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Journal Articles Astronomy and Astrophysics - A&A Year : 2008

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

F. Aharonian , A.G. Akhperjanian , U. Barres de Almeida , A.R. Bazer-Bachi (1) , B. Behera , M. Beilicke , W. Benbow , K. Bernlohr , C. Boisson (2) , O. Bolz , V. Borrel (1) , I. Braun , E. Brion (3) , A.M. Brown , R. Buhler , T. Bulik , I. Busching , T. Boutelier (4) , S. Carrigan , P.M. Chadwick , L.-M. Chounet (5) , A.C. Clapson , G. Coignet (6) , R. Cornils , L. Costamante , M. Dalton , B. Degrange (5) , H.J. Dickinson , A. Djannati-Ataï (7) , W. Domainko , L.O'C. Drury , F. Dubois (6) , G. Dubus (4) , J. Dyks , K. Egberts , D. Emmanoulopoulos , P. Espigat (8) , C. Farnier (9) , F. Feinstein (9) , A. Fiasson (9) , A. Forster , G. Fontaine (5) , Seb. Funk , M. Fusling , Y.A. Gallant (9) , B. Giebels (5) , J.F. Glicenstein (3) , B. Gluck , P. Goret (3) , C. Hadjichristidis , D. Hauser , M. Hauser , G. Heinzelmann , G. Henri (4) , G. Hermann , J.A. Hinton , A. Hoffmann , W. Hofmann , M. Holleran , S. Hoppe , D. Horns , A. Jacholkowska (9) , O.C. de Jager , I. Jung , K. Katarzynski , E. Kendziorra , M. Kerschhaggl , B. Khelifi (5) , D. Keogh , Nu. Komin (9) , K. Kosack , G. Lamanna (6) , I.J. Latham , A. Lemiere (8) , M. Lemoine-Goumard (5) , J.-P. Lenain (2) , T. Lohse , J.M. Martin (2) , O. Martineau-Huynh (10) , A. Marcowith (9) , C. Masterson , D. Maurin (10) , G. Maurin (8) , T.J.L. Mccomb , R. Moderski , Emmanuel Moulin (3) , M. de Naurois (10) , D. Nedbal , S.J. Nolan , S. Ohm , J.-P. Olive (1) , E. de Ona Wilhelmi (8) , K.J. Orford , J.L. Osborne , M. Ostrowski , M. Panter , G. Pedaletti , G. Pelletier (4) , P.-O. Petrucci (4) , S. Pita (8) , G. Puhlhofer , M. Punch (8) , S. Ranchon (6) , B.C. Raubenheimer , M. Raue , S.M. Rayner , M. Renaud , J. Ripken , L. Rob , L. Rolland (3) , S. Rosier-Lees (6) , 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 (2) , D. Spangler , L. Stawarz , R. Steenkamp , C. Stegmann , G. Superina (5) , P.H. Tam , J.-P. Tavernet (10) , R. Terrier (8) , C. van Eldik , G. Vasileiadis (9) , C. Venter , J.P. Vialle (6) , P. Vincent (10) , M. Vivier (3) , H.J. Volk , F. Volpe (5) , S.J. Wagner , M. Ward , A.A. Zdziarski , A. Zech (2)
F. Aharonian
A.G. Akhperjanian
  • Function : Author
U. Barres de Almeida
B. Behera
  • Function : Author
M. Beilicke
  • Function : Author
W. Benbow
  • Function : Author
K. Bernlohr
  • Function : Author
C. Boisson
O. Bolz
  • Function : Author
I. Braun
  • Function : Author
A.M. Brown
  • Function : Author
R. Buhler
  • Function : Author
T. Bulik
  • Function : Author
I. Busching
  • Function : Author
S. Carrigan
  • Function : Author
P.M. Chadwick
  • Function : Author
A.C. Clapson
  • Function : Author
R. Cornils
  • Function : Author
L. Costamante
  • Function : Author
M. Dalton
  • Function : Author
H.J. Dickinson
  • Function : Author
W. Domainko
  • Function : Author
L.O'C. Drury
  • Function : Author
F. Dubois
  • Function : Author
  • PersonId : 879245
  • IdRef : 14950232X
G. Dubus
J. Dyks
  • Function : Author
K. Egberts
  • Function : Author
D. Emmanoulopoulos
  • Function : Author
A. Forster
  • Function : Author
Seb. Funk
  • Function : Author
M. Fusling
  • Function : Author
B. Gluck
  • Function : Author
C. Hadjichristidis
  • Function : Author
D. Hauser
  • Function : Author
M. Hauser
  • Function : Author
G. Heinzelmann
  • Function : Author
G. Hermann
  • Function : Author
J.A. Hinton
  • Function : Author
A. Hoffmann
  • Function : Author
W. Hofmann
  • Function : Author
M. Holleran
  • Function : Author
S. Hoppe
  • Function : Author
D. Horns
O.C. de Jager
  • Function : Author
I. Jung
K. Katarzynski
  • Function : Author
E. Kendziorra
  • Function : Author
M. Kerschhaggl
  • Function : Author
B. Khelifi
D. Keogh
  • Function : Author
K. Kosack
I.J. Latham
  • Function : Author
M. Lemoine-Goumard
J.-P. Lenain
T. Lohse
C. Masterson
  • Function : Author
T.J.L. Mccomb
  • Function : Author
R. Moderski
  • Function : Author
D. Nedbal
  • Function : Author
S.J. Nolan
  • Function : Author
S. Ohm
K.J. Orford
  • Function : Author
J.L. Osborne
  • Function : Author
M. Ostrowski
M. Panter
  • Function : Author
G. Pedaletti
  • Function : Author
G. Puhlhofer
  • Function : Author
M. Punch
B.C. Raubenheimer
  • Function : Author
M. Raue
  • Function : Author
S.M. Rayner
  • Function : Author
M. Renaud
  • Function : Author
J. Ripken
  • Function : Author
L. Rob
  • Function : Author
G. Rowell
B. Rudak
J. Ruppel
  • Function : Author
V. Sahakian
  • Function : Author
A. Santangelo
R. Schlickeiser
  • Function : Author
F. Schock
  • Function : Author
R. Schroder
  • Function : Author
U. Schwanke
S. Schwarzburg
  • Function : Author
S. Schwemmer
  • Function : Author
A. Shalchi
  • Function : Author
D. Spangler
  • Function : Author
L. Stawarz
  • Function : Author
R. Steenkamp
  • Function : Author
C. Stegmann
  • Function : Author
P.H. Tam
  • Function : Author
C. van Eldik
C. Venter
H.J. Volk
  • Function : Author
S.J. Wagner
  • Function : Author
M. Ward
  • Function : Author
A.A. Zdziarski
  • Function : Author
A. Zech

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.

Dates and versions

in2p3-00189509 , version 1 (29-02-2008)

Identifiers

Cite

F. Aharonian, A.G. Akhperjanian, U. Barres de Almeida, A.R. Bazer-Bachi, B. Behera, et al.. Upper Limits from HESS active galactic nuclei Observations in 2005-2007. Astronomy and Astrophysics - A&A, 2008, 478, pp.387-393. ⟨10.1051/0004-6361:20078604⟩. ⟨in2p3-00189509⟩
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