Upper Limits from HESS active galactic nuclei Observations in 2005-2007

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:10.1051/0004-6361:20078604

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Upper Limits from HESS active galactic nuclei Observations in 2005-2007

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Upper Limits from HESS active galactic nuclei Observations in 2005-2007

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.478, pp.387-393

2008

DOI: https://doi.org/10.1051/0004-6361:20078604

Abstract

AIMS: Very high energy (VHE; E>100 GeV) gamma-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes. METHODS: VHE observations of a sample of 14 AGN, considered candidate VHE emitters, were made with the High Energy Stereoscopic System (HESS) between January 2005 and July 2007. Large-zenith-angle observations of three northern AGN (Mkn 421, Mkn 501, 1ES 1218+304), known to emit VHE gamma rays, were also performed in order to sample their spectral energy distributions (SEDs) above 1 TeV. In addition, the VHE flux from 1ES 1101-232, previously detected by HESS in 2004-2005, was monitored during 2006 and 2007. RESULTS: As significant detections from the HESS observation program are reported elsewhere, the results reported here are primarily integral flux upper limits. The average exposure for each of the 14 VHE-candidate AGN is ~7 h live time, and the observations have an average energy threshold between 230 GeV and 590 GeV. Upper limits for these 14 AGN range from <0.9% to <4.9% of the Crab Nebula flux, and eight of these are the most constraining ever reported for the object. The brief (<2.2 h each) large-zenith-angle observations yield upper limits for Mkn 501 (<20% Crab above 2.5 TeV) and 1ES 1218+304 (<17% Crab above 1.0 TeV), and a marginal detection (3.5 sigma) of Mkn 421 (50% Crab above 2.1 TeV). 1ES 1101-232 was marginally detected (3.6 sigma, 1.7% Crab above 260 GeV) during the 2006 (13.7 h live time) observations, but not in the 2007 (4.6 h live time) data. The upper limit in 2007 (<1.9% Crab above 260 GeV) is below the average flux measured by HESS from 2004-2006.

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Title: Upper Limits from HESS active galactic nuclei Observations in 2005-2007
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 - Délégation Paris 7
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 Society
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 Innovation
G. Coignet - Laboratoire d’Annecy de Physique des Particules
R. Cornils - Universität Hamburg
L. Costamante
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 Society
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 Society
M. Hauser - Heidelberg University
G. Heinzelmann - Universität Hamburg
G. Henri - Centre National de la Recherche Scientifique
G. Hermann - Max Planck Society
J.A. Hinton - University of Leeds
A. Hoffmann - University of Tübingen
W. Hofmann - Max Planck Society
M. Holleran - North-West University
S. Hoppe - Max Planck Innovation
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 - Nicolaus Copernicus University
E. Kendziorra - University of Tübingen
M. Kerschhaggl - Humboldt-Universität zu Berlin
B. Khelifi - Laboratoire Leprince-Ringuet
D. Keogh - Durham University
Nu. Komin - Laboratoire de Physique Théorique
K. Kosack - Max Planck Society
G. Lamanna - Institut National de Physique Nucléaire et de Physique des Particules
I.J. Latham - Durham University
A. Lemiere - Laboratoire AstroParticule et Cosmologie
M. Lemoine-Goumard - École Polytechnique
J.-P. Lenain - Délégation Paris 7
T. Lohse - Humboldt-Universität zu Berlin
J.M. Martin - Délégation Paris 7
O. Martineau-Huynh - Laboratoire de Physique Nucléaire et de Hautes Énergies
A. Marcowith - Institut National de Physique Nucléaire et de Physique des Particules
C. Masterson - Dublin Institute For Advanced Studies
D. Maurin - Laboratoire de Physique Nucléaire et de Hautes Énergies
G. Maurin - Laboratoire AstroParticule et Cosmologie
T.J.L. Mccomb - Durham University
R. Moderski - Nicolaus Copernicus Astronomical Center
Emmanuel Moulin - CEA Paris-Saclay
M. de Naurois - Université Paris Cité
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 - Université Paris Cité
K.J. Orford - Durham University
J.L. Osborne - Durham University
M. Ostrowski - Jagiellonian University
M. Panter - Max Planck Innovation
G. Pedaletti - Heidelberg University
G. Pelletier - Centre National de la Recherche Scientifique
P.-O. Petrucci - Université Joseph Fourier
S. Pita - Université Paris Cité
G. Puhlhofer - Heidelberg University
M. Punch - Laboratoire AstroParticule et Cosmologie
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 Society
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 - Délégation Paris 7
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 - Laboratoire AstroParticule et Cosmologie
C. van Eldik - Max Planck Society
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 Innovation
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.478, pp.387-393
Identifiers: 9936976509311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00189509