Multi-wavelength observations of PKS 2155-304 with HESS

被引:96
作者
Aharonian, F [1 ]
Akhperjanian, AG
Bazer-Bachi, AR
Beilicke, M
Benbow, W
Berge, D
Bernlöhr, K
Boisson, C
Bolz, O
Borrel, V
Braun, I
Breitling, F
Brown, AM
Chadwick, PM
Chounet, LM
Cornils, R
Costamante, L
Degrange, B
Dickinson, HJ
Djannati-Atai, A
Drury, LO
Dubus, G
Emmanoulopoulos, D
Espigat, P
Feinstein, F
Fontaine, G
Fuchs, Y
Funk, S
Gallant, YA
Giebels, B
Gillessen, S
Glicenstein, JF
Goret, P
Hadjichristidis, C
Hauser, M
Heinzelmann, G
Henri, G
Hermann, G
Hinton, JA
Hofmann, W
Holleran, M
Horns, D
Jacholkowska, A
de Jager, OC
Khélifi, B
Komin, N
Konopelko, A
Latham, IJ
Le Gallou, R
Lemière, A
机构
[1] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[2] Yerevan Phys Inst, Yerevan 375036, Armenia
[3] UPS, CNRS, Ctr Etud Spatiale Rayonnements, Toulouse, France
[4] Univ Hamburg, Inst Expt Phys, Hamburg, Germany
[5] Humboldt Univ, Inst Phys, Berlin, Germany
[6] Observ Paris, Sect Meudon, CNRS,UMR 8102, LUTH, Paris, France
[7] Univ Durham, Dept Phys, Durham DH1 3HP, England
[8] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France
[9] APC, Paris, France
[10] Dublin Inst Adv Studies, Dublin 4, Ireland
[11] Landessternwarte Heidelberg, Heidelberg, Germany
[12] Univ Montpellier 2, CNRS, IN2P3, Lab Phys Theor & Astroparticules, F-34095 Montpellier, France
[13] Univ Grenoble 1, CNRS, INSU, Lab Astrophys Grenoble, F-38041 Grenoble, France
[14] Ctr Etud Saclay, DAPNIA, DSM, CEA, F-91191 Gif Sur Yvette, France
[15] NW Univ, Unit Space Phys, Potchefstroom, South Africa
[16] Univ Paris 06, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, Paris, France
[17] Univ Paris 07, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, Paris, France
[18] Ruhr Univ Bochum, Inst Theoret Phys, Lehrstuhl Weltraum & Astrophys 4, Bochum, Germany
[19] Charles Univ Prague, Inst Nucl & Particle Phys, Prague, Czech Republic
[20] Univ Namibia 1, Windhoek, Namibia
关键词
galaxies : active; gamma rays : observations; X-rays : galaxies; radiation mechanisms : non thermal;
D O I
10.1051/0004-6361:20053353
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The High Energy Stereoscopic System (HESS) has observed the high-frequency peaked BL Lac object PKS 2155- 304 in 2003 between October 19 and November 26 in Very High Energy (VHE) gamma-rays (E >= 160 GeV for these observations). Observations were carried out simultaneously with the Proportional Counter Array (PCA) on board the Rossi X-ray Timing Explorer satellite ( RXTE), the Robotic Optical Transient Search Experiment (ROTSE) and the Nancay decimetric radiotelescope (NRT). Intra-night variability is seen in the VHE band, the source being detected with a high significance on each night it was observed. Variability is also found in the X-ray and optical bands on kilosecond timescales, along with flux-dependent spectral changes in the X-rays. A transient X-ray event with a 1500 s timescale is detected, making this the fastest X-ray flare seen in this object. No correlation can be established between the X-ray and the gamma-ray fluxes, or any of the other wavebands, over the small range of observed variability. The average HESS spectrum shows a very soft power law shape with a photon index of 3.37 +/- 0.07(stat) +/- 0.10(sys). The energy outputs in the 2 - 10 keV and in the VHE gamma-ray range are found to be similar, with the X-rays and the optical fluxes at a level comparable to some of the lowest historical measurements, indicating that PKS 2155- 304 was in a low or quiescent state during the observations. Both a leptonic and a hadronic model are used to derive source parameters from these observations. These parameters are found to be sensitive to the model of Extragalactic Background Light (EBL) that attenuates the VHE signal at this source's redshift (z = 0.117).
引用
收藏
页码:895 / 907
页数:13
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