HESS J1741-302: a hidden accelerator in the Galactic plane

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dc.contributor.authorAbdalla, H.
dc.contributor.authorAbramowski, A.
dc.contributor.authorAharonian, F.
dc.contributor.authorBenkhali, F.
dc.contributor.authorAngüner, E.
dc.contributor.authorArakawa, M.
dc.contributor.authorArmand, C.
dc.contributor.authorArrieta, M.
dc.contributor.authorBackes, M.
dc.contributor.authorBalzer, A.
dc.contributor.authorBarnard, M.
dc.contributor.authorBecherini, Y.
dc.contributor.authorTjus, J.
dc.contributor.authorBerge, D.
dc.contributor.authorBernhard, S.
dc.contributor.authorBernlöhr, K.
dc.contributor.authorBlackwell, R.
dc.contributor.authorBöttcher, M.
dc.contributor.authorBoisson, C.
dc.contributor.authorBolmont, J.
dc.contributor.authoret al.
dc.date.issued2018
dc.description.abstractThe 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.
dc.description.statementofresponsibilityH. Abdalla … R. Blackwell … P. de Wilt … J. Hawkes … J. Lau … N. Maxted … G. Rowell … F. Voisin … et al. [The H.E.S.S. Collaboration]
dc.identifier.citationAstronomy and Astrophysics: a European journal, 2018; 612:A13-1-A13-8
dc.identifier.doi10.1051/0004-6361/201730581
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.urihttp://hdl.handle.net/2440/112108
dc.language.isoen
dc.publisherEDP Sciences
dc.relation.grantARC
dc.relation.grantCNRS-IN2P3
dc.rights© ESO 2018
dc.source.urihttps://doi.org/10.1051/0004-6361/201730581
dc.subjectGamma rays: ISM; gamma rays: general; cosmic rays; ISM: clouds
dc.titleHESS J1741-302: a hidden accelerator in the Galactic plane
dc.typeJournal article
pubs.publication-statusPublished

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