouds, and counterparts detected in radio, X-rays, and TeV energies.
Item Description:Gesehen am 21.01.2021
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202038851

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