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  Simultaneous Observations of PKS 2155-304 with HESS, Fermi, RXTE, and Atom: Spectral Energy Distributions and Variability in a Low State

Aharonian, F., Akhperjanian, A. G., Anton, G., de Almeida, U. B., Bazer-Bachi, A. R., Becherini, Y., et al. (2009). Simultaneous Observations of PKS 2155-304 with HESS, Fermi, RXTE, and Atom: Spectral Energy Distributions and Variability in a Low State. The Astrophysical Journal Letters, 696(2), L150-L155. doi:10.1088/0004-637X/696/2/L150.

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Aharonian, F.1, Autor           
Akhperjanian, A. G.1, Autor           
Anton, G.2, Autor
de Almeida, U. B.2, Autor
Bazer-Bachi, A. R.2, Autor
Becherini, Y.2, Autor
Behera, B.2, Autor
Bernlöhr, K.1, Autor           
Boisson, C.2, Autor
Bochow, A.1, Autor           
Borrel, V.2, Autor
Braun, I.1, Autor           
Brion, E.2, Autor
Brucker, J.2, Autor
Brun, P.2, Autor
Bühler, R.1, Autor           
Bulik, T.2, Autor
Busching, I.2, Autor
Boutelier, T.2, Autor
Chadwick, P. M.2, Autor
Charbonnier, A.2, AutorChaves, R. C. G.1, Autor           Cheesebrough, A.2, AutorChounet, L. M.2, AutorClapson, A. C.1, Autor           Coignet, G.2, AutorDalton, M.2, AutorDaniel, M. K.2, AutorDavids, I. D.2, AutorDegrange, B.2, AutorDeil, C.1, Autor           Dickinson, H. J.2, AutorDjannati-Atai, A.1, Autor           Domainko, W.3, AutorDrury, L. O.2, AutorDubois, F.2, AutorDubus, G.1, Autor           Dyks, J.2, AutorDyrda, M.1, Autor           Egberts, K.1, Autor           Emmanoulopoulos, D.2, AutorEspigat, P.2, AutorFarnier, C.2, AutorFeinstein, F.1, Autor           Fiasson, A.2, AutorFoerster, A.1, Autor           Fontaine, G.2, AutorFussling, M.2, AutorGabici, S.1, Autor           Gallant, Y. A.1, Autor           Gerard, L.2, AutorGiebels, B.2, AutorGlicenstein, J. F.2, AutorGluck, B.2, AutorGoret, P.2, AutorHauser, D.1, Autor           Hauser, M.2, AutorHeinz, S.2, AutorHeinzelmann, G.2, AutorHenri, G.2, AutorHermann, G.1, Autor           Hinton, J. A.1, Autor           Hoffmann, A.2, AutorHofmann, W.1, Autor           Holleran, M.2, AutorHoppe, S.1, Autor           Horns, D.1, Autor           Jacholkowska, A.2, Autorde Jager, O. C.2, AutorJung, I.1, Autor           Katarzynski, K.2, AutorKatz, U.2, AutorKaufmann, S.2, AutorKendziorra, E.2, AutorKerschhaggl, M.2, AutorKhangulyan, D.1, Autor           Khelifi, B.2, AutorKeogh, D.2, AutorKomin, N.2, AutorKosack, K.1, Autor           Lamanna, G.2, AutorLenain, J. P.2, AutorLohse, T.2, AutorMarandon, V.2, AutorMartin, J. M.2, AutorMartineau-Huynh, O.2, AutorMarcowith, A.2, AutorMaurin, D.2, AutorMcComb, T. J. L.2, AutorMedina, M. C.2, AutorModerski, R.2, AutorMoulin, E.2, AutorNaumann-Godo, M.2, Autorde Naurois, M.1, Autor           Nedbal, D.1, Autor           Nekrassov, D.1, Autor           Niemiec, J.2, AutorNolan, S. J.2, AutorOhm, S.1, Autor           Olive, J. F.2, AutorWilhelmi, E. D.1, Autor           Orford, K. J.1, Autor           Ostrowski, M.2, AutorPanter, M.1, Autor           Arribas, M. P.2, AutorPedaletti, G.2, AutorPelletier, G.2, AutorPetrucci, P. O.2, AutorPita, S.2, AutorPuhlhofer, G.1, Autor           Punch, M.2, AutorQuirrenbach, A.2, AutorRaubenheimer, B. C.2, AutorRaue, M.1, Autor           Rayner, S. M.2, AutorReimer, O.2, AutorRenaud, M.1, Autor           Rieger, F.1, Autor           Ripken, J.2, AutorRob, L.2, AutorRosier-Lees, S.2, AutorRowell, G.1, Autor           Rudak, B.2, AutorRulten, C. B.2, AutorRuppel, J.2, AutorSahakian, V.2, AutorSantangelo, A.1, Autor           Schlickeiser, R.2, AutorSchock, F. M.2, AutorSchroder, R.2, AutorSchwanke, U.2, AutorSchwarzburg, S.2, AutorSchwemmer, S.2, AutorShalchi, A.2, AutorSkilton, J. L.2, AutorSol, H.2, AutorSpangler, D.2, AutorStawarz, L.1, Autor           Steenkamp, R.2, AutorStegmann, C.2, AutorSuperina, G.2, AutorSzostek, A.1, Autor           Tam, P. H.2, AutorTavernet, J. P.2, AutorTerrier, R.2, AutorTibolla, O.1, Autor           van Eldik, C.1, Autor           Vasileiadis, G.1, Autor           Venter, C.2, AutorVenter, L.2, AutorVialle, J. P.2, AutorVincent, P.2, AutorVivier, M.2, AutorVoelk, H. J.4, Autor           Volpe, F.1, Autor           Wagner, S. J.2, AutorWard, M.2, AutorZdziarski, A. A.2, AutorZech, A.2, Autor mehr..
Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              
2[Aharonian, F.; Drury, L. O'C.; Gabici, S.] Dublin Inst Adv Studies, Dublin 2, Ireland.; [Akhperjanian, A. G.; Sahakian, V.] Yerevan Phys Inst, Yerevan 375036, Armenia.; [Anton, G.; Brucker, J.; Glueck, B.; Heinz, S.; Jung, I.; Katz, U.; Schoeck, F. M.; Stegmann, C.] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany.; [de Almeida, U. Barres; Chadwick, P. M.; Cheesebrough, A.; Daniel, M. K.; Dickinson, H. J.; Keogh, D.; McComb, T. J. L.; Nolan, S. J.; Orford, K. J.; Rayner, S. M.; Rulten, C. B.; Spangler, D.; Ward, M.] Univ Durham, Dept Phys, Durham DH1 3LE, England.; [Bazer-Bachi, A. R.; Borrel, V.; Olive, J. -F.] CNRS UPS, Ctr Etud Spatiale Rayonnements, F-31029 Toulouse 4, France.; [Becherini, Y.; Djannati-Atai, A.; Espigat, P.; Gerard, L.; Marandon, V.; Wilhelmi, E. de Ona; Pita, S.; Punch, M.; Renaud, M.; Terrier, R.] Univ Paris 07, CNRS, CEA, Observ Paris,UMR 7164, F-75205 Paris 13, France.; [Behera, B.; Emmanoulopoulos, D.; Hauser, D.; Hauser, M.; Kaufmann, S.; Puehlhofer, G.; Quirrenbach, A.; Schwemmer, S.; Tam, P. H.; Tibolla, O.; Wagner, S. J.] Univ Heidelberg, D-69117 Heidelberg, Germany.; [Bernloehr, K.; Dalton, M.; Fuessling, M.; Kerschhaggl, M.; Lohse, T.; Schwanke, U.] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany.; [Boisson, C.; Lenain, J. -P.; Martin, J. M.; Sol, H.; Venter, L.; Zech, A.] Univ Paris Diderot, LUTH, Observ Paris, CNRS, F-92190 Meudon, France.; [Brion, E.; Brun, P.; Glicenstein, J. F.; Goret, P.; Komin, Nu.; Moulin, E.; Vivier, M.] CE Saclay, IRFU, DSM, CEA, F-91191 Gif Sur Yvette, France.; [Bulik, T.; Dyks, J.; Moderski, R.; Rudak, B.; Zdziarski, A. A.] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland.; [Buesching, I.; Davids, I. D.; Holleran, M.; de Jager, O. C.; Raubenheimer, B. C.; Venter, C.] North West Univ, Unit Space Phys, ZA-2520 Potchefstroom, South Africa.; [Boutelier, T.; Dubus, G.; Henri, G.; Pelletier, G.; Petrucci, P. -O.] Univ Grenoble 1, Lab Astrophys Grenoble, INSU, CNRS, F-38041 Grenoble 9, France.; [Charbonnier, A.; Jacholkowska, A.; Martineau-Huynh, O.; Maurin, D.; de Naurois, M.; Tavernet, J. -P.; Vincent, P.] Univ Paris 07, LPNHE, Univ Paris 06, CNRS,IN2P3, F-75252 Paris 5, France.; [Chounet, L. -M.; Degrange, B.; Fontaine, G.; Giebels, B.; Khelifi, B.; Naumann-Godo, M.; Superina, G.; Volpe, F.] Ecole Polytech, CNRS, Lab Leprince Ringuet, IN2P3, F-91128 Palaiseau, France.; [Coignet, G.; Dubois, F.; Lamanna, G.; Rosier-Lees, S.; Vialle, J. P.] CNRS, IN2P3, Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France.; [Davids, I. D.; Steenkamp, R.; Venter, C.] Univ Namibia, Windhoek, Namibia.; [Dyrda, M.] Inst Fizyki Jadrowej PAN, PL-31342 Krakow, Poland.; [Farnier, C.; Feinstein, F.; Fiasson, A.; Gallant, Y. A.; Marcowith, A.; Vasileiadis, G.] Univ Montpellier 2, Lab Phys Theor & Astroparticules, CNRS, IN2P3,CC 70, F-34095 Montpellier 5, France.; [Heinzelmann, G.; Horns, D.; Ripken, J.] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany.; [Hinton, J. A.; Skilton, J. L.] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England.; [Hoffmann, A.; Kendziorra, E.; Santangelo, A.; Schwarzburg, S.] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany.; [Katarzynski, K.] Nicholas Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland.; [Nedbal, D.; Rob, L.] Charles Univ Prague, Inst Particle & Nucl Phys, CR-18000 Prague 8, Czech Republic.; [Ostrowski, M.; Stawarz, L.] Univ Jagiellonski, Obserwatorium Astron, PL-30244 Krakow, Poland.; [Reimer, O.] Stanford Univ, HEPL & KIPAC, Stanford, CA 94305 USA.; [Rowell, G.] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia.; [Ruppel, J.; Schlickeiser, R.; Schroeder, R.; Shalchi, A.] Ruhr Univ Bochum, Inst Theoret Phys, Lehrstuhl Weltraum & Astrophys 4, D-44780 Bochum, Germany., ou_persistent22              
3Max Planck Society, ou_persistent13              
4Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907548              

