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Spectrum and variab...
Spectrum and variability of the Galactic center VHE gamma-ray source HESS J1745-290
- Article/chapterEnglish2009
Publisher, publication year, extent ...
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2009-07-02
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EDP Sciences,2009
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:lnu-30260
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https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-30260URI
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https://doi.org/10.1051/0004-6361/200811569DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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Aims. A detailed study of the spectrum and variability of the source HESS J1745-290 in the Galactic Center (GC) region using new data from the H. E. S. S. array of Cherenkov telescopes is presented. Flaring activity and quasi periodic oscillations (QPO) of HESS J1745-290 are investigated. Methods. The image analysis is performed with a combination of a semi-analytical shower model and the statistical moment-based Hillas technique. The spectrum and lightcurves of HESS J1745-290 are derived with a likelihood method based on a spectral shape hypothesis. Rayleigh tests and Fourier analysis of the H. E. S. S. GC signal are used to study the periodicity of the source. Results. With a three-fold increase in statistics compared to previous work, a deviation from a simple power law spectrum is detected for the first time. The measured energy spectrum over the three years 2004, 2005 and 2006 of data taking is compatible with both a power law spectrum with an exponential cut-off and a broken power law spectrum. The curvature of the energy spectrum is likely to be intrinsic to the photon source, as opposed to effects of interstellar absorption. The power law spectrum with an exponential cut-off is characterized by a photon index of 2.10 +/- 0.04(stat) +/- 0.10(syst) and a cut-off energy at 15.7 +/- 3.4(stat) +/- 2.5(syst) TeV. The broken power law spectrum exhibits spectral indices of 2.02 +/- 0.08(stat) +/- 0.10(syst) and 2.63 +/- 0.14(stat) +/- 0.10(syst) with a break energy at 2.57 +/- 0.19(stat) +/- 0.44(syst) TeV. No significant flux variation is found. Increases in the gamma-ray flux of HESS J1745-290 by at least a factor of two would be required for a 3 sigma detection of a flare with time scales of an hour. Investigation of possible QPO activity at periods claimed to be detected in X-rays does not show any periodicities in the H. E. S. S. signal.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Akhperjanian, A. G.
(author)
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Anton, G.
(author)
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de Almeida, U. Barres
(author)
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Bazer-Bachi, A. R.
(author)
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Becherini, Yvonne
(author)
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Behera, B.
(author)
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Bernloehr, K.
(author)
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Boisson, C.
(author)
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Bochow, A.
(author)
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Borrel, V.
(author)
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Braun, I.
(author)
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Brion, E.
(author)
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Brucker, J.
(author)
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Brun, P.
(author)
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Buehler, R.
(author)
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Bulik, T.
(author)
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Buesching, I.
(author)
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Boutelier, T.
(author)
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Chadwick, P. M.
(author)
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Charbonnier, A.
(author)
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Chaves, R. C. G.
(author)
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Cheesebrough, A.
(author)
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Chounet, L. -M
(author)
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Clapson, A. C.
(author)
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Coignet, G.
(author)
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Dalton, M.
(author)
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Daniel, M. K.
(author)
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Davids, I. D.
(author)
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Degrange, B.
(author)
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Deil, C.
(author)
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Dickinson, H. J.
(author)
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Djannati-Atai, A.
(author)
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Domainko, W.
(author)
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Drury, L. O 'C.
(author)
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Dubois, F.
(author)
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Dubus, G.
(author)
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Dyks, J.
(author)
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Dyrda, M.
(author)
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Egberts, K.
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Emmanoulopoulos, D.
(author)
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Espigat, P.
(author)
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Farnier, C.
(author)
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Feinstein, F.
(author)
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Fiasson, A.
(author)
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Foerster, A.
(author)
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Fontaine, G.
(author)
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Fuessling, M.
(author)
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Gabici, S.
(author)
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Gallant, Y. A.
(author)
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Gerard, L.
(author)
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Giebels, B.
