Extended VHE γ-ray emission towards SGR1806-20, LBV 1806-20, and stellar cluster Cl* 1806-20

Journal
Date Issued
2018
Author(s)
H. E. S. S. Collaboration
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Abdalla, H.
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Abramowski, A.
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Aharonian, F.
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Ait Benkhali, F.
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Akhperjanian, A. G.
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Angüner, E. O.
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Arrieta, M.
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Aubert, P.
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Backes, M.
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Balzer, A.
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Barnard, M.
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Becherini, Y.
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Becker Tjus, J.
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Berge, D.
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Bernhard, S.
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Bernlöhr, K.
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Birsin, E.
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Blackwell, R.
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Böttcher, M.
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Boisson, C.
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Bolmont, J.
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Bordas, P.
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Bregeon, J.
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Brun, F.
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Brun, P.
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Bryan, M.
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Bulik, T.
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Capasso, M.
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Carr, J.
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Casanova, S.
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Chakraborty, N.
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Chalme-Calvet, R.
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Chaves, R. C. G.
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Chen, A.
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Chevalier, J.
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Chrétien, M.
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Colafrancesco, S.
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Cologna, G.
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Condon, B.
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Conrad, J.
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Couturier, C.
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Cui, Y.
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Davids, I. D.
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Degrange, B.
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Deil, C.
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deWilt, P.
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Djannati-Ataï, A.
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Domainko, W.
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Donath, A.
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Drury, L. O. 'C.
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Dubus, G.
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Dutson, K.
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Dyks, J.
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Dyrda, M.
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Edwards, T.
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Egberts, K.
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Eger, P.
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Ernenwein, J. -P.
•
Eschbach, S.
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Farnier, C.
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Fegan, S.
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Fernandes, M. V.
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Fiasson, A.
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Fontaine, G.
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Förster, A.
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Funk, S.
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Füßling, M.
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Gabici, S.
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Gajdus, M.
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Gallant, Y. A.
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Garrigoux, T.
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Giavitto, G.
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Giebels, B.
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Glicenstein, J. F.
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Gottschall, D.
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Goyal, A.
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Grondin, M. -H.
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Grudzińska, M.
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Hadasch, D.
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Hahn, J.
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Hawkes, J.
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Heinzelmann, G.
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Henri, G.
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Hermann, G.
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Hervet, O.
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Hillert, A.
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Hinton, J. A.
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Hofmann, W.
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Hoischen, C.
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Holler, M.
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Horns, D.
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Ivascenko, A.
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Jacholkowska, A.
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Jamrozy, M.
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Janiak, M.
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Jankowsky, D.
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Jankowsky, F.
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Jingo, M.
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Jogler, T.
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Jouvin, L.
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Jung-Richardt, I.
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Kastendieck, M. A.
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Katarzyński, K.
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Katz, U.
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Kerszberg, D.
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Khélifi, B.
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Kieffer, M.
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King, J.
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Klepser, S.
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Klochkov, D.
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Kluźniak, W.
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Kolitzus, D.
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Komin, Nu.
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Kosack, K.
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Krakau, S.
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Kraus, M.
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Krayzel, F.
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Krüger, P. P.
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Laffon, H.
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Lamanna, G.
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Lau, J.
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Lees, J. -P.
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Lefaucheur, J.
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Lefranc, V.
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Lemière, A.
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Lemoine-Goumard, M.
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Lenain, J. -P.
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Leser, E.
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Lohse, T.
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Lorentz, M.
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Liu, R.
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Lypova, I.
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Marandon, V.
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Marcowith, A.
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Mariaud, C.
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Marx, R.
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Maurin, G.
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Maxted, N.
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Mayer, M.
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Meintjes, P. J.
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Menzler, U.
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Meyer, M.
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Mitchell, A. M. W.
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Moderski, R.
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Mohamed, M.
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Morå, K.
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Moulin, E.
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Murach, T.
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de Naurois, M.
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Niederwanger, F.
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Niemiec, J.
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Oakes, L.
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Odaka, H.
