Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/129833
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Type: Journal article
Title: An extreme particle accelerator in the Galactic plane: HESS J1826-130
Author: Angüner, E.O.
Casanova, S.
Bordas, P.
Oya, I.
Ziegler, A.
Einecke, S.
Feijen, K.
de Wilt, P.
Rowell, G.
Citation: Astronomy and Astrophysics: a European journal, 2020; 644:1-9
Publisher: EDP Sciences
Issue Date: 2020
ISSN: 0004-6361
1432-0746
Statement of
Responsibility: 
H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali ... Gavin Rowell ... Sabrina Einecke ... et al.
Abstract: The unidentified very-high-energy (VHE; E > 0.1 TeV) γ-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 γ-ray flux from HESS J1826−130, which appears extended with a half-width of 0.21° ± 0.02stat° ± 0.05sys°. The source spectrum is best fit with either a power-law function with a spectral index Γ = 1.78 ± 0.10stat ± 0.20sys and an exponential cut-off at 15.2−3.2+5.5 TeV, or a broken power-law with Γ1 = 1.96 ± 0.06stat ± 0.20sys, Γ2 = 3.59 ± 0.69stat ± 0.20sys for energies below and above Ebr = 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.
Keywords: ISM: supernova remnants / ISM: clouds / gamma rays: general / gamma rays: ISM
Rights: © H.E.S.S. Collaboration 2020.
DOI: 10.1051/0004-6361/202038851
Published version: http://dx.doi.org/10.1051/0004-6361/202038851
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