(author)
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Glicenstein, J. F.
(author)
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Glueck, B.
(author)
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Goret, P.
(author)
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Hauser, D.
(author)
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Hauser, M.
(author)
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Heinz, S.
(author)
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Heinzelmann, G.
(author)
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Henri, G.
(author)
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Hermann, G.
(author)
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Hinton, J. A.
(author)
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Hoffmann, A.
(author)
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Hofmann, W.
(author)
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Holleran, M.
(author)
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Hoppe, S.
(author)
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Horns, D.
(author)
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Jacholkowska, A.
(author)
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de Jager, O. C.
(author)
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Jung, I.
(author)
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Katarzynski, K.
(author)
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Katz, U.
(author)
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Kaufmann, S.
(author)
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Kendziorra, E.
(author)
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Kerschhaggl, M.
(author)
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Khangulyan, D.
(author)
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Khelifi, B.
(author)
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Keogh, D.
(author)
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Komin, Nu.
(author)
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Kosack, K.
(author)
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Lamanna, G.
(author)
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Lenain, J. -P
(author)
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Lohse, T.
(author)
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Marandon, V.
(author)
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Martin, J. M.
(author)
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Martineau-Huynh, O.
(author)
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Marcowith, A.
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Maurin, D.
(author)
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McComb, T. J. L.
(author)
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Medina, M. C.
(author)
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Moderski, R.
(author)
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Moulin, E.
(author)
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Naumann-Godo, M.
(author)
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de Naurois, M.
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Nedbal, D.
(author)
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Nekrassov, D.
(author)
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Niemiec, J.
(author)
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Nolan, S. J.
(author)
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Ohm, S.
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Olive, J. -F
(author)
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Wilhelmi, E. de Ona
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Orford, K. J.
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Ostrowski, M.
(author)
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Panter, M.
(author)
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Arribas, M. Paz
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Pedaletti, G.
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Pelletier, G.
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Petrucci, P. -O
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Pita, S.
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Puehlhofer, G.
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Punch, M.Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France(Swepub:lnu)mipuaa
(author)
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Quirrenbach, A.
(author)
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Raubenheimer, B. C.
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Raue, M.
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Rayner, S. M.
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Renaud, M.
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Rieger, F.
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Ripken, J.
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Rob, L.
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Rolland, L.
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Rosier-Lees, S.
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Rowell, G.
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Rudak, B.
(author)
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Rulten, C. B.
(author)
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Ruppel, J.
(author)
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Sahakian, V.
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Santangelo, A.
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Schlickeiser, R.
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Schoeck, F. M.
(author)
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Schroeder, R.
(author)
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Schwanke, U.
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Schwarzburg, S.
(author)
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Schwemmer, S.
(author)
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Shalchi, A.
(author)
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Skilton, J. L.
(author)
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Sol, H.
(author)
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Spangler, D.
(author)
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Stawarz, L.
(author)
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Steenkamp, R.
(author)
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Stegmann, C.
(author)
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Superina, G.
(author)
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Szostek, A.
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Tam, P. H.
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Tavernet, J. -P
(author)
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Terrier, R.
(author)
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Tibolla, O.
(author)
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van Eldik, C.
(author)
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Vasileiadis, G.
(author)
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Venter, C.
(author)
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Venter, L.
(author)
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Vialle, J. P.
(author)
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Vincent, P.
(author)
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Vivier, M.
(author)
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Voelk, H. J.
(author)
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Volpe, F.
(author)
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Wagner, S. J.
(author)
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Ward, M.
(author)
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Zdziarski, A. A.
(author)
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Zech, A.
(author)
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Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences503:3, s. 817-8250004-63611432-0746
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Aharonian, F.
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Akhperjanian, A. ...
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de Almeida, U. B ...
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Bazer-Bachi, A. ...
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Behera, B.
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Bernloehr, K.
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Boisson, C.
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Bochow, A.
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Borrel, V.
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Braun, I.
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Brion, E.
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Brucker, J.
