HESS J1741-302

• Verfasst von: Abdalla, Hassan [VerfasserIn]
• Verfasst von: Eisenacher Glawion, Dorit [VerfasserIn]
• Verfasst von: Jankowsky, Felix [VerfasserIn]
• Verfasst von: Mohamed, Mahmoud [VerfasserIn]
• Verfasst von: Quirrenbach, Andreas [VerfasserIn]
• Verfasst von: Schwemmer, Stephanie [VerfasserIn]
• Verfasst von: Wagner, Stefan [VerfasserIn]
• Verfasst von: Hofmann, Werner [VerfasserIn]
• Verfasst von: Rieger, Frank M. [VerfasserIn]
• Titel: HESS J1741-302
• Titelzusatz: a hidden accelerator in the Galactic plane
• Körperschaft: H.E.S.S. Collaboration [VerfasserIn]
• Verf.angabe: H.E.S.S. Collaboration: H. Abdalla, D. Glawion, W. Hofmann, F. Jankowsky, M. Mohamed, A. Quirrenbach, F. Rieger, S. Schwemmer, S.J. Wagner [und weitere]
• E-Jahr: 2018
• Jahr: 09 April 2018
• Umfang: 8 S.
• Fussnoten: Gesehen am 18.06.2019
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2018
• Band/Heft Quelle: 612(2018) Artikel-Nummer A13, 8 Seiten
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/201730581
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1666423548

Abstract

The H.E.S.S. Collaboration has discovered a new very high energy (VHE, <i>E<i/> > 0.1 TeV) <i>γ<i/>-ray source, HESS J1741−302, located in the Galactic plane. Despite several attempts to constrain its nature, no plausible counterpart has been found so far at X-ray and MeV/GeV <i>γ<i/>-ray energies, and the source remains unidentified. An analysis of 145-h of observations of HESS J1741−302 at VHEs has revealed a steady and relatively weak TeV source (~1% of the Crab Nebula flux), with a spectral index of <i>Γ<i/> = 2.3 ± 0.2<sub>stat<sub/> ± 0.2<sub>sys<sub/>, extending to energies up to 10 TeV without any clear signature of a cut-off. In a hadronic scenario, such a spectrum implies an object with particle acceleration up to energies of several hundred TeV. Contrary to most H.E.S.S. unidentified sources, the angular size of HESS J1741−302 is compatible with the H.E.S.S. point spread function at VHEs, with an extension constrained to be below 0.068° at a 99% confidence level. The <i>γ<i/>-ray emission detected by H.E.S.S. can be explained both within a hadronic scenario, due to collisions of protons with energies of hundreds of TeV with dense molecular clouds, and in a leptonic scenario, as a relic pulsar wind nebula, possibly powered by the middle-aged (20 kyr) pulsar PSR B1737−30. A binary scenario, related to the compact radio source 1LC 358.266+0.038 found to be spatially coincident with the best fit position of HESS J1741−302, is also envisaged.