Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/112108
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Type: Journal article
Title: HESS J1741-302: a hidden accelerator in the Galactic plane
Author: Abdalla, H.
Abramowski, A.
Aharonian, F.
Benkhali, F.
Angüner, E.
Arakawa, M.
Armand, C.
Arrieta, M.
Backes, M.
Balzer, A.
Barnard, M.
Becherini, Y.
Tjus, J.
Berge, D.
Bernhard, S.
Bernlöhr, K.
Blackwell, R.
Böttcher, M.
Boisson, C.
Bolmont, J.
et al.
Citation: Astronomy and Astrophysics, 2018; 612:A13-1-A13-8
Publisher: EDP Sciences
Issue Date: 2018
ISSN: 0004-6361
1432-0746
Statement of
Responsibility: 
H. Abdalla … R. Blackwell … P. de Wilt … J. Hawkes … J. Lau … N. Maxted … G. Rowell … F. Voisin … et al. [The H.E.S.S. Collaboration]
Abstract: The H.E.S.S. Collaboration has discovered a new very high energy (VHE, E > 0.1 TeV) γ-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 γ-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 Γ = 2.3 ± 0.2stat ± 0.2sys, 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 γ-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.
Keywords: Gamma rays: ISM; gamma rays: general; cosmic rays; ISM: clouds
Rights: © ESO 2018
RMID: 0030086203
DOI: 10.1051/0004-6361/201730581
Appears in Collections:IPAS publications
Physics publications

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