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Detection of very-high-energy gamma-ray emission from the vicinity of PSR B1706-44 and G343.1-2.3 with H.E.S.S

A. Abramowski Fabio Acero 1 F. Aharonian A.G. Akhperjanian G. Anton A. Barnacka U. Barres de Almeida 2 A.R. Bazer-Bachi 3 Y. Becherini 4 J. Becker B. Behera K. Bernlöhr A. Bochow C. Boisson 5 J. Bolmont 6 P. Bordas V. Borrel 3 J. Brucker F. Brun P. Brun 2 T. Bulik I. Büsching S. Carrigan S. Casanova M. Cerruti 5 P.M. Chadwick A. Charbonnier 6 R.C.G. Chaves A. Cheesebrough J. Conrad L.-M. Chounet 7 A.C. Clapson G. Coignet 8 M. Dalton M.K. Daniel I.D. Davids B. Degrange 7 C. Deil H.J. Dickinson A. Djannati-Ataï 9 W. Domainko L.O'C. Drury F. Dubois 8 G. Dubus 10 J. Dyks M. Dyrda K. Egberts P. Eger P. Espigat 4 L. Fallon C. Farnier 1 S. Fegan 7 F. Feinstein 1 M.V. Fernandes A. Fiasson 8 A. Förster G. Fontaine 7 M. Füßling S. Gabici 3 Y.A. Gallant 1 H. Gast L. Gérard 4 D. Gerbig B. Giebels 7 J.F. Glicenstein 2 B. Glück P. Goret 2 D. Göring J.D. Hague D. Hampf M. Hauser S. Heinz G. Heinzelmann G. Henri 10 G. Hermann J.A. Hinton A. Hoffmann W. Hofmann P. Hofverberg M. Holleran S. Hoppe D. Horns A. Jacholkowska 6 O.C. de Jager C. Jahn M. Jamrozy I. Jung M.A. Kastendieck K. Katarzy'Nski U. Katz S. Kaufmann M. Kerschhaggl D. Khangulyan B. Kh'Elifi 7 D. Keogh W. Klu'Zniak T. Kneiske Nu. Komin 8 K. Kosack 2 R. Kossakowski 8 H. Laffont G. Lamanna 8 M. Lemoine-Goumard 11 J.-P. Lenain 5 D. Lennarz T. Lohse A. Lopatin C.-C. Lu V. Marandon 4 A. Marcowith 1 J. Masbou 8 D. Maurin 6 N. Maxted T.J.L. Mccomb M.C. Medina J. Méhault 1 R. Moderski Emmanuel Moulin 2 M. Naumann-Godo M. de Naurois 6 D. Nedbal D. Nekrassov N. Nguyen B. Nicholas J. Niemiec S.J. Nolan S. Ohm J.-F. Olive 3 E. de Oña Wilhelmi B. Opitz M. Ostrowski M. Panter M. Paz Arribas G. Pedaletti G. Pelletier 10 P.-O. Petrucci 10 S. Pita 4 G. P¨uhlhofer M. Punch 4 A. Quirrenbach M. Raue S.M. Rayner A. Reimer O. Reimer M. Renaud 4 R. de los Reyes F. Rieger J. Ripken L. Rob 7 S. Rosier-Lees 8 G. Rowell B. Rudak C.B. Rulten J. Ruppel F. Ryde V. Sahakian A. Santangelo R. Schlickeiser F.M. Schöck A. Schönwald U. Schwanke S. Schwarzburg S. Schwemmer A. Shalchi I. Sushch M. Sikora J.L. Skilton H. Sol 5 G. Spengler Ł. Stawarz R. Steenkamp 1 C. Stegmann F. Stinzing A. Szostek 10 P.H. Tam J.-P. Tavernet 6 R. Terrier 4 O. Tibolla M. Tluczykont 3, 7 K. Valerius C. van Eldik G. Vasileiadis 1 C. Venter J.P. Vialle 8 A. Viana P. Vincent 6 M. Vivier 2 H.J. Völk F. Volpe 7 S. Vorobiov 1 S.J. Wagner M. Ward A. Wierzcholska A. Zajczyk A.A. Zdziarski A. Zech 5 H.-S. Zechlin G. Dubner E. Giacani
Abstract : The gamma-ray pulsar PSR B1706-44 and the adjacent supernova remnant (SNR) candidate G343.1-2.3 were observed by H.E.S.S. during a dedicated observation campaign in 2007. As a result of this observation campaign, a new source of very-high-energy (VHE; E > 100 GeV) gamma-ray emission, HESS J1708-443, was detected with a statistical significance of 7 sigma, although no significant point-like emission was detected at the position of the energetic pulsar itself. In this paper, the morphological and spectral analyses of the newly-discovered TeV source are presented. The centroid of HESS J1708-443 is considerably offset from the pulsar and located near the apparent center of the SNR, at RA(J2000) = 17h08m11s +/- 17s and Dec(J2000) = -44d20' +/- 4'. The source is found to be significantly more extended than the H.E.S.S. point spread function (~0.1 deg), with an intrinsic Gaussian width of 0.29 deg +/- 0.04 deg. Its integral flux between 1 and 10 TeV is ~ 3.8 x 10^-12 ph cm^-2 s^-1, equivalent to 17% of the Crab Nebula flux in the same energy range. The measured energy spectrum is well-fit by a power law with a relatively hard photon index Gamma = 2.0 +/- 0.1 (stat) +/- 0.2 (sys). Additional multi-wavelength data, including 330 MHz VLA observations, were used to investigate the VHE gamma-ray source's possible associations with the pulsar wind nebula of PSR B1706-44 and/or with the complex radio structure of the partial shell-type SNR G343.1-2.3.
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Submitted on : Monday, February 7, 2011 - 3:48:15 PM
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A. Abramowski, Fabio Acero, F. Aharonian, A.G. Akhperjanian, G. Anton, et al.. Detection of very-high-energy gamma-ray emission from the vicinity of PSR B1706-44 and G343.1-2.3 with H.E.S.S. Astronomy and Astrophysics - A&A, EDP Sciences, 2011, 528, pp.A143. ⟨10.1051/0004-6361/201015381⟩. ⟨in2p3-00563803⟩

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