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

A. Abramowski Fabio Acero 1 F. Aharonian A. G. Akhperjanian G. Anton Agnès Balzer A. Barnacka U. Barres de Almeida Y. Becherini 2, 3 J. Becker B. Behera K. Bernlöhr E. Birsin J. Biteau 2 A. Bochow C. Boisson J. Bolmont P. Bordas J. Brucker F. Brun 2 P. Brun T. Bulik I. Büsching S. Carrigan S. Casanova M. Cerruti P. M. Chadwick A. Charbonnier R. C. G. Chaves A. Cheesebrough A. C. Clapson G. Cologna J. Conrad M. Dalton M. K. Daniel I. D. Davids B. Degrange 2 C. Deil H. J. Dickinson A. Djannati-Ataï 4 W. Domainko L. O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda K. Egberts P. Eger P. Espigat 3 L. Fallon C. Farnier 1 S. Fegan F. Feinstein 1 M. V. Fernandes A. Fiasson 5 F. Krayzel 5 G. Fontaine 2 A. Förster M. Füßling Y. A. Gallant 1 H. Gast L. Gérard 3 D. Gerbig B. Giebels 2 J. F. Glicenstein B. Glück P. Goret D. Göring S. Häffner J. D. Hague D. Hampf M. Hauser S. Heinz G. Heinzelmann G. Henri G. Hermann J. A. Hinton A. Hoffmann W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska O. C. de Jager C. Jahn M. Jamrozy I. Jung M. A. Kastendieck K. Katarzyński U. Katz S. Kaufmann D. Keogh D. Khangulyan B. Khélifi 2 D. Klochkov W. Kluźniak T. Kneiske Nu. Komin 5 K. Kosack R. Kossakowski 5 H. Laffon 2 G. Lamanna 5 D. Lennarz T. Lohse A. Lopatin C. -C. Lu V. Marandon A. Marcowith 1 J. Masbou 5 D. Maurin N. Maxted M. Mayer T. J. L. Mccomb M. C. Medina J. Méhault 6 R. Moderski Emmanuel Moulin C. L. Naumann M. Naumann-Godo M. de Naurois 2 D. Nedbal D. Nekrassov N. Nguyen B. Nicholas J. Niemiec S. J. Nolan S. Ohm E. de Oña Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter M. Paz Arribas G. Pedaletti G. Pelletier P. -O. Petrucci S. Pita 3 G. Pühlhofer M. Punch 3 A. Quirrenbach M. Raue S. M. Rayner A. Reimer O. Reimer M. Renaud 1 R. de Los Reyes F. Rieger J. Ripken L. Rob S. Rosier-Lees 5 G. Rowell B. Rudak C. B. Rulten J. Ruppel V. Sahakian D. A. Sanchez A. Santangelo R. Schlickeiser F. M. Schöck A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer F. Sheidaei 3 J. L. Skilton H. Sol G. Spengler Ł. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J. -P. Tavernet R. Terrier 3 M. Tluczykont K. Valerius C. van Eldik G. Vasileiadis 1 C. Venter A. Viana P. Vincent H. J. Völk F. Volpe S. Vorobiov 1 M. Vorster S. J. Wagner M. Ward R. White A. Wierzcholska M. Zacharias A. Zajczyk A. A. Zdziarski A. Zech H. -S. Zechlin
1 LUPM - Laboratoire Univers et Particules de Montpellier
2 LLR - Laboratoire Leprince-Ringuet
3 APC (UMR_7164) - AstroParticule et Cosmologie
4 APC - AHE - APC - Astrophysique des Hautes Energies
APC (UMR_7164) - AstroParticule et Cosmologie, Dipartimento di Astronomia, Universita degli Studi di Bologna
5 LAPP - Laboratoire d'Annecy de Physique des Particules
6 GLAST
LUPM - Laboratoire Univers et Particules de Montpellier
Abstract : 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.
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http://hal.in2p3.fr/in2p3-00684777
Contributor : Claudine Bombar <>
Submitted on : Tuesday, April 3, 2012 - 10:36:55 AM
Last modification on : Friday, July 16, 2021 - 11:20:03 AM

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UNIV-SAVOIE | IN2P3 | LAPP | LLR | CNRS | CEA | OBSPM | X-LLR | X | LUPM | MIPS | IRFU-APC | DSM-IRFU | UNIV-MONTPELLIER | CEA-DRF | X-DEP-PHYS | UNIV-PARIS7 | USPC | LUPM_EMA | UNIV-PARIS | UP-SCIENCES | PSL | UGA | APC

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A. Abramowski, Fabio Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, et al.. Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589. Astronomy and Astrophysics - A&A, EDP Sciences, 2012, 541, pp.A5. ⟨10.1051/0004-6361/201218843⟩. ⟨in2p3-00684777⟩

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