Multi-wavelength observations of PKS 2155-304 with H.E.S.S

F. Aharonian; A. G. Akhperjanian; A. R. Bazer-Bachi; M. Beilicke; W. Benbow; D. Berge; K. Bernlöhr; C. Boisson; O. Bolz; V. Borrel; I. Braun; F. Breitling; A. M Brown; P. M. Chadwick; L.-M. Chounet; R. Cornils; L. Costamante; B. Degrange; H. J. Dickinson; A. Djannati-Ataï; L. O'C. Drury; G. Dubus; D. Emmanoulopoulos; P. Espigat; F. Feinstein; G. Fontaine; Y. Fuchs; S. Funk; Y.A. Gallant; B. Giebels; S. Gillessen; J. F. Glicenstein; P. Goret; C. Hadjichristidis; M. Hauser; G. Heinzelmann; G. Henri; G. Hermann; J. A. Hinton; W. Hofmann; M. Holleran; D. Horns; A. Jacholkowska; O. C. de Jager; B. Khélifi; Nu. Komin; A. Konopelko; I. J. Latham; R. Le Gallou; A. Lemière; M. Lemoine-Goumard; N. Leroy; T. Lohse; J. M. Martin; O. Martineau-Huynh; A. Marcowith; C. Masterson; T. J. L. Mccomb; M. De Naurois; S. J. Nolan; A. Noutsos; K. J. Orford; J. L. Osborne; M. Ouchrif; M. Panter; G. Pelletier; S. Pita; G. Pühlhofer; M. Punch; B. C. Raubenheimer; M. Raue; J. Raux; S. M. Rayner; A. Reimer; O. Reimer; J. Ripken; L. Rob; L. Rolland; G. Rowell; V. Sahakian; L. Saugé; S. Schlenker; R. Schlickeiser; C. Schuster; U. Schwanke; M. Siewert; H. Sol; D. Spangler; R. Steenkamp; C. Stegmann; J.-P. Tavernet; R. Terrier; C.G. Théoret; M. Tluczykont; G. Vasileiadis; C. Venter; P. Vincent; H. J. Völk; S. J. Wagner

doi:10.1051/0004-6361:20053353

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Multi-wavelength observations of PKS 2155-304 with H.E.S.S

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Multi-wavelength observations of PKS 2155-304 with H.E.S.S

F. Aharonian, A. G. Akhperjanian, A. R. Bazer-Bachi, M. Beilicke, W. Benbow, D. Berge, K. Bernlöhr, C. Boisson, O. Bolz, V. Borrel, …

Astronomy & Astrophysics - A&A, Vol.442, pp.895-907

2005

DOI: https://doi.org/10.1051/0004-6361:20053353

Résumé

BL Lacertae objects: Individual: PKS 2155-304

galaxie: active

gamma rays: observations

X-rays:galaxies

radiation mechanisms: non thermal

The High Energy Stereoscopic System (H.E.S.S.) has observed the high-frequency peaked BL Lac object PKS2155-304 in 2003 between October 19 and November 26 in Very High Energy (VHE) $\gamma$-rays (E $\geq$ 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. The average H.E.S.S. spectrum shows a very soft power law shape with a photon index of 3.37 $\pm$ 0.07${stat} \pm 0.10 {syst}. 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 PKS2155-304 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.

