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Title: HESS very-high-energy gamma-ray sources without identified counterparts
Authors: Aharonian, F.
Benbow, W.
Bernlöhr, K.
Bolz, O.
Braun, I.
Bühler, R.
Carrigan, S.
Clapson, A. C.
Costamante, L.
Domainko, W.
Egberts, K.
Martineau-Huynh, O.
Schröder, R.
Maurin, D.
De Naurois M
Tavernet, J. -. P.
Vincent, P.
Nedbal, D.
Hermann, G.
Rob, L.
Shalchi, A.
Lohse, T.
Steenkamp, R.
Ostrowski, M.
Stawarz, L.
Bulik, T.
Zdziarski, A. A.
Glicenstein, J. F.
Hinton, J. A.
Rowell, G.
Katarzyński, K.
Costamante, L.
Moulin, E.
Hoppe, S.
Dickinson, H. J.
Kosack, K.
Ohm, S.
Panter, M.
Renaud, M.
Latham, J.
Van Eldik C
Volk, H. J.
Akhperjanian, A. G.
Schwanke, U.
Sahakian, V.
Bazer-Bachi, A. R.
Borrel, V.
Hadjichristidis, C.
Olive, J. -. P.
Beilicke, M.
Cornus, R.
Goret, P.
Heinzelmann, G.
Raue, M.
Boisson, C.
Ripken, J.
Bernlöhr, K.
Dalton, M.
Funk, S.
Füßling, M.
Keogh, D.
Kerschhaggl, M.
Lenain, J. -. P.
Martin, J. M.
Sol, H.
Zech, A.
Brion, E.
Rolland, L.
Espigat, P.
Vivier, M.
De Almeida UB
Brown, A. M.
Chadwick, P. M.
McComb, T. J. L.
Drury, L. O. C.
Nolan, S. J.
Orford, K. J.
Osborne, J. L.
Rayner, S. M.
Behera, B.
Spangler, D.
Tam, P. H.
Ward, M.
Büsching, I.
Holleran, M.
De Jager OC
Feinstein, F.
Raubenheimer, B. C.
Venter, C.
Chounet, L. -. M.
Lemière, A.
Degrange, B.
Fontaine, G.
Giebels, B.
Wagner, S. J.
Khélifi, B.
Lemoine-Goumard, M.
Superina, G.
Masterson, C.
Volpe, F.
Coignet, G.
Maurin, G.
Dubois, F.
Lamanna, G.
Ranchon, S.
Rosier-Lees, S.
Vialle, J. P.
Farnier, C.
Djannati-Ataï, A.
De Oña Wilhelmi E
Pita, S.
Punch, M.
Terrier, R.
Aharonian, F.
Emmanoulopoulos, D.
Ruppel, J.
Hauser, M.
Pedaletti, G.
Pühlhofer, G.
Schwemmer, S.
Fiasson, A.
Dyks, J.
Gallant, Y. A.
Jacholkowska, A.
Komin, N.
Marcowith, A.
Rudak, B.
Vasileiadis, G.
Förster, A.
Glück, B.
Jung, L.
Schöck, F.
Stegmann, C.
Hofmann, W.
Boutelier, T.
Dubus, G.
Henri, G.
Schlickeiser, R.
Pelletier, G.
Petrucci, P. -. O.
Hoffmann, A.
Hauser, D.
Horns, D.
Kendziorra, E.
Santangelo, A.
Moderski, R.
Schwarzburg, S.
First Published: Jan-2008
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2008, 477 (1), pp. 353-363
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 (~ $0.01\:\mathrm{Crab}$ in 25 h observation time for a $5\sigma$ 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.
DOI Link: 10.1051/0004-6361:20078516
ISSN: 0004-6361
eISSN: 1432-0746
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2008 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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