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dc.contributor.authorAbramowski, A.
dc.contributor.authorBüsching, I.
dc.contributor.authorCasanova, S.
dc.contributor.authorDe Jager, O.C.
dc.contributor.authorPekeur, N.W.
dc.contributor.authorSheidaei, F.
dc.contributor.authorVenter, C.
dc.contributor.authorVorster, M.
dc.contributor.authorH.E.S.S. Collaboration
dc.date.accessioned2013-11-07T07:09:07Z
dc.date.available2013-11-07T07:09:07Z
dc.date.issued2012
dc.identifier.citationAbramowski, A. et al. 2012. Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589. Astronomy & astrophysics, 541: Article no A5. [https://doi.org/10.1051/0004-6361/201218843/]en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/9461
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201218843
dc.identifier.urihttp://www.aanda.org/articles/aa/pdf/2012/05/aa18843-12.pdf
dc.description.abstractThe Carina arm region, containing the supernova remnant SNR G284.3–1.8, the high-energy (HE; E > 100 MeV) binary 1FGL J1018.6–5856 and the energetic pulsar PSR J1016–5857 and its nebula, has been observed with the H.E.S.S. telescope array. The observational coverage of the region in very-high-energy (VHE; E > 0.1 TeV) γ-rays benefits from deep exposure (40 h) of the neighboring open cluster Westerlund 2. The observations have revealed a new extended region of VHE γ-ray emission. The new VHE source HESS J1018–589 shows a bright, point-like emission region positionally coincident with SNR G284.3–1.8 and 1FGL J1018.6–5856 and a diffuse extension towards the direction of PSR J1016–5857. A soft (Γ = 2.7 ± 0.5stat) photon index, with a differential flux at 1 TeV of N0 = (4.2 ± 1.1) × 10-13 TeV-1 cm-2 s-1 is found for the point-like source, whereas the total emission region including the diffuse emission region is well fit by a power-law function with spectral index Γ = 2.9 ± 0.4stat and differential flux at 1 TeV of N0 = (6.8 ± 1.6) × 10-13 TeV-1 cm-2 s-1. This H.E.S.S. detection motivated follow-up X-ray observations with the XMM-Newton satellite to investigate the origin of the VHE emission. The analysis of the XMM-Newton data resulted in the discovery of a bright, non-thermal point-like source (XMMU J101855.4–58564) with a photon index of Γ = 1.65 ± 0.08 in the center of SNR G284.3–1.8, and a thermal, extended emission region coincident with its bright northern filament. The characteristics of this thermal emission are used to estimate the plasma density in the region as n ≈ 0.5 cm-3 (2.9 kpc/d)2. The position of XMMU J101855.4–58564 is compatible with the position reported by the Fermi-LAT collaboration for the binary system 1FGL J1018.6–5856 and the variable Swift XRT source identified with it. The new X-ray data are used alongside archival multi-wavelength data to investigate the relationship between the VHE γ-ray emission from HESS J1018–589 and the various potential counterparts in the Carina arm region.en_US
dc.language.isoenen_US
dc.publisherEDP Sciencesen_US
dc.subjectGamma rays: starsen_US
dc.subjectISM: individual objects: SNRG284.3-1.8en_US
dc.subjectISM: individual objects: 1FGL J1018.6-5856en_US
dc.subjectISM: individual objects: PSRJ1016-5857en_US
dc.titleDiscovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589en_US
dc.typeArticleen_US
dc.contributor.researchID22050574 - Pekeur, Nicolette Whilna
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID12792322 - Vorster, Michael Johannes
dc.contributor.researchID22164405 - Sheidaei, Farzaneh
dc.contributor.researchID13235176 - Büsching, Ingo
dc.contributor.researchID23909196 - Casanova, Sabrina
dc.contributor.researchID10065857 - De Jager, Ocker Cornelis


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