HESS Observations and VLT Spectroscopy of PG 1553+113

F. Aharonian; A.G. Akhperjanian; U. Barres de Almeida; A.R. Bazer-Bachi; B. Behera; M. Beilicke; W. Benbow; K. Bernlohr; C. Boisson; O. Bolz; V. Borrel; I. Braun; E. Brion; A.M. Brown; R. Buhler; T. Bulik; I. Busching; T. Boutelier; S. Carrigan; P.M. Chadwick; L.-M. Chounet; A.C. Clapson; G. Coignet; R. Cornils; L. Costamante; M. Dalton; B. Degrange; H.J. Dickinson; A. Djannati-Ataï; W. Domainko; L.O'C. Drury; F. Dubois; G. Dubus; J. Dyks; K. Egberts; D. Emmanoulopoulos; P. Espigat; C. Farnier; F. Feinstein; A. Fiasson; A. Forster; G. Fontaine; Seb. Funk; M. Fusling; Y.A. Gallant; B. Giebels; J.F. Glicenstein; B. Gluck; P. Goret; C. Hadjichristidis; D. Hauser; M. Hauser; 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; E. Kendziorra; M. Kerschhaggl; B. Khelifi; D. Keogh; Nu. Komin; K. Kosack; G. Lamanna; I.J. Latham; A. Lemiere; M. Lemoine-Goumard; J.-P. Lenain; T. Lohse; J.M. Martin; O. Martineau-Huynh; A. Marcowith; C. Masterson; D. Maurin; G. Maurin; T.J.L. Mccomb; R. Moderski; Emmanuel Moulin; M. de Naurois; D. Nedbal; S.J. Nolan; S. Ohm; J.-P. Olive; E. de Ona Wilhelmi; K.J. Orford; J.L. Osborne; M. Ostrowski; M. Panter; G. Pedaletti; G. Pelletier; P.-O. Petrucci; S. Pita; G. Puhlhofer; M. Punch; S. Ranchon; B.C. Raubenheimer; M. Raue; S.M. Rayner; M. Renaud; J. Ripken; L. Rob; L. Rolland; S. Rosier-Lees; G. Rowell; B. Rudak; J. Ruppel; V. Sahakian; A. Santangelo; R. Schlickeiser; F. Schock; R. Schroder; U. Schwanke; S. Schwarzburg; S. Schwemmer; A. Shalchi; H. Sol; D. Spangler; L. Stawarz; R. Steenkamp; C. Stegmann; G. Superina; P.H. Tam; J.-P. Tavernet; R. Terrier; C. van Eldik; G. Vasileiadis; C. Venter; J.P. Vialle; P. Vincent; M. Vivier; H.J. Volk; F. Volpe; S.J. Wagner; M. Ward; A.A. Zdziarski; A. Zech

doi:10.1051/0004-6361:20078603

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HESS Observations and VLT Spectroscopy of PG 1553+113

Journal article

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HESS Observations and VLT Spectroscopy of PG 1553+113

F. Aharonian, A.G. Akhperjanian, U. Barres de Almeida, A.R. Bazer-Bachi, B. Behera, M. Beilicke, W. Benbow, K. Bernlohr, C. Boisson, O. Bolz, …

Astronomy & Astrophysics - A&A, Vol.477, pp.481-489

2008

DOI: https://doi.org/10.1051/0004-6361:20078603

Abstract

Astrophysics

AIMS: The properties of the very high energy (VHE; E>100 GeV) gamma-ray emission from the high-frequency peaked BL Lac PG 1553+113 are investigated. An attempt is made to measure the currently unknown redshift of this object. METHODS: VHE Observations of PG 1553+113 were made with the High Energy Stereoscopic System (HESS) in 2005 and 2006. H+K (1.45-2.45 micron) spectroscopy of PG 1553+113 was performed in March 2006 with SINFONI, an integral field spectrometer of the ESO Very Large Telescope (VLT) in Chile. RESULTS: A VHE signal, ~10 standard deviations, is detected by HESS during the 2 years of observations (24.8 hours live time). The integral flux above 300 GeV is (4.6 +- 0.6{stat} +- 0.9{syst}) x 10^{-12} cm^{-2} s^{-1}, corresponding to ~3.4% of the flux from the Crab Nebula above the same threshold. The time-averaged energy spectrum is measured from 225 GeV to ~1.3 TeV, and is characterized by a very soft power law (photon index of Gamma = 4.5 +- 0.3{stat} +- 0.1{syst}). No evidence for any flux or spectral variations is found on any sampled time scale within the VHE data. The redshift of PG 1553+113 could not be determined. Indeed, even though the measured SINFONI spectrum is the most sensitive ever reported for this object at near infrared wavelengths, and the sensitivity is comparable to the best spectroscopy at other wavelengths, no absorption or emission lines were found in the H+K spectrum presented here.