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Schlagwörter: BL Lacertae objects: individual: PKS 2155–304, galaxies: active, gamma rays: observations
 Zusammenfassung: We report on the first simultaneous observations that cover the optical, X-ray, and high-energy gamma-ray bands of the BL Lac object PKS 2155-304. The gamma-ray bands were observed for 11 days, between 2008 August 25 and 2008 September 6 (MJD 54704-54715), jointly with the Fermi Gamma-ray Space Telescope and the HESS atmospheric Cherenkov array, providing the first simultaneous MeV-TeV spectral energy distribution (SED) with the new generation of γ-ray telescopes. The ATOM telescope and the RXTE and Swift observatories provided optical and X-ray coverage of the low-energy component over the same time period. The object was close to the lowest archival X-ray and very high energy (VHE; >100 GeV) state, whereas the optical flux was much higher. The light curves show relatively little (~30%) variability overall when compared to past flaring episodes, but we find a clear optical/VHE correlation and evidence for a correlation of the X-rays with the high-energy spectral index. Contrary to previous observations in the flaring state, we do not find any correlation between the X-ray and VHE components. Although synchrotron self-Compton models are often invoked to explain the SEDs of BL Lac objects, the most common versions of these models are at odds with the correlated variability we find in the various bands for PKS 2155-304.

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Sprache(n): eng - English
 Datum: 2009-04-24
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: eDoc: 464562
DOI: 10.1088/0004-637X/696/2/L150
 Art des Abschluß: -

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Titel: The Astrophysical Journal Letters
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 696 (2) Artikelnummer: - Start- / Endseite: L150 - L155 Identifikator: -