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Title: HESS upper limits for Kepler's supernova remnant
Authors: Aharonian, F.
Benbow, W.
Berge, D.
Bernlöhr, K.
Bolz, O.
Braun, I.
Bühler, R.
Carrigan, S.
Clapson, A. C.
Costamante, L.
Domainko, W.
Van Eldik C
Völk, H. J.
Akhperjanian, A. G.
Sahakian, V.
Lohse, T.
Bazer-Bachi, A. R.
Borrel, V.
Olive, J. -. P.
Chadwick, P. M.
Beilicke, M.
Khélifi, B.
Cornils, R.
Heinzelmann, G.
Horns, D.
Ripken, J.
Bernlöhr, K.
Dickinson, H. J.
Schwanke, U.
Boisson, C.
Lenain, J. -. P.
Martin, J. M.
Lemoine-Goumard, M.
Sol, H.
Pita, S.
Zech, A.
Brion, E.
Glicenstein, J. F.
Goret, P.
Moulin, E.
Hadjichristidis, C.
Keogh, D.
Latham, I. J.
Naumann-Godo, M.
McComb, T. J. L.
Nolan, S. J.
Punch, M.
Orford, K. J.
Wagner, S. J.
Osborne, J. L.
Rayner, S. M.
Spangler, D.
Ward, M.
Büsching, I.
Superina, G.
Holleran, M.
De Jager OC
Raubenheimer, B. C.
Terrier, R.
Venter, C.
Chounet, L. -. M.
Farnier, C.
Degrange, B.
Fontaine, G.
Giebels, B.
Aharonian, F.
Volpe, F.
Coignet, G.
Dubois, F.
Feinstein, F.
Lamanna, G.
Martineau-Huynh, O.
Rosier-Lees, S.
Vialle, J. P.
Djannati-Ataï, A.
Espigat, P.
De Oña Wilhelmi E
Fiasson, A.
Drury, L. O. '.
Masterson, C.
Behera, B.
Emmanoulopoulos, D.
Maurin, D.
Hauser, M.
Stawarz, Ł.
Pedaletti, G.
Pühlhofer, G.
Quirrenbach, A.
Schwemmer, S.
Tam, P. H.
Gallant, Y. A.
Jacholkowska, A.
Komin, N.
De Naurois M
Marcowith, A.
Vasileiadis, G.
Bulik, T.
Brucker, J.
Egberts, K.
Glück, B.
Jung, I.
Schöck, F. M.
Stegmann, C.
Boutelier, T.
Tavernet, J. -. P.
Dubus, G.
Henri, G.
Pelletier, G.
Dyks, J.
Petrucci, P. -. O.
Hoffmann, A.
Förster, A.
Kendziorra, E.
Santangelo, A.
Schwarzburg, S.
Moderski, R.
Vincent, P.
Nedbal, D.
Rob, L.
Hauser, D.
Ruppel, J.
Dalton, M.
Schlickeiser, R.
Schröder, R.
Shalchi, A.
Steenkamp, R.
Ostrowski, M.
Hermann, G.
Rudak, B.
Zdziarski, A. A.
Hinton, J. A.
Rowell, G.
Füßling, M.
Katarzyński, K.
Vivier, M.
Costamante, L.
Volpe, F.
Barres De Almeida U
Berge, D.
Lemoine-Goumard, M.
Hofmann, W.
Hoppe, S.
Kosack, K.
Kerschhaggl, M.
Nekrassov, D.
Ohm, S.
Barres De Almeida U
Panter, M.
Raue, M.
Renaud, M.
First Published: Sep-2008
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2008, 488 (1), pp. 219-223
Abstract: Aims. Observations of Kepler's supernova remnant (G4.5+6.8) with the HESS telescope array in 2004 and 2005 with a total live time of 13 h are presented. Methods. Stereoscopic imaging of Cherenkov radiation from extensive air showers is used to reconstruct the energy and direction of the incident gamma rays. Results. No evidence for a very high energy (VHE: >100 GeV) gamma-ray signal from the direction of the remnant is found. An upper limit (99% confidence level) on the energy flux in the range $230~{\rm GeV}{-}12.8~{\rm TeV}$ of 8.6 $\times$ $10^{-13}~{\rm erg}~{\rm cm}^{-2}~{\rm s}^{-1}$ is obtained. Conclusions. In the context of an existing theoretical model for the remnant, the lack of a detectable gamma-ray flux implies a distance of at least $6.4~{\rm kpc}$. A corresponding upper limit for the density of the ambient matter of $0.7~{\rm cm}^{-3}$ is derived. With this distance limit, and assuming a spectral index $\Gamma = 2$, the total energy in accelerated protons is limited to $E_{\rm p} < 8.6$ $\times$ $10^{49}~{\rm erg}$. In the synchrotron/inverse Compton framework, extrapolating the power law measured by RXTE between 10 and $20~{\rm keV}$ down in energy, the predicted gamma-ray flux from inverse Compton scattering is below the measured upper limit for magnetic field values greater than $52~\mu {\rm G}$.
DOI Link: 10.1051/0004-6361:200809401
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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