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Titre: Multi-wavelength observations of PKS 2155-304 with H.E.S.S
Créateurs - sans rôle: F. Aharonian - Max Planck Institute for Nuclear Physics
A. G. Akhperjanian - A. Alikhanyan National Laboratory
A. R. Bazer-Bachi - Université Toulouse III - Paul Sabatier
M. Beilicke - Universität Hamburg
W. Benbow - Max Planck Institute for Nuclear Physics
D. Berge - Max Planck Institute for Nuclear Physics
K. Bernlöhr - Humboldt-Universität zu Berlin
C. Boisson - Observatoire de Paris
O. Bolz - Max Planck Institute for Nuclear Physics
V. Borrel - Université Toulouse III - Paul Sabatier
I. Braun - Max Planck Institute for Nuclear Physics
F. Breitling - Humboldt-Universität zu Berlin
A. M Brown - Durham University
P. M. Chadwick - Durham University
L.-M. Chounet - Laboratoire Leprince-Ringuet
R. Cornils - Universität Hamburg
L. Costamante - Max Planck Institute for Nuclear Physics
B. Degrange - Laboratoire d'Informatique de l'École Polytechnique
H. J. Dickinson - Durham University
A. Djannati-Ataï - AstroParticule et Cosmologie
L. O'C. Drury
G. Dubus - Laboratoire d'Informatique de l'École Polytechnique
D. Emmanoulopoulos - Expedeon
P. Espigat - Agence Parisienne du Climat
F. Feinstein - Centre National de la Recherche Scientifique
G. Fontaine - Laboratoire Leprince-Ringuet
Y. Fuchs - Université Joseph Fourier
S. Funk - Max Planck Institute for Nuclear Physics
Y.A. Gallant - Laboratoire de Physique Théorique
B. Giebels - Laboratoire Leprince-Ringuet
S. Gillessen - Max Planck Society
J. F. Glicenstein - CEA Paris-Saclay
P. Goret - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
C. Hadjichristidis - Durham University
M. Hauser - Expedeon
G. Heinzelmann - Universität Hamburg
G. Henri - Centre National de la Recherche Scientifique
G. Hermann - Max Planck Institute for Nuclear Physics
J. A. Hinton - Max Planck Society
W. Hofmann - Max Planck Innovation
M. Holleran - North-West University
D. Horns - Max Planck Society
A. Jacholkowska - Laboratoire de Physique Théorique
O. C. de Jager - North-West University
B. Khélifi - Max Planck Innovation
Nu. Komin - Humboldt-Universität zu Berlin
A. Konopelko - Humboldt-Universität zu Berlin
I. J. Latham - Durham University
R. Le Gallou - Durham University
A. Lemière - Agence Parisienne du Climat
M. Lemoine-Goumard - Laboratoire d'Informatique de l'École Polytechnique
N. Leroy - Centre National de la Recherche Scientifique
T. Lohse - Humboldt-Universität zu Berlin
J. M. Martin - Observatoire de Paris
O. Martineau-Huynh - Laboratoire de Physique Nucléaire et de Hautes Énergies
A. Marcowith
C. Masterson - Max Planck Institute for Nuclear Physics
T. J. L. Mccomb - Durham University
M. De Naurois - Sorbonne Université
S. J. Nolan - Durham University
A. Noutsos - Durham University
K. J. Orford - Durham University
J. L. Osborne - Durham University
M. Ouchrif - Laboratoire de Physique Nucléaire et de Hautes Énergies
M. Panter - Max Planck Institute for Nuclear Physics
G. Pelletier - Université Joseph Fourier
S. Pita - Agence Parisienne du Climat
G. Pühlhofer - Heidelberg University
M. Punch - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
B. C. Raubenheimer - North-West University
M. Raue - Universität Hamburg
J. Raux - Laboratoire de Physique Nucléaire et de Hautes Énergies
S. M. Rayner - Durham University
A. Reimer - Ruhr University Bochum
O. Reimer - Ruhr University Bochum
J. Ripken - Universität Hamburg
L. Rob - Charles University
L. Rolland - Centre National de la Recherche Scientifique
G. Rowell - Max Planck Institute for Nuclear Physics
V. Sahakian - Université Paris Cité
L. Saugé - Université Joseph Fourier
S. Schlenker - Humboldt-Universität zu Berlin
R. Schlickeiser - Ruhr University Bochum
C. Schuster - Ruhr University Bochum
U. Schwanke - Humboldt-Universität zu Berlin
M. Siewert - Ruhr University Bochum
H. Sol - Université Paris Cité
D. Spangler - Durham University
R. Steenkamp - University of Namibia
C. Stegmann - Humboldt-Universität zu Berlin
J.-P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. Terrier - Observatoire de Paris
C.G. Théoret - Centre National de la Recherche Scientifique
M. Tluczykont - Laboratoire Leprince-Ringuet
G. Vasileiadis - Laboratoire de Physique Théorique
C. Venter - North-West University
P. Vincent - Laboratoire de Physique Nucléaire et de Hautes Énergies
H. J. Völk - Max Planck Innovation
S. J. Wagner - Heidelberg University
Détails de publication: Astronomy & Astrophysics - A&A, Vol.442, pp.895-907
Identifiants: 99151554909311
Unité académique: Université de Montpellier
Langue: English
Type de ressource: Journal article
Champs locaux: in2p3-00024349