New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200 - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2007

New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200

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-Atai (7) , W. Domainko , L.O'C. Drury , F. Dubois , G. Dubus (4) , J. Dyks , K. Egberts , D. Emmanoulopoulos , P. Espigat (7) , C. Farnier (8) , F. Feinstein (8) , A. Fiasson (8) , A. Forster , G. Fontaine (5) , Seb. Funk , M. Fusling , Y.A. Gallant (8) , 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 (8) , O.C. de Jager , I. Jung , K. Katarzynski , E. Kendziorra , M. