Simultaneous multiwavelength observations of the second exceptional gamma-ray flare of PKS 2155-304 in July 2006

F. Aharonian; A.G. Akhperjanian; G. Anton; U. Barres de Almeida; A.R. Bazer-Bachi; Y. Becherini; B. Behera; K. Bernlöhr; A. Bochow; C. Boisson; V. Borrel; T. Boutelier; I. Braun; E. Brion; J. Brucker; P. Brun; R. Bühler; T. Bulik; I. Büsching; P.M. Chadwicks; A. Charbonnier; R.C.G. Chaves; A. Cheesebrough; L.-M. Chounet; A.C. Clapson; G. Coignet; M. Dalton; M.K. Daniel; I.D. Davids; B. Degrange; C. Deil; H.J. Dickinson; A. Djannati-Ataï; W. Domainko; L.O'C. Drury; F. Dubois; G. Dubus; J. Dyks; M. Dyrda; K. Egberts; D. Emmanoulopoulos; P. Espigat; C. Farnier; F. Feinstein; A. Fiasson; A. Förster; G. Fontaine; M. Füssling; S. Gabici; Y.A. Gallant; L. Gérard; B. Giebels; J.F. Glicenstein; B. Glück; P. Goret; D. Hauser; M. Hauser; S. Heinz; G. Heinzelmann; G. Henri; G. Hermann; J.A. Hinton; A. Hoffmann; W. Hofmann; M. Holleran; S. Hoppe; D. Horns; A. Jacholkowska; O.C. de Jager; I. Jung; K. Katarzynski; U. Katz; E. Kendziorra; M. Kerschhagg; D. Khangulyan; B. Khélifi; D. Keogh; Nu. Komin; K. Kosack; G. Lamanna; J.-P. Lenain; T. Lohse; V. Marandon; J.M. Martin; O. Martineau-Huynh; A. Marcowith; C. Masterson; D. Maurin; T.J.L. Mccomb; M.C. Medina; R. Moderski; Emmanuel Moulin; M. Naumann-Godo; M. de Naurois; D. Nedbal; D. Nekrassov; J. Niemiec; S.J. Nolan; S. Ohm; J.-P. Olive; E. de Ona Wilhelmi; K.J. Orford; M. Ostrowski; M. Panter; M. Paz Arribas; G. Pedaletti; G. Pelletier; P.-O. Petrucci; S. Pita; G. P¨uhlhofer; M. Punch; A. Quirrenbach; B.C. Raubenheimer; M. Raue; S.M. Rayner; M. Renaud; F. Rieger; J. Ripken; L. Rob; S. Rosier-Lees; G. Rowell; B. Rudak; C.B. Rulten; J. Ruppel; V. Sahakian; A. Santangelo; R. Schlickeiser; F. Schock; R. Schroder; U. Schwanke; S. Schwarzburg; S. Schwemmer; A. Shalchi; J.L. Skilton; H. Sol; D. Spangler; Ł. Stawarz; R. Steenkamp; C. Stegmann; G. Superina; A. Szostek; P.H. Tam; J.-P. Tavernet; R. Terrier; O. Tibolla; C. van Eldik; G. Vasileiadis; C. Venter; L. Venter; J.P. Vialle; P. Vincent; M. Vivier; H.J. Volk; F. Volpe; S.J. Wagner; M. Ward; A.A. Zdziarski; A. Zech

doi:10.1051/0004-6361/200912128

Back

Simultaneous multiwavelength observations of the second exceptional gamma-ray flare of PKS 2155-304 in July 2006

Journal article

Open access

Peer reviewed

Simultaneous multiwavelength observations of the second exceptional gamma-ray flare of PKS 2155-304 in July 2006

F. Aharonian, A.G. Akhperjanian, G. Anton, U. Barres de Almeida, A.R. Bazer-Bachi, Y. Becherini, B. Behera, K. Bernlöhr, A. Bochow, C. Boisson, …

Astronomy & Astrophysics - A&A, Vol.502, pp.749-770

2009

DOI: https://doi.org/10.1051/0004-6361/200912128

Abstract

Simultaneous HESS/CHANDRA/optical observations were performed on the BL Lac object PKS 2155-304 in the night of July 29-30 2006, when the source underwent its second major gamma-ray outburst in Summer 2006. This event took place about 44 hours after the July 28 outburst, known for its ultrafast variability. An unprecedented 6 to 8 hours of uninterrupted coverage was achieved, with spectra and light curves measured down to 7 and 2-minute timescales, respectively. The gamma-ray flux reached a maximum of 11x the Crab flux (>400 GeV), with rise/decay timescales of ~1 hour, plus a few smaller-amplitude flares superimposed on the decaying phase. The emission in the X-ray and VHE bands is strongly correlated, both in flux and spectrum, with no evidence of lags. The VHE spectrum shows a curvature that is variable with time and stronger at higher fluxes. The huge VHE variations (22x) are only accompanied by small-amplitude X-ray and optical variations (factor 2 and 15% respectively). The source has shown for the first time in an HBL a large Compton dominance (L_C/L_S ~10) -- rapidly evolving -- and a cubic relation between VHE and X-ray flux variations, during a decaying phase. These results challenge the common scenarios for the TeV-blazar emission.

Files and links (2)

url

Find in HALView

url

https://doi.org/10.1051/0004-6361/200912128View

Published (Version of record) Open

Metrics

1 Record Views

Details

Title: Simultaneous multiwavelength observations of the second exceptional gamma-ray flare of PKS 2155-304 in July 2006
Creators - without role: F. Aharonian - Dublin Institute For Advanced Studies
A.G. Akhperjanian - A. Alikhanyan National Laboratory
G. Anton - Friedrich-Alexander-Universität Erlangen-Nürnberg
U. Barres de Almeida
A.R. Bazer-Bachi - Université Toulouse III - Paul Sabatier
Y. Becherini - Laboratoire AstroParticule et Cosmologie
B. Behera - Heidelberg University
K. Bernlöhr - Humboldt-Universität zu Berlin
A. Bochow
C. Boisson - Délégation Paris 7
V. Borrel - Université Toulouse III - Paul Sabatier
T. Boutelier - Université Joseph Fourier
I. Braun
E. Brion - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
J. Brucker - Friedrich-Alexander-Universität Erlangen-Nürnberg
P. Brun - Institut de Recherche sur les Lois Fondamentales de l'Univers
R. Bühler
T. Bulik - Nicolaus Copernicus Astronomical Center
I. Büsching - North-West University
P.M. Chadwicks
A. Charbonnier - Sorbonne Université
R.C.G. Chaves
A. Cheesebrough - Durham University
L.-M. Chounet - Laboratoire Leprince-Ringuet
A.C. Clapson
G. Coignet - Laboratoire d’Annecy de Physique des Particules
M. Dalton - Humboldt-Universität zu Berlin
M.K. Daniel - Durham University
I.D. Davids - University of Namibia
B. Degrange - École Polytechnique
C. Deil
H.J. Dickinson - Durham University
A. Djannati-Ataï - APC - Astrophysique des Hautes Energies
W. Domainko
L.O'C. Drury
F. Dubois - Institut National de Physique Nucléaire et de Physique des Particules
G. Dubus - Université Joseph Fourier
J. Dyks - Nicolaus Copernicus Astronomical Center
M. Dyrda - Institute of Nuclear Physics, Polish Academy of Sciences
K. Egberts
D. Emmanoulopoulos - Heidelberg University
P. Espigat - Centre National de la Recherche Scientifique
C. Farnier - Laboratoire de Physique Théorique
F. Feinstein - Institut National de Physique Nucléaire et de Physique des Particules
A. Fiasson - Laboratoire de Physique Théorique
A. Förster
G. Fontaine - Laboratoire Leprince-Ringuet
M. Füssling
S. Gabici - Dublin Institute For Advanced Studies
Y.A. Gallant - Laboratoire de Physique Théorique
L. Gérard - Université Paris Cité
B. Giebels - Laboratoire Leprince-Ringuet
J.F. Glicenstein - CEA Paris-Saclay
B. Glück - Friedrich-Alexander-Universität Erlangen-Nürnberg
P. Goret - Institut de Recherche sur les Lois Fondamentales de l'Univers
D. Hauser - Heidelberg University
M. Hauser - Heidelberg University
S. Heinz - Friedrich-Alexander-Universität Erlangen-Nürnberg
G. Heinzelmann - Universität Hamburg
G. Henri - Centre National de la Recherche Scientifique
G. Hermann
J.A. Hinton - University of Leeds
A. Hoffmann - University of Tübingen
W. Hofmann
M. Holleran - North-West University
S. Hoppe
D. Horns - Universität Hamburg
A. Jacholkowska - Laboratoire de Physique Nucléaire et de Hautes Énergies
O.C. de Jager - North-West University
I. Jung - Friedrich-Alexander-Universität Erlangen-Nürnberg
K. Katarzynski - Nicolaus Copernicus University
U. Katz - Friedrich-Alexander-Universität Erlangen-Nürnberg
E. Kendziorra - University of Tübingen
M. Kerschhagg
D. Khangulyan
B. Khélifi - École Polytechnique
D. Keogh - Durham University
Nu. Komin - Institut de Recherche sur les Lois Fondamentales de l'Univers
K. Kosack
G. Lamanna - Centre National de la Recherche Scientifique
J.-P. Lenain - Délégation Paris 7
T. Lohse - Humboldt-Universität zu Berlin
V. Marandon - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
J.M. Martin - Université Paris Cité
O. Martineau-Huynh - Laboratoire de Physique Nucléaire et de Hautes Énergies
A. Marcowith - Laboratoire de Physique Théorique
C. Masterson
D. Maurin - Université Paris Cité
T.J.L. Mccomb - Durham University
M.C. Medina - Délégation Paris 7
R. Moderski - Nicolaus Copernicus Astronomical Center
Emmanuel Moulin - Institut de Recherche sur les Lois Fondamentales de l'Univers
M. Naumann-Godo - École Polytechnique
M. de Naurois - Centre National de la Recherche Scientifique
D. Nedbal - Charles University
D. Nekrassov
J. Niemiec - Institute of Nuclear Physics, Polish Academy of Sciences
S.J. Nolan - Durham University
S. Ohm
J.-P. Olive - Centre d'étude spatiale des rayonnements
E. de Ona Wilhelmi - Laboratoire AstroParticule et Cosmologie
K.J. Orford - Durham University
M. Ostrowski - Jagiellonian University
M. Panter
M. Paz Arribas
G. Pedaletti - Heidelberg University
G. Pelletier - Université Joseph Fourier
P.-O. Petrucci - Centre National de la Recherche Scientifique
S. Pita - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
G. P¨uhlhofer
M. Punch - Laboratoire AstroParticule et Cosmologie
A. Quirrenbach - Heidelberg University
B.C. Raubenheimer - North-West University
M. Raue
S.M. Rayner - Durham University
M. Renaud - Laboratoire AstroParticule et Cosmologie
F. Rieger
J. Ripken - Universität Hamburg
L. Rob - Charles University
S. Rosier-Lees - Institut National de Physique Nucléaire et de Physique des Particules
G. Rowell - University of Adelaide
B. Rudak - Nicolaus Copernicus Astronomical Center
C.B. Rulten - Durham University
J. Ruppel - Ruhr University Bochum
V. Sahakian - A. Alikhanyan National Laboratory
A. Santangelo - University of Tübingen
R. Schlickeiser - Ruhr University Bochum
F. Schock - Friedrich-Alexander-Universität Erlangen-Nürnberg
R. Schroder - Ruhr University Bochum
U. Schwanke - Humboldt-Universität zu Berlin
S. Schwarzburg - University of Tübingen
S. Schwemmer - Heidelberg University
A. Shalchi - Ruhr University Bochum
J.L. Skilton - University of Leeds
H. Sol - Université Paris Cité
D. Spangler - Durham University
Ł. Stawarz - Jagiellonian University
R. Steenkamp - University of Namibia
C. Stegmann - Friedrich-Alexander-Universität Erlangen-Nürnberg
G. Superina - École Polytechnique
A. Szostek - Centre National de la Recherche Scientifique
P.H. Tam - Heidelberg University
J.-P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. Terrier - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
O. Tibolla - Heidelberg University
C. van Eldik
G. Vasileiadis - Université de Montpellier
C. Venter - North-West University
L. Venter - Université Paris Cité
J.P. Vialle - Institut National de Physique Nucléaire et de Physique des Particules
P. Vincent - Centre National de la Recherche Scientifique
M. Vivier - Institut de Recherche sur les Lois Fondamentales de l'Univers
H.J. Volk
F. Volpe - Centre National de la Recherche Scientifique
S.J. Wagner - Heidelberg University
M. Ward - Durham University
A.A. Zdziarski - Nicolaus Copernicus Astronomical Center
A. Zech - Délégation Paris 7
Publication Details: Astronomy & Astrophysics - A&A, Vol.502, pp.749-770
Identifiers: 9941335209311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00410643