Discovery of VHE emission towards the Carina arm region with the HESS telescope array: HESSJ1018-589

被引:24
作者
Abramowski, A. [1 ]
Acero, F. [2 ]
Aharonian, F. [3 ,4 ,5 ]
Akhperjanian, A. G. [5 ,6 ]
Anton, G. [7 ]
Balzer, A. [7 ]
Barnacka, A. [8 ,9 ]
Becherini, Y. [10 ,11 ]
Becker, J. [12 ]
Bernloehr, K. [3 ,13 ]
Birsin, E. [13 ]
Biteau, J. [11 ]
Bochow, A. [3 ]
Boisson, C. [14 ]
Bolmont, J. [15 ]
Bordas, P. [16 ]
Brucker, J. [7 ]
Brun, F. [11 ]
Brun, P. [9 ]
Bulik, T. [17 ]
Buesching, I. [12 ,18 ]
Carrigan, S. [3 ]
Casanova, S. [3 ,18 ]
Cerruti, M. [14 ]
Chadwick, P. M. [19 ]
Charbonnier, A. [15 ]
Chaves, R. C. G. [3 ,9 ]
Cheesebrough, A. [19 ]
Cologna, G. [20 ]
Conrad, J. [21 ]
Dalton, M. [13 ]
Daniel, M. K. [19 ]
Davids, I. D. [22 ]
Degrange, B. [11 ]
Deil, C. [3 ]
Dickinson, H. J. [21 ]
Djannati-Atai, A. [10 ]
Domainko, W. [3 ]
Drury, L. O'C [4 ]
Dubus, G. [23 ]
Dutson, K. [24 ]
Dyks, J. [8 ]
Dyrda, M. [25 ]
Egberts, K. [26 ]
Eger, P. [7 ]
Espigat, P. [10 ]
Fallon, L. [4 ]
Fegan, S. [11 ]
Feinstein, F. [2 ]
Fernandes, M. V. [1 ]
机构
[1] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany
[2] Univ Montpellier 2, CNRS, IN2P3, Lab Univers & Particules Montpellier, F-34095 Montpellier 5, France
[3] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
[4] Dublin Inst Adv Studies, Dublin 2, Ireland
[5] Natl Acad Sci Republ Armenia, Yerevan, Armenia
[6] Yerevan Phys Inst, Yerevan 375036, Armenia
[7] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany
[8] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland
[9] CEA Saclay, DSM IRFU, F-91191 Gif Sur Yvette, France
[10] Univ Paris 07, CEA, Observ Paris, CNRS,UMR 7164, F-75205 Paris 13, France
[11] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France
[12] Ruhr Univ Bochum, Inst Theoret Phys, Lehrstuhl Weltraum & Astrophys 4, D-44780 Bochum, Germany
[13] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[14] Univ Paris Diderot, CNRS, Observ Paris, LUTH, F-92190 Meudon, France
[15] Univ Paris 07, LPNHE, Univ Paris 06, CNRS,IN2P3, F-75252 Paris 5, France
[16] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany
[17] Univ Warsaw, Astron Observ, PL-00478 Warsaw, Poland
[18] North West Univ, Unit Space Phys, ZA-2520 Potchefstroom, South Africa
[19] Univ Durham, Dept Phys, Durham DH1 3LE, England
[20] Heidelberg Univ, D-69117 Heidelberg, Germany
[21] Stockholm Univ, Albanova Univ Ctr, Dept Phys, Oskar Klein Ctr, S-10691 Stockholm, Sweden
[22] Univ Namibia, Dept Phys, Windhoek, Namibia
[23] Univ Grenoble 1, INSU CNRS, Lab Astrophys Grenoble, F-38041 Grenoble 9, France
[24] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[25] Inst Fizyki Jadrowej PAN, PL-31342 Krakow, Poland
[26] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria
[27] Univ Savoie, IN2P3, CNRS, Lab Annecy le Vieux Phys Particules, F-74941 Annecy Le Vieux, France
[28] Uniwersytet Jagiellonski, Obserwatorium Astron, PL-30244 Krakow, Poland
[29] Nicolaus Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland
[30] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia
[31] Charles Univ Prague, Fac Math & Phys, Inst Particle & Nucl Phys, CR-18000 Prague 8, Czech Republic
[32] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England
[33] CNRS & MPG, European Associated Lab Gamma Ray Astron, Paris, France
基金
新加坡国家研究基金会; 美国国家航空航天局; 英国科学技术设施理事会;
关键词
gamma rays: stars; ISM: individual objects: SNRG284.3-1.8; ISM: individual objects: 1FGL J1018.6-5856; ISM: individual objects: PSRJ1016-5857; ENERGY GAMMA-RAYS; PHOTON IMAGING CAMERA; XMM-NEWTON; MOLECULAR CLOUDS; NEBULA; TEV; ACCELERATION; RADIATION;
D O I
10.1051/0004-6361/201218843
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Carina arm region, containing the supernova remnant SNRG284.3-1.8, the high-energy (HE; E > 100 MeV) binary 1FGL J1018.6-5856 and the energetic pulsar PSRJ1016-5857 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 > 0.1TeV) 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 SNRG284.3-1.8 and 1FGL J1018.6-5856 and a diffuse extension towards the direction of PSRJ1016-5857. A soft (Gamma = 2.7 +/- 0.5(stat)) photon index, with a differential flux at 1 TeV of N-0 = (4.2 +/- 1.1) x 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(stat) and differential flux at 1 TeV of N-0 = (6.8 +/- 1.6) x 10(-1)3 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 approximate to 0.5 cm(-3) (2.9 kpc/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 HESS J1018-589 and the various potential counterparts in the Carina arm region.
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页数:9
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