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PKS 2005-489 at VHE: Four Years of Monitoring with HESS and Simultaneous Multi-wavelength Observations

Fabio Acero F. Aharonian A.G. Akhperjanian G. Anton U. Barres de Almeida A.R. Bazer-Bachi 1 Y. Becherini 2 B. Behera W. Benbow K. Bernlöhr A. Bochow C. Boisson 3 J. Bolmont 4 V. Borrel 1 J. Brucker F. Brun 4 P. Brun 5 R. Bühler T. Bulik I. Büsching T. Boutelier 6 P.M. Chadwick A. Charbonnier 4 R.C.G. Chaves A. Cheesebrough L.-M. Chounet 7 A.C. Clapson G. Coignet 8 L. Costamante M. Dalton M.K. Daniel I.D. Davids B. Degrange 7 C. Deil H.J. Dickinson A. Djannati-Ataï 9 W. Domainko L.O'C. Drury F. Dubois 8 G. Dubus 6 J. Dyks M. Dyrda K. Egberts P. Eger P. Espigat 2 L. Fallon C. Farnier 10 S. Fegan F. Feinstein 10 A. Fiasson 8 A. Förster G. Fontaine 7 M. Füßling S. Gabici Y.A. Gallant 10 L. Gérard 2 D. Gerbig B. Giebels 7 J.F. Glicenstein 5 B. Glück P. Goret 5 D. Göring M. Hauser S. Heinz G. Heinzelmann G. Henri 6 G. Hermann J.A. Hinton A. Hoffmann W. Hofmann P. Hofverberg M. Holleran S. Hoppe D. Horns A. Jacholkowska 10 O.C. de Jager C. Jahn I. Jung K. Katarzynski U. Katz S. Kaufmann M. Kerschhaggl D. Khangulyan B. Khélifi 7 D. Keogh D. Klochkov W. Kluzniak T. Kneiske Nu. Komin 5 K. Kosack R. Kossakowski 8 G. Lamanna 8 J.-P. Lenain 3 T. Lohse 3 V. Marandon 2 O. Martineau-Huynh 4 A. Marcowith 10 J. Masbou 8 D. Maurin 4 T.J.L. Mccomb M.C. Medina 3 J. Méhault R. Moderski Emmanuel Moulin 5 M. Naumann-Godo 7 M. de Naurois 4 D. Nedbal D. Nekrassov B. Nicholas J. Niemiec S.J. Nolan S. Ohm J.-F. Olive 1 E. de Oña Wilhelmi K.J. Orford M. Ostrowski M. Panter M. Paz Arribas G. Pedaletti G. Pelletier 6 P.-O. Petrucci 6 S. Pita 2 G. Pühlhofer M. Punch 2 A. Quirrenbach B.C. Raubenheimer M. Raue S.M. Rayner M. Renaud 2 F. Rieger J. Ripken L. Rob S. Rosier-Lees 8 G. Rowell B. Rudak C.B. Rulten J. Ruppel V. Sahakian A. Santangelo R. Schlickeiser F.M. Schöck U. Schwanke 3 S. Schwarzburg S. Schwemmer A. Shalchi M. Sikora J.L. Skilton H. Sol 3 Ł. Stawarz R. Steenkamp C. Stegmann 3 F. Stinzing G. Superina 7 A. Szostek 6 P.H. Tam J.-P. Tavernet 4 R. Terrier 2 O. Tibolla M. Tluczykont C. van Eldik G. Vasileiadis 10 C. Venter L. Venter 3 J.P. Vialle 8 P. Vincent 4 M. Vivier 5 H.J. Völk F. Volpe 7 S.J. Wagner M. Ward A.A. Zdziarski A. Zech 3
Abstract : VHE observations of PKS 2005-489 were made with HESS from 2004 through 2007, together with three simultaneous multi-wavelength campaigns performed with XMM-Newton and RXTE in 2004 and 2005. A strong VHE signal, ~17sigma total, is detected during the four years of HESS observations (90.3 hrs live time). The integral flux above the average analysis threshold of 400 GeV is ~3% of the Crab and varies weakly on time-scales from days to years. At X-ray energies the flux is observed to vary by more than an order of magnitude between 2004 and 2005. Strong changes in the X-ray spectrum (DeltaGamma~0.7) are also observed, which appear to be mirrored in the VHE band. The SED of PKS 2005-489, constructed for the first time with contemporaneous data on both humps, shows significant evolution. The large flux variations in the X-ray band, coupled with weak or no variations in the VHE band and a similar spectral behavior, suggest the emergence of a new, separate, harder emission component in September 2005.
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Submitted on : Thursday, January 7, 2010 - 5:34:21 PM
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Fabio Acero, F. Aharonian, A.G. Akhperjanian, G. Anton, U. Barres de Almeida, et al.. PKS 2005-489 at VHE: Four Years of Monitoring with HESS and Simultaneous Multi-wavelength Observations. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 511, pp.A52. ⟨10.1051/0004-6361/200913073⟩. ⟨in2p3-00445182⟩



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