An extreme particle accelerator in the Galactic plane

• Verfasst von: Abdalla, Hassan [VerfasserIn]
• Verfasst von: Bernlöhr, Konrad [VerfasserIn]
• Verfasst von: Eisenacher Glawion, Dorit [VerfasserIn]
• Verfasst von: Hinton, James Anthony [VerfasserIn]
• Verfasst von: Hofmann, Werner [VerfasserIn]
• Verfasst von: Jankowsky, Felix [VerfasserIn]
• Verfasst von: Marx, Ramin [VerfasserIn]
• Verfasst von: Mohamed, Mahmoud [VerfasserIn]
• Verfasst von: Quirrenbach, Andreas [VerfasserIn]
• Verfasst von: Rieger, Frank M. [VerfasserIn]
• Verfasst von: Schwemmer, Stephanie [VerfasserIn]
• Verfasst von: Wagner, Stefan [VerfasserIn]
• Verfasst von: Wierzcholska, Alicja [VerfasserIn]
• Titel: An extreme particle accelerator in the Galactic plane
• Titelzusatz: HESS J1826−130
• Körperschaft: H.E.S.S. Collaboration [VerfasserIn]
• Verf.angabe: 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]
• E-Jahr: 2020
• Jahr: 07 December 2020
• Umfang: 8 S.
• Fussnoten: Gesehen am 21.01.2021
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2020
• Band/Heft Quelle: 644(2020) Artikel-Nummer A112, 8 Seiten
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/202038851
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1745169687

Abstract

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.