Discovery of VHE gamma rays from PKS 2005-489

F. Aharonian; A. G. Akhperjanian; K.-M. Aye; A. R. Bazer-Bachi; M. Beilicke; W. Benbow; D. Berge; P. Berghaus; K. Bernlöhr; C. Boisson; O. Bolz; I. Braun; F. Breitling; A. M. Brown; J. Gordo Bussons; P. M. Chadwick; L.-M. Chounet; R. Cornils; L. Costamante; B. Degrange; A. Djannati-Ataï; Drury L. O'C.; G. Dubus; D. Emmanoulopoulos; P. Espigat; F. Feinstein; P. Fleury; 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; Jager O. C. De; B. Khélifi; Nu. Komin; A. Konopelko; I. J. Latham; Gallou R. Le; A. Lemière; M. Lemoine-Goumard; N. Leroy; T. Lohse; O. Martineau-Huynh; A. Marcowith; C. Masterson; T. J. L. Mccomb; Naurois M. De; 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; I. Redondo; 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; 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:10.1051/0004-6361:200500113

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Discovery of VHE gamma rays from PKS 2005-489

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Discovery of VHE gamma rays from PKS 2005-489

F. Aharonian, A. G. Akhperjanian, K.-M. Aye, A. R. Bazer-Bachi, M. Beilicke, W. Benbow, D. Berge, P. Berghaus, K. Bernlöhr, C. Boisson, …

Astronomy & Astrophysics - A&A, Vol.436, pp.L17-L20

2005

DOI: https://doi.org/10.1051/0004-6361:200500113

Abstract

galaxies: active

BL Lacertae objects: individual: PKS 2005-489

gamma rays: observations

The high-frequency peaked BL Lac PKS 2005-489 (z=0.071) was observed in 2003 and 2004 with the H.E.S.S. stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7 sigma level in the 2004 observations (24.2 hrs live time), but not in the 2003 data set (27.3 h live time). PKS 2005-489 is the first blazar independently discovered by H.E.S.S. to be an emitter of VHE photons, and only the second such blazar in the Southern Hemisphere. The integral flux above 200 GeV observed in 2004 is (6.9$\pm$ 1.0$_{stat} \pm 1.4_{syst}$) x 10$^{-12}$ cm$^{-2}$ s$^{-1}$, corresponding to $\sim$ 2.5% of the flux observed from the Crab Nebula. The 99% upper limit on the flux in 2003, I(>200 GeV) < 5.2 x 10$^{-12}$ cm$^{-2}$ s$^{-1}$, is smaller than the flux measured in 2004, suggesting an increased level of activity in 2004. However, the data show no evidence for significant variability on any time scale less than a year. An energy spectrum is measured and is characterized by a very soft power law (photon index of $\Gamma$= 4.0 $\pm$ 0.4).

