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Title: HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae
Authors: Abramowski, A.
Acero, F.
Aharonian, F.
Akhperjanian, A. G.
Anton, G.
Balzer, A.
Barnacka, A.
Becherini, Y.
Becker, J.
Bernloehr, K.
Birsin, E.
Steenkamp, R.
van Eldik C.
Reimer, O.
Renaud, M.
de los Reyes R.
Rieger, F.
Ripken, J.
Rob, L.
Rosier-Lees, S.
Schwanke, U.
Jamrozy, M.
Rowell, G.
Rudak, B.
Stegmann, C.
Bordas, P.
Stinzing, F.
Kossakowski, R.
Schwarzburg, S.
Schwemmer, S.
Venter, C.
Sheidaei, F.
Kosack, K.
Viana, A.
Maxted, N.
Stycz, K.
Sushch, I.
Zajczyk, A.
Szostek, A.
Maurin, G.
Zdziarski, A. A.
Khelifi, B.
Vincent, P.
Gast, H.
Voelk, H. J.
Brun, P.
Volpe, F.
Hofverberg, P.
Bulik, T.
Lopatin, A.
Zech, A.
Hampf, D.
Zechlin, H-S.
Montmerle, T.
Gerard, L.
Collaboration, HESS
Klochkov, D.
Buesching, I.
Carrigan, S.
Casanova, S.
Holler, M.
Cerruti, M.
Chadwick, P. M.
Harris, J.
Charbonnier, A.
Giebels, B.
Lu, C-C.
Chaves, R. C. G.
Cheesebrough, A.
Cologna, G.
Kluzniak, W.
Conrad, J.
Dalton, M.
Horns, D.
Daniel, M. K.
Hauser, M.
Glicenstein, J. F.
Davids, I. D.
Degrange, B.
Deil, C.
Dickinson, H. J.
Marandon, V.
Djannati-Atai, A.
Domainko, W.
Kneiske, T.
Drury, L. O.
Jacholkowska, A.
Glueck, B.
Heinz, S.
Dubus, G.
Dutson, K.
Dyks, J.
Dyrda, M.
Egberts, K.
Eger, P.
Espigat, P.
Marcowith, A.
Fallon, L.
Goering, D.
Komin, N.
Heinzelmann, G.
Jahn, C.
Fegan, S.
Feinstein, F.
Fernandes, M. V.
Fiasson, A.
Fontaine, G.
Foerster, A.
Fuessling, M.
Grondin, M-H.
Gallant, Y. A.
Garrigoux, T.
Henri, G.
Masbou, J.
Hermann, G.
Vasileiadis, G.
Haeffner, S.
Hague, J. D.
Jung, I.
Hahn, J.
Kastendieck, M. A.
Zacharias, M.
Hillert, A.
Hinton, J. A.
Krayzel, F.
Hofmann, W.
Wierzcholska, A.
Laffon, H.
Brun, F.
Katarzynski, K.
Katz, U.
Mayer, M.
Kaufmann, S.
Brucker, J.
McComb, T. J. L.
Vorobiov, S.
Lamanna, G.
Rulten, C. B.
Lenain, J-P.
Lennarz, D.
Lohse, T.
Tavernet, J-P.
Medina, M. C.
Biteau, J.
Mehault, J.
Skilton, J. L.
Moderski, R.
Mohamed, M.
Sahakian, V.
Moulin, E.
Vorster, M.
Naumann, C. L.
Naumann-Godo, M.
de Naurois M.
Terrier, R.
Nedbal, D.
Nekrassov, D.
Sol, H.
Nguyen, N.
Sanchez, D. A.
Bochow, A.
Nicholas, B.
Niemiec, J.
Nolan, S. J.
Wagner, S. J.
Ohm, S.
Wilhelmi, E. D. O.
Tluczykont, M.
Opitz, B.
Spengler, G.
Santangelo, A.
Ostrowski, M.
Oya, I.
Panter, M.
Arribas, M. P.
Boisson, C.
Pekeur, N. W.
Pelletier, G.
Ward, M.
Perez, J.
Valerius, K.
Schlickeiser, R.
Stawarz, L.
Petrucci, P-O.
Peyaud, B.
Pita, S.
Puehlhofer, G.
Punch, M.
Quirrenbach, A.
Raue, M.
Bolmont, J.
Reimer, A.
Schulz, A.
White, R.
First Published: 21-Jul-2012
Citation: Monthly Notices of the Royal Astronomical Society , 2012, 424 (1), pp. 128-135
Abstract: The massive binary system Eta Carinae and the surrounding H ii complex, the Carina nebula, are potential particle acceleration sites from which very high energy (VHE; E≥ 100 GeV) γ-ray emission could be expected. This paper presents data collected during VHE γ-ray observations with the HESS telescope array from 2004 to 2010, which cover a full orbit of Eta Carinae. In the 33.1-h data set no hint of significant γ-ray emission from Eta Carinae has been found and an upper limit on the γ-ray flux of 7.7 x 10 [Superscript: -13] ph cm[Superscript: -2] s[Superscript: -1] (99 per cent confidence level) is derived above the energy threshold of 470 GeV. Together with the detection of high energy (HE; 0.1 ≤E≤ 100 GeV) γ-ray emission by the Fermi Large Area Telescope up to 100 GeV, and assuming a continuation of the average HE spectral index into the VHE domain, these results imply a cut-off in the γ-ray spectrum between the HE and VHE γ-ray range. This could be caused either by a cut-off in the accelerated particle distribution or by severe γ–γ absorption losses in the wind collision region. Furthermore, the search for extended γ-ray emission from the Carina nebula resulted in an upper limit on the γ-ray flux of 4.2 x 10 [Superscript: -12] ph cm[Superscript: -2] s[Superscript: -1] (99 per cent confidence level). The derived upper limit of ∼23 on the cosmic ray enhancement factor is compared with results found for the old-age mixed-morphology supernova remnant W28.
DOI Link: 10.1111/j.1365-2966.2012.21180.x
ISSN: 0035-8711
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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