Evidence for VHE Gamma-ray Emission from the Distant BL Lac PG 1553+113

F. Aharonian; A.G. Akhperjanian; A.R. Bazer-Bachi; M. Beilicke; Wystan Benbow; David Berge; K. Bernlohr; C. Boisson; O. Bolz; V. Borrel; I. Braun; F. Breitling; A.M. Brown; R. Buhler; S. Carrigan; P.M. Chadwick; L.-M. Chounet; R. Cornils; L. Costamante; B. Degrange; H.J. Dickinson; A. Djannati-Ataï; L.O'C. Drury; G. Dubus; K. Egberts; D. Emmanoulopoulos; P. Espigat; F. Feinstein; G. Fontaine; S. Funk; Y. Gallant; B. Giebels; J.F. Glicenstein; P. Goret; C. Hadjichristidis; D. Hauser; M. Hauser; G. Heinzelmann; G. Henri; G. Hermann; J.A. Hinton; W. Hofmann; M. Holleran; Dieter Horns; A. Jacholkowska; O.C. de Jager; B. Khelifi; S. Klages; Nu. Komin; A. Konopelko; I.J. Latham; R. Le Gallou; A. Lemiere; M. Lemoine-Goumard; T. Lohse; J.M. Martin; O. Martineau-Huynh; A. Marcowith; C. Masterson; T.J.L. Mccomb; M. de Naurois; D. Nedbal; S.J. Nolan; A. Noutsos; K.J. Orford; J.L. Osborne; M. Ouchrif; M. Panter; G. Pelletier; S. Pita; G. Puhlhofer; M. Punch; B.C. Raubenheimer; M. Raue; S.M. Rayner; A. Reimer; O. Reimer; J. Ripken; L. Rob; L. Rolland; G. Rowell; V. Sahakian; L. Sauge; S. Schlenker; R. Schlickeiser; C. Schuster; U. Schwanke; M. Siewert; H. Sol; D. Spangler; R. Steenkamp; C. Stegmann; G. Superina; J.-P. Tavernet; R. Terrier; C.G. Theoret; M. Tluczykont; C. van Eldik; G. Vasileiadis; C. Venter; P. Vincent; H.J. Volk; S.J. Wagner; M. Ward

doi:10.1051/0004-6361:200600010

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Evidence for VHE Gamma-ray Emission from the Distant BL Lac PG 1553+113

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Evidence for VHE Gamma-ray Emission from the Distant BL Lac PG 1553+113

F. Aharonian, A.G. Akhperjanian, A.R. Bazer-Bachi, M. Beilicke, Wystan Benbow, David Berge, K. Bernlohr, C. Boisson, O. Bolz, V. Borrel, …

Astronomy & Astrophysics - A&A, Vol.448, pp.L19-L23

2006

DOI: https://doi.org/10.1051/0004-6361:200600010

Résumé

Galaxies: active

BL lacertae objects: Individual: PG 1553+113

Gamma rays: observations

The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the H.E.S.S. stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the H.E.S.S. standard analysis, an excess was measured at the 4.0 sigma level in these observations (7.6 hours live time). Three alternative, lower-threshold analyses yield >5 sigma excesses. The observed integral flux above 200 GeV is (4.8 +/- 1.3_{stat} +/- 1.0_{syst}) x10^{-12} cm^{-2} s^{-1}, and shows no evidence for variability. The measured energy spectrum is characterized by a very soft power law (photon index of Gamma=4.0 +/- 0.6). Although the redshift of PG 1553+113 is unknown, there are strong indications that it is greater than z=0.25 and possibly larger than z=0.78. The observed spectrum is interpreted in the context of VHE gamma-ray absorption by the Extragalactic Background Light, and is used to place an upper limit on the redshift of z<0.74.

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Titre: Evidence for VHE Gamma-ray Emission from the Distant BL Lac PG 1553+113
Créateurs - sans rôle: F. Aharonian - Max Planck Institute for Nuclear Physics
A.G. Akhperjanian - Max Planck Innovation
A.R. Bazer-Bachi - Université Toulouse III - Paul Sabatier
M. Beilicke - Max Planck Society
Wystan Benbow - Max Planck Institute for Nuclear Physics
David Berge - Max Planck Innovation
K. Bernlohr - Max Planck Institute for Nuclear Physics
C. Boisson - Observatoire de Paris
O. Bolz - Max Planck Institute for Nuclear Physics
V. Borrel - Université Toulouse III - Paul Sabatier
I. Braun - Max Planck Society
F. Breitling - Humboldt-Universität zu Berlin
A.M. Brown - Durham University
R. Buhler - Max Planck Institute for Nuclear Physics
S. Carrigan - Max Planck Institute for Nuclear Physics
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 - École Polytechnique
H.J. Dickinson - Durham University
A. Djannati-Ataï - AstroParticule et Cosmologie
L.O'C. Drury
G. Dubus - Max Planck Society
K. Egberts - Université de Montpellier
D. Emmanoulopoulos
P. Espigat - Centre National de la Recherche Scientifique
F. Feinstein - Laboratoire de Physique Théorique
G. Fontaine - Laboratoire Leprince-Ringuet
S. Funk - Max Planck Institute for Nuclear Physics
Y. Gallant - Max Planck Innovation
B. Giebels - Laboratoire Leprince-Ringuet
J.F. Glicenstein - Max Planck Society
P. Goret - DSM (Netherlands)
C. Hadjichristidis - Durham University
D. Hauser - Max Planck Institute for Nuclear Physics
M. Hauser
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 Society
M. Holleran - North-West University
Dieter Horns - Max Planck Institute for Nuclear Physics
A. Jacholkowska - Laboratoire de Physique Théorique
O.C. de Jager - North-West University
B. Khelifi - Laboratoire Leprince-Ringuet
S. Klages
Nu. Komin - Humboldt-Universität zu Berlin
A. Konopelko - Max Planck Innovation
I.J. Latham - Durham University
R. Le Gallou - Durham University
A. Lemiere - Université Paris Cité
M. Lemoine-Goumard - Laboratoire Leprince-Ringuet
T. Lohse - Humboldt-Universität zu Berlin
J.M. Martin - Centre National de la Recherche Scientifique
O. Martineau-Huynh - Laboratoire de Physique Nucléaire et de Hautes Énergies
A. Marcowith - Centre de Gestion Scientifique
C. Masterson - Max Planck Institute for Nuclear Physics
T.J.L. Mccomb - Durham University
M. de Naurois - Max Planck Society
D. Nedbal - Max Planck Society
S.J. Nolan - Durham University
A. Noutsos - Durham University
K.J. Orford - Max Planck Innovation
J.L. Osborne - Max Planck Society
M. Ouchrif - Laboratoire de Physique Nucléaire et de Hautes Énergies
M. Panter - Max Planck Institute for Nuclear Physics
G. Pelletier - Centre National de la Recherche Scientifique
S. Pita - Centre National de la Recherche Scientifique
G. Puhlhofer - Max Planck Innovation
M. Punch - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
B.C. Raubenheimer - North-West University
M. Raue - Universität Hamburg
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 - A. Alikhanyan National Laboratory
L. Sauge - Centre National de la Recherche Scientifique
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 - Centre de Gestion Scientifique
D. Spangler - Durham University
R. Steenkamp - University of Namibia
C. Stegmann - Humboldt-Universität zu Berlin
G. Superina - École Polytechnique
J.-P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. Terrier - Observatoire de Paris
C.G. Theoret - Centre National de la Recherche Scientifique
M. Tluczykont - Laboratoire Leprince-Ringuet
C. van Eldik - Centre de Gestion Scientifique
G. Vasileiadis - Institut National de Physique Nucléaire et de Physique des Particules
C. Venter - North-West University
P. Vincent - Laboratoire de Physique Nucléaire et de Hautes Énergies
H.J. Volk
S.J. Wagner
M. Ward
Détails de publication: Astronomy & Astrophysics - A&A, Vol.448, pp.L19-L23
Identifiants: 99150617509311
Unité académique: Université de Montpellier
Langue: English
Type de ressource: Journal article
Champs locaux: in2p3-00025548