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Öttl, S.
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Ohm, S.
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Ostrowski, M.
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Oya, I.
•
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Panter, M.
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Parsons, R. D.
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Paz Arribas, M.
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Pekeur, N. W.
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Pelletier, G.
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Petrucci, P. -O.
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Peyaud, B.
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Pita, S.
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Poon, H.
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Prokhorov, D.
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Prokoph, H.
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Pühlhofer, G.
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Punch, M.
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Quirrenbach, A.
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Raab, S.
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Reimer, A.
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Reimer, O.
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Renaud, M.
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de Reyes, R.
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Rieger, F.
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Romoli, C.
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Rosier-Lees, S.
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Rowell, G.
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Rudak, B.
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Rulten, C. B.
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Sahakian, V.
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Salek, D.
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Sanchez, D. A.
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Santangelo, A.
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Sasaki, M.
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Schlickeiser, R.
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Schüssler, F.
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Schulz, A.
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Schwanke, U.
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Schwemmer, S.
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Seyffert, A. S.
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Shafi, N.
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Shilon, I.
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Simoni, R.
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Sol, H.
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Spanier, F.
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Spengler, G.
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Spies, F.
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Stawarz, Ł.
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Steenkamp, R.
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Stegmann, C.
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Stinzing, F.
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Stycz, K.
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Sushch, I.
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Tavernet, J. -P.
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Tavernier, T.
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Taylor, A. M.
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Terrier, R.
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Tluczykont, M.
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Trichard, C.
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Tuffs, R.
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van der Walt, J.
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van Eldik, C.
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van Soelen, B.
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Vasileiadis, G.
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Veh, J.
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Venter, C.
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Viana, A.
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Vincent, P.
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Vink, J.
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Voisin, F.
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Völk, H. J.
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Vuillaume, T.
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Wadiasingh, Z.
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Wagner, S. J.
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Wagner, P.
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Wagner, R. M.
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White, R.
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Wierzcholska, A.
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Willmann, P.
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Wörnlein, A.
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Wouters, D.
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Yang, R.
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Zabalza, V.
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Zaborov, D.
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Zacharias, M.
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Zdziarski, A. A.
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Zech, A.
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Zefi, F.
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Ziegler, A.
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Żywucka, N.
DOI
Abstract
Using the High Energy Spectroscopic System (H.E.S.S.) telescopes we have discovered a steady and extended very high-energy (VHE) γ-ray source towards the luminous blue variable candidate LBV 1806-20, massive stellar cluster Cl* 1806-20, and magnetar SGR 1806-20. The new VHE source, HESS J1808-204, was detected at a statistical significance of >6σ (post-trial) with a photon flux normalisation (2.9 ± 0.4stat ± 0.5sys) × 10-13 ph cm-2 s-1 TeV-1 at 1 TeV and a power-law photon index of 2.3 ± 0.2stat ± 0.3sys. The luminosity of this source (0.2 to 10 TeV; scaled to distance d = 8.7 kpc) is LVHE 1.6 × 1034(d/8.7 kpc)2 erg s-1. The VHE γ-ray emission is extended and is well fit by a single Gaussian with statistical standard deviation of 0.095° ± 0.015°. This extension is similar to that of the synchrotron radio nebula G10.0-0.3, which is thought to be powered by LBV 1806-20. The VHE γ-ray luminosity could be provided by the stellar wind luminosity of LBV 1806-20 by itself and/or the massive star members of Cl* 1806-20. Alternatively, magnetic dissipation (e.g. via reconnection) from SGR 1806-20 can potentially account for the VHE luminosity. The origin and hadronic and/or leptonic nature of the accelerated particles responsible for HESS J1808-204 is not yet clear. If associated with SGR 1806-20, the potentially young age of the magnetar (650 yr) can be used to infer the transport limits of these particles to match the VHE source size. This discovery provides new interest in the potential for high-energy particle acceleration from magnetars, massive stars, and/or stellar clusters.
Volume
612
Start page
A11
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2018A&A...612A..11H
Rights
open.access
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