Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/71316
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Type: | Journal article |
Title: | Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589 |
Author: | H.E.S.S. Collaboration, Abramowski, A. Acero, F. Aharonian, F. Akhperjanian, A. Anton, G. Balzer, A. Barnacka, A. Becherini, Y. Bernlöhr, K. Becker, J. Birsin, E. Biteau, J. Bochow, A. Boisson, C. Bolmont, J. Bordas, P. Brucker, J. Brun, F. Brun, P. et al. |
Citation: | Astronomy and Astrophysics: a European journal, 2012; 541:A5-1-A5-9 |
Publisher: | EDP Sciences |
Issue Date: | 2012 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | H.E.S.S. Collaboration, A. Abramowski ... N. Maxted ... B. Nicholas ... G. Rowell ... et al. |
Abstract: | The 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. |
Keywords: | gamma rays: stars ISM: individual objects: SNRG284.3-1.8 ISM: individual objects: 1FGL J1018.6-5856 ISM: individual objects: PSRJ1016-5857 |
Description: | Extent: 9p. |
Rights: | © ESO 2012 |
DOI: | 10.1051/0004-6361/201218843 |
Grant ID: | CNRS-IN2P3 |
Published version: | http://dx.doi.org/10.1051/0004-6361/201218843 |
Appears in Collections: | Aurora harvest IPAS publications |
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hdl_71316.pdf | Published version | 2.04 MB | Adobe PDF | View/Open |
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