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Title: Discovery of VHE gamma rays from PKS 2005-489
Creators - without role: F. Aharonian - Max Planck Institute for Nuclear Physics
A. G. Akhperjanian
K.-M. Aye - Durham University
A. R. Bazer-Bachi
M. Beilicke - Max Planck Institute for Nuclear Physics
W. Benbow - Max Planck Institute for Nuclear Physics
D. Berge - Max Planck Institute for Nuclear Physics
P. Berghaus - Agence Parisienne du Climat
K. Bernlöhr - Max Planck Institute for Nuclear Physics
C. Boisson - Max Planck Institute for Nuclear Physics
O. Bolz - Max Planck Institute for Nuclear Physics
I. Braun - Max Planck Society
F. Breitling - Humboldt-Universität zu Berlin
A. M. Brown
J. Gordo Bussons - Laboratoire de Physique Théorique
P. M. Chadwick
L.-M. Chounet - Laboratoire Leprince-Ringuet
R. Cornils - Hamburg Institut
L. Costamante - Max Planck Institute for Nuclear Physics
B. Degrange - Max Planck Institute for Nuclear Physics
A. Djannati-Ataï - AstroParticule et Cosmologie
Drury L. O'C.
G. Dubus - Max Planck Institute for Nuclear Physics
D. Emmanoulopoulos
P. Espigat - Agence Parisienne du Climat
F. Feinstein - Centre National de la Recherche Scientifique
P. Fleury - Laboratoire Leprince-Ringuet
G. Fontaine - Max Planck Institute for Nuclear Physics
Y. Fuchs - Max Planck Institute for Nuclear Physics
S. Funk - Max Planck Society
Y.A. Gallant - Max Planck Society
B. Giebels - Max Planck Institute for Nuclear Physics
S. Gillessen - Max Planck Institute for Nuclear Physics
J. F. Glicenstein
P. Goret - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
C. Hadjichristidis - Max Planck Institute for Nuclear Physics
M. Hauser - Max Planck Institute for Nuclear Physics
G. Heinzelmann - Max Planck Society
G. Henri - Max Planck Institute for Nuclear Physics
G. Hermann - Max Planck Institute for Nuclear Physics
J. A. Hinton
W. Hofmann - Max Planck Institute for Nuclear Physics
M. Holleran - Max Planck Institute for Nuclear Physics
D. Horns - Max Planck Institute for Nuclear Physics
Jager O. C. De
B. Khélifi - Max Planck Institute for Nuclear Physics
Nu. Komin - Humboldt-Universität zu Berlin
A. Konopelko - Max Planck Institute for Nuclear Physics
I. J. Latham
Gallou R. Le
A. Lemière - Agence Parisienne du Climat
M. Lemoine-Goumard - Max Planck Institute for Nuclear Physics
N. Leroy - Max Planck Institute for Nuclear Physics
T. Lohse - Max Planck Society
O. Martineau-Huynh - Max Planck Institute for Nuclear Physics
A. Marcowith - Université Toulouse III - Paul Sabatier
C. Masterson - Max Planck Institute for Nuclear Physics
T. J. L. Mccomb
Naurois M. De - Laboratoire de Physique Nucléaire et de Hautes Énergies
S. J. Nolan
A. Noutsos
K. J. Orford
J. L. Osborne
M. Ouchrif - Max Planck Institute for Nuclear Physics
M. Panter - Max Planck Institute for Nuclear Physics
G. Pelletier - Max Planck Society
S. Pita - Max Planck Institute for Nuclear Physics
G. Pühlhofer - Max Planck Institute for Nuclear Physics
M. Punch - Max Planck Society
B. C. Raubenheimer
M. Raue - Max Planck Society
J. Raux - Laboratoire de Physique Nucléaire et de Hautes Énergies
S. M. Rayner
I. Redondo - Max Planck Society
A. Reimer - Ruhr University Bochum
O. Reimer - Max Planck Institute for Nuclear Physics
J. Ripken
L. Rob - Max Planck Institute for Nuclear Physics
L. Rolland - Max Planck Institute for Nuclear Physics
G. Rowell - Max Planck Institute for Nuclear Physics
V. Sahakian
L. Saugé - Max Planck Institute for Nuclear Physics
S. Schlenker - Max Planck Institute for Nuclear Physics
R. Schlickeiser
C. Schuster - Max Planck Society
U. Schwanke - Max Planck Institute for Nuclear Physics
M. Siewert - Max Planck Institute for Nuclear Physics
H. Sol
R. Steenkamp - University of Namibia
C. Stegmann - Max Planck Institute for Nuclear Physics
J.-P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. Terrier - AstroParticule et Cosmologie
C.G. Théoret - AstroParticule et Cosmologie
M. Tluczykont - Max Planck Institute for Nuclear Physics
G. Vasileiadis - Max Planck Society
C. Venter - Max Planck Institute for Nuclear Physics
P. Vincent - Laboratoire de Physique Nucléaire et de Hautes Énergies
H. J. Völk
S. J. Wagner
Publication Details: Astronomy & Astrophysics - A&A, Vol.436, pp.L17-L20
Identifiers: 9936213309311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00024315