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Title: HESS Observations and VLT Spectroscopy of PG 1553+113
Creators - without role: F. Aharonian - Dublin Institute For Advanced Studies
A.G. Akhperjanian - A. Alikhanyan National Laboratory
U. Barres de Almeida
A.R. Bazer-Bachi - Université Toulouse III - Paul Sabatier
B. Behera - Heidelberg University
M. Beilicke - Universität Hamburg
W. Benbow - Max Planck Innovation
K. Bernlohr - Humboldt-Universität zu Berlin
C. Boisson - Laboratoire Univers et Théories
O. Bolz - Max Planck Innovation
V. Borrel - Université Toulouse III - Paul Sabatier
I. Braun - Max Planck Innovation
E. Brion - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
A.M. Brown - Durham University
R. Buhler - Max Planck Innovation
T. Bulik - Nicolaus Copernicus Astronomical Center
I. Busching - North-West University
T. Boutelier - Université Joseph Fourier
S. Carrigan - Max Planck Innovation
P.M. Chadwick - Durham University
L.-M. Chounet - Laboratoire Leprince-Ringuet
A.C. Clapson - Max Planck Society
G. Coignet - Laboratoire d’Annecy de Physique des Particules
R. Cornils - Universität Hamburg
L. Costamante - Max Planck Innovation
M. Dalton - Humboldt-Universität zu Berlin
B. Degrange - École Polytechnique
H.J. Dickinson - Durham University
A. Djannati-Ataï - APC - Astrophysique des Hautes Energies
W. Domainko - Max Planck Society
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
K. Egberts - Max Planck Innovation
D. Emmanoulopoulos - Heidelberg University
P. Espigat - Université Paris Cité
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. Forster - Max Planck Society
G. Fontaine - Laboratoire Leprince-Ringuet
Seb. Funk - Humboldt-Universität zu Berlin
M. Fusling
Y.A. Gallant - Institut National de Physique Nucléaire et de Physique des Particules
B. Giebels - Laboratoire Leprince-Ringuet
J.F. Glicenstein - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
B. Gluck - Friedrich-Alexander-Universität Erlangen-Nürnberg
P. Goret - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
C. Hadjichristidis - Durham University
D. Hauser - Max Planck Innovation
M. Hauser - Heidelberg University
G. Heinzelmann - Universität Hamburg
G. Henri - Centre National de la Recherche Scientifique
G. Hermann - Max Planck Innovation
J.A. Hinton - University of Leeds
A. Hoffmann - University of Tübingen
W. Hofmann - Max Planck Innovation
M. Holleran - North-West University
S. Hoppe - Max Planck Society
D. Horns - University of Tübingen
A. Jacholkowska - Laboratoire de Physique Théorique
O.C. de Jager - North-West University
I. Jung - Friedrich-Alexander-Universität Erlangen-Nürnberg
K. Katarzynski
E. Kendziorra - University of Tübingen
M. Kerschhaggl - Humboldt-Universität zu Berlin
B. Khelifi - École Polytechnique
D. Keogh - Durham University
Nu. Komin - Institut National de Physique Nucléaire et de Physique des Particules
K. Kosack - Max Planck Innovation
G. Lamanna - Laboratoire d’Annecy de Physique des Particules
I.J. Latham - Durham University
A. Lemiere - Observatoire de Paris
M. Lemoine-Goumard - École Polytechnique
J.-P. Lenain - Laboratoire Univers et Théories
T. Lohse - Humboldt-Universität zu Berlin
J.M. Martin - Laboratoire Univers et Théories
O. Martineau-Huynh - Laboratoire de Physique Nucléaire et de Hautes Énergies
A. Marcowith - Université de Montpellier
C. Masterson - Dublin Institute For Advanced Studies
D. Maurin - Sorbonne Université
G. Maurin - Observatoire de Paris
T.J.L. Mccomb - Durham University
R. Moderski - Nicolaus Copernicus Astronomical Center
Emmanuel Moulin - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
M. de Naurois - Sorbonne Université
D. Nedbal - Charles University
S.J. Nolan - Durham University
S. Ohm - Max Planck Innovation
J.-P. Olive - Laboratoire d'Analyse et d'Architecture des Systèmes
E. de Ona Wilhelmi - Observatoire de Paris
K.J. Orford - Durham University
J.L. Osborne - Durham University
M. Ostrowski - Jagiellonian University
M. Panter - Max Planck Society
G. Pedaletti - Heidelberg University
G. Pelletier - Centre National de la Recherche Scientifique
P.-O. Petrucci - Université Joseph Fourier
S. Pita - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
G. Puhlhofer - Heidelberg University
M. Punch - Observatoire de Paris
S. Ranchon - Laboratoire d’Annecy de Physique des Particules
B.C. Raubenheimer - North-West University
M. Raue - Universität Hamburg
S.M. Rayner - Durham University
M. Renaud - Max Planck Innovation
J. Ripken - Universität Hamburg
L. Rob - Charles University
L. Rolland - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
S. Rosier-Lees - Laboratoire d’Annecy de Physique des Particules
G. Rowell - University of Adelaide
B. Rudak - Nicolaus Copernicus Astronomical Center
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
H. Sol - Laboratoire Univers et Théories
D. Spangler - Durham University
L. Stawarz
R. Steenkamp - University of Namibia
C. Stegmann - Friedrich-Alexander-Universität Erlangen-Nürnberg
G. Superina - École Polytechnique
P.H. Tam - Heidelberg University
J.-P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. Terrier - Centre National de la Recherche Scientifique
C. van Eldik - Max Planck Innovation
G. Vasileiadis - Université de Montpellier
C. Venter - North-West University
J.P. Vialle - Institut National de Physique Nucléaire et de Physique des Particules
P. Vincent - Sorbonne Université
M. Vivier - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
H.J. Volk - Max Planck Society
F. Volpe - École Polytechnique
S.J. Wagner - Heidelberg University
M. Ward - Durham University
A.A. Zdziarski - Nicolaus Copernicus Astronomical Center
A. Zech - Laboratoire Univers et Théories
Publication Details: Astronomy & Astrophysics - A&A, Vol.477, pp.481-489
Identifiers: 9936972309311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00184500