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Brun, P.
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Buehler, R.
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Bulik, T.
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Buesching, I.
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Boutelier, T.
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Chadwick, P. M.
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Charbonnier, A.
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Chaves, R. C. G.
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Cheesebrough, A.
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Chounet, L. -M
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Clapson, A. C.
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Coignet, G.
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Dalton, M.
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Daniel, M. K.
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Davids, I. D.
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Degrange, B.
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Deil, C.
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Dickinson, H. J.
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Djannati-Atai, A ...
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Domainko, W.
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Drury, L. O 'C.
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Dubois, F.
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Dubus, G.
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Dyks, J.
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Dyrda, M.
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Egberts, K.
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Emmanoulopoulos, ...
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Espigat, P.
-
Farnier, C.
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Feinstein, F.
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Fiasson, A.
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Foerster, A.
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Fontaine, G.
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Fuessling, M.
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Gabici, S.
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Gallant, Y. A.
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Gerard, L.
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Giebels, B.
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Glicenstein, J. ...
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Glueck, B.
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Goret, P.
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Hauser, D.
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Hauser, M.
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Heinz, S.
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Heinzelmann, G.
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Henri, G.
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Hermann, G.
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Hinton, J. A.
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Hoffmann, A.
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Hofmann, W.
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Holleran, M.
-
Hoppe, S.
-
Horns, D.
-
Jacholkowska, A.
-
de Jager, O. C.
-
Jung, I.
-
Katarzynski, K.
-
Katz, U.
-
Kaufmann, S.
-
Kendziorra, E.
-
Kerschhaggl, M.
-
Khangulyan, D.
-
Khelifi, B.
-
Keogh, D.
-
Komin, Nu.
-
Kosack, K.
-
Lamanna, G.
-
Lenain, J. -P
-
Lohse, T.
-
Marandon, V.
-
Martin, J. M.
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Martineau-Huynh, ...
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Marcowith, A.
-
Maurin, D.
-
McComb, T. J. L.
-
Medina, M. C.
-
Moderski, R.
-
Moulin, E.
-
Naumann-Godo, M.
-
de Naurois, M.
-
Nedbal, D.
-
Nekrassov, D.
-
Niemiec, J.
-
Nolan, S. J.
-
Ohm, S.
-
Olive, J. -F
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Wilhelmi, E. de ...
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Orford, K. J.
-
Ostrowski, M.
-
Panter, M.
-
Arribas, M. Paz
-
Pedaletti, G.
-
Pelletier, G.
-
Petrucci, P. -O
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Pita, S.
-
Puehlhofer, G.
-
Punch, M.
-
Quirrenbach, A.
-
Raubenheimer, B. ...
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Raue, M.
-
Rayner, S. M.
-
Renaud, M.
-
Rieger, F.
-
Ripken, J.
-
Rob, L.
-
Rolland, L.
-
Rosier-Lees, S.
-
Rowell, G.
-
Rudak, B.
-
Rulten, C. B.
-
Ruppel, J.
-
Sahakian, V.
-
Santangelo, A.
-
Schlickeiser, R.
-
Schoeck, F. M.
-
Schroeder, R.
-
Schwanke, U.
-
Schwarzburg, S.
-
Schwemmer, S.
-
Shalchi, A.
-
Skilton, J. L.
-
Sol, H.
-
Spangler, D.
-
Stawarz, L.
-
Steenkamp, R.
-
Stegmann, C.
-
Superina, G.
-
Szostek, A.
-
Tam, P. H.
-
Tavernet, J. -P
-
Terrier, R.
-
Tibolla, O.
-
van Eldik, C.
-
Vasileiadis, G.
-
Venter, C.
-
Venter, L.
-
Vialle, J. P.
-
Vincent, P.
-
Vivier, M.
-
Voelk, H. J.
-
Volpe, F.
-
Wagner, S. J.
-
Ward, M.
-
Zdziarski, A. A.
-
Zech, A.
-
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