Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589

• Autores: Abramowski, A.; Acero, F.; Aharonian, Felix A.; Akhperjanian, A. G.; Anton, G.; Medina, Maria Clementina; Spengler, G.; Stawarz, Ł.; Steenkamp, R.; Stegmann, C.; Stinzing, F.; Stycz, K.; Sushch, I.; Szostek, A.; Tavernet, J.-P.; Terrier, R.; Tluczykont, M.; Valerius, K.; van Eldik, C.; Vasileiadis, G.; Venter, C.; Viana, A.; Vincent, P.; Völk, H. J.; Volpe, F.; Vorobiov, S.; Vorster, M.; Wagner, S. J.; Ward, M.; White, R.; Wierzcholska, A.; Zacharias, M.; Zajczyk, A.; Zdziarski, A.; Zech, A.; Zechlin, H.-S.; H. E. S. S. Collaboration
• Año de publicación: 2012
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Gamma Rays; Ism: Individual Objects: Snrg284.3-1.8; Ism: Individual Objects: Psrj1016-5857; Interstellar Medium
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

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 N_0 = (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.
Fil: Abramowski, A.. Universität Hamburg; Alemania
Fil: Acero, F.. Université Montpellier; Francia
Fil: Aharonian, F.. Max-Planck-Institut für Kernphysik ; Alemania
Fil: Akhperjanian, A. G.. National Academy of Sciences of the Republic of Armenia ; Armenia
Fil: Anton, G.. Universität Erlangen-Nürnberg; Alemania
Fil: Medina, Maria Clementina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Spengler, G.. Université Paris Diderot - Paris 7; Francia
Fil: Stawarz, Ł.. University of Adelaide; Australia
Fil: Steenkamp, R.. The University of Leicester; Reino Unido
Fil: Stegmann, C.. Universität Erlangen-Nürnberg; Alemania
Fil: Stinzing, F.. Universität Erlangen-Nürnberg; Alemania
Fil: Stycz, K.. Universität Erlangen-Nürnberg; Alemania
Fil: Sushch, I.. Universität Hamburg; Alemania
Fil: Szostek, A.. University of Adelaide; Australia
Fil: Tavernet, J.-P.. Universität Tübingen; Alemania
Fil: Terrier, R.. Ecole Polytechnique ; Francia
Fil: Tluczykont, M.. Universität Hamburg; Alemania
Fil: Valerius, K.. Universität Erlangen-Nürnberg; Alemania
Fil: van Eldik, C.. Max-Planck-Institut für Kernphysik ; Alemania
Fil: Vasileiadis, G.. Université Montpellier; Francia
Fil: Venter, C.. University of Durham; Reino Unido
Fil: Viana, A.. Université Paris Diderot - Paris 7; Francia
Fil: Vincent, P.. Universität Tübingen; Alemania
Fil: Völk, H. J.. Max-Planck-Institut für Kernphysik; Alemania
Fil: Volpe, F.. Max-Planck-Institut für Kernphysik; Alemania
Fil: Vorobiov, S.. Université Montpellier; Francia
Fil: Vorster, M.. University of Durham; Reino Unido
Fil: Wagner, S. J.. Universität Heidelberg; Alemania
Fil: Ward, M.. Nicolaus Copernicus Astronomical Center; Polonia
Fil: White, R.. University of Leicester; Reino Unido
Fil: Wierzcholska, A.. University of Adelaide; Australia
Fil: Zacharias, M.. Humboldt-Universität zu Berlin; Alemania
Fil: Zajczyk, A.. Université Montpellier; Francia
Fil: Zdziarski, A.. University of Durham; Reino Unido
Fil: Zech, A.. Université Paris Diderot - Paris 7; Francia
Fil: Zechlin, H.-S.. Universität Hamburg; Alemania
Fil: H. E. S. S. Collaboration. No especifica;