Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589
Creators: name: HESS Collaboration
name: Abramowski, A.
name: Acero, F.
name: Aharonian, F.
name: Akhperjanian, A. G.
name: Anton, G.
name: Balzer, A.
name: Barnacka, A.
name: de Almeida, U. Barres
name: Becherini, Y.
name: Becker, J.
name: Behera, B.
name: Bernlöhr, K.
name: Birsin, E.
name: Biteau, J.
name: Bochow, A.
name: Boisson, C.
name: Bolmont, J.
name: Bordas, P.
name: Brucker, J.
name: Brun, F.
name: Brun, P.
name: Bulik, T.
name: Büsching, I.
name: Carrigan, S.
name: Casanova, S.
name: Cerruti, M.
name: Chadwick, P. M.
name: Charbonnier, A.
name: Chaves, R. C. G.
name: Cheesebrough, A.
name: Clapson, A. C.
name: Coignet, G.
name: Cologna, G.
name: Conrad, J.
name: Dalton, M.
name: Daniel, M. K.
name: Davids, I. D.
name: Degrange, B.
name: Deil, C.
name: Dickinson, H. J.
name: Djannati-Ataï, A.
name: Domainko, W.
name: Drury, L. O'C.
name: Dubus, G.
name: Dutson, K.
name: Dyks, J.
name: Dyrda, M.
name: Egberts, K.
name: Eger, P.
name: Espigat, P.
name: Fallon, L.
name: Farnier, C.
name: Fegan, S.
name: Feinstein, F.
name: Fernandes, M. V.
name: Fiasson, A.
name: Fontaine, G.
name: Förster, A.
name: Füßling, M.
name: Gallant, Y. A.
name: Gast, H.
name: Gérard, L.
name: Gerbig, D.
name: Giebels, B.
name: Glicenstein, J. F.
name: Glück, B.
name: Goret, P.
name: Göring, D.
name: Häffner, S.
name: Hague, J. D.
name: Hampf, D.
name: Hauser, M.
name: Heinz, S.
name: Heinzelmann, G.
name: Henri, G.
name: Hermann, G.
name: Hinton, J. A.
name: Hoffmann, A.
name: Hofmann, W.
name: Hofverberg, P.
name: Holler, M.
name: Horns, D.
name: Jacholkowska, A.
name: de Jager, O. C.
name: Jahn, C.
name: Jamrozy, M.
name: Jung, I.
name: Kastendieck, M. A.
name: Katarzyński, K.
name: Katz, U.
name: Kaufmann, S.
name: Keogh, D.
name: Khangulyan, D.
name: Khélifi, B.
name: Klochkov, D.
name: Kluźniak, W.
name: Kneiske, T.
name: Komin, Nu.
name: Kosack, K.
name: Kossakowski, R.
name: Laffon, H.
name: Lamanna, G.
name: Lennarz, D.
name: Lohse, T.
name: Lopatin, A.
name: Lu, C. -C.
name: Marandon, V.
name: Marcowith, A.
name: Masbou, J.
name: Maurin, D.
name: Maxted, N.
name: Mayer, M.
name: McComb, T. J. L.
name: Medina, M. C.
name: Méhault, J.
name: Moderski, R.
name: Moulin, E.
name: Naumann, C. L.
name: Naumann-Godo, M.
name: de Naurois, M.
name: Nedbal, D.
name: Nekrassov, D.
name: Nguyen, N.
name: Nicholas, B.
name: Niemiec, J.
name: Nolan, S. J.
name: Ohm, S.
name: Wilhelmi, E. de Oña
name: Opitz, B.
name: Ostrowski, M.
name: Oya, I.
name: Panter, M.
name: Arribas, M. Paz
name: Pedaletti1, G.
name: Pelletier, G.
name: Petrucci, P. -O.
name: Pita, S.
name: Pühlhofer, G.
name: Punch, M.
name: Quirrenbach, A.
name: Raue, M.
name: Rayner, S. M.
name: Reimer, A.
name: Reimer, O.
name: Renaud, M.
name: Reyes, R. de los
name: Rieger, F.
name: Ripken, J.
name: Rob, L.
name: Rosier-Lees, S.
name: Rowell, G.
name: Rudak, B.
name: Rulten, C. B.
name: Ruppel, J.
name: Sahakian, V.
name: Sanchez, D. A.
name: Santangelo, A.
name: Schlickeiser, R.
name: Schöck, F. M.
name: Schulz, A.
name: Schwanke, U.
name: Schwarzburg, S.
name: Schwemmer, S.
name: Sheidaei, F.
name: Skilton, J. L.
name: Sol, H.
name: Spengler, G.
name: Stawarz, Ł.
name: Steenkamp, R.
name: Stegmann, C.
name: Stinzing, F.
name: Stycz, K.
name: Sushch, I.
name: Szostek, A.
name: Tavernet, J. -P.
name: Terrier, R.
name: Tluczykont, M.
name: Valerius, K.
name: van Eldik, C.
name: Vasileiadis, G.
name: Venter, C.
name: Vialle, J. P.
name: Viana, A.
name: Vincent, P.
name: Völk, H. J.
name: Volpe, F.
name: Vorobiov, S.
name: Vorster, M.
name: Wagner, S. J.
name: Ward, M.
name: White, R.
name: Wierzcholska, A.
name: Zacharias, M.
name: Zajczyk, A.
name: Zdziarski, A. A.
name: Zech, A.
name: Zechlin, H. -S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The observational coverage with HESS of the Carina region in VHE gamma-rays benefits from deep exposure (40 h) of the neighboring open cluster Westerlund 2. The observations have revealed a new extended region of VHE gamma-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 Gamma=2.7+-0.5 photon index, with a differential flux at 1TeV 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 Gamma=2.9+-0.4 and differential flux at 1TeV 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 Gamma=1.65+-0.08 in the center of SNRG284.3-1.8, 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(2.9kpc/d)^2. The position of XMMUJ101855.4-58564 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 gamma-ray emission from HESSJ1018-589 and the various potential counterparts in the Carina arm region.
description: accepted in A&amp;A