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HESS very-high-energy gamma-ray sources without identified counterparts

F. Aharonian A.G. Akhperjanian U. Barres de Almeida A.R. Bazer-Bachi 1 B. Behera M. Beilicke W. Benbow K. Bernlöhr C. Boisson 2 O. Bolz V. Borrel 1 I. Braun E. Brion 3 A.M. Brown R. Bühler T. Bulik I. Büsching T. Boutelier 4 S. Carrigan P.M. Chadwick L.-M. Chounet 5 A.C. Clapson G. Coignet 6 R. Cornils L. Costamante M. Dalton B. Degrange 5 H.J. Dickinson A. Djannati-Ataï 7 W. Domainko L.O'C. Drury F. Dubois 6 G. Dubus 4 J. Dyks K. Egberts D. Emmanoulopoulos P. Espigat 8 C. Farnier 9 F. Feinstein 9 A. Fiasson 9 A. Förster G. Fontaine 5 Seb. Funk M. Füßling Y.A. Gallant 9 B. Giebels 5 J.F. Glicenstein 3 B. Glück P. Goret 3 C. Hadjichristidis D. Hauser M. Hauser G. Heinzelmann G. Henri 4 G. Hermann J.A. Hinton A. Hoffmann W. Hofmann M. Holleran S. Hoppe D. Horns A. Jacholkowska 9 O.C. de Jager I. Jung K. Katarzynski E. Kendziorra M. Kerschhaggl B. Khélifi 5 D. Keogh Nu. Komin 9 K. Kosack G. Lamanna 6 I. J. Latham A. Lemière 8 M. Lemoine-Goumard 5 J.-P. Lenain 2 T. Lohse J. M. Martin 2 O. Martineau-Huynh 10 A. Marcowith 9 C. Masterson D. Maurin 10 G. Maurin 8 T. J. L.Mccomb R. Moderski Emmanuel Moulin 3 M. de Naurois 10 D. Nedbal S.J. Nolan S. Ohm J.-P. Olive 1 E. de Oña Wilhelmi 8 K.J. Orford J.L. Osborne M. Ostrowski M. Panter G. Pedaletti G. Pelletier 4 P.-O. Petrucci 4 S. Pita 8 G. Pühlhofer M. Punch 8 S. Ranchon 6 B.C. Raubenheimer M. Raue S.M. Rayner M. Renaud J. Ripken L. Rob L. Rolland 3 S. Rosier-Lees 6 G. Rowell B. Rudak J. Ruppel V. Sahakian A. Santangelo R. Schlickeiser F. Schöck R. Schröder U. Schwanke S. Schwarzburg S. Schwemmer A. Shalchi H. Sol 2 D. Spangler L. Stawarz R. Steenkamp C. Stegmann G. Superina 5 P.H. Tam J.-P. Tavernet 10 R. Terrier 8 C. van Eldik G. Vasileiadis 9 C. Venter J.P. Vialle 6 P. Vincent 10 M. Vivier 3 H.J. Völk F. Volpe 5 S.J. Wagner A.A. Zdziarski A. Zech 2
Abstract : Context.The detection of gamma rays in the very-high-energy (VHE) energy range (100 GeV-100 TeV) provides a direct view of the parent population of ultra-relativistic particles found in astrophysical sources. For this reason, VHE gamma rays are useful for understanding the underlying astrophysical processes in non-thermal sources. Aims.We investigate unidentified VHE gamma-ray sources that have been discovered with HESS in the most sensitive blind survey of the Galactic plane at VHE energies conducted so far. Methods.The HESS array of imaging atmospheric Cherenkov telescopes (IACTs) has a high sensitivity compared with previous instruments (~ in 25 h observation time for a point-source detection), and with its large field of view, is well suited for scan-based observations. The on-going HESS survey of the inner Galaxy has revealed a large number of new VHE sources, and for each we attempt to associate the VHE emission with multi-wavelength data in the radio through X-ray wavebands. Results. For each of the eight unidentified VHE sources considered here, we present the energy spectra and sky maps of the sources and their environment. The VHE morphology is compared with available multi-wavelength data (mainly radio and X-rays). No plausible counterparts are found.
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Submitted on : Thursday, December 13, 2007 - 2:55:30 PM
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F. Aharonian, A.G. Akhperjanian, U. Barres de Almeida, A.R. Bazer-Bachi, B. Behera, et al.. HESS very-high-energy gamma-ray sources without identified counterparts. Astronomy and Astrophysics - A&A, EDP Sciences, 2008, 477, pp.353-363. ⟨10.1051/0004-6361:20078516⟩. ⟨in2p3-00196769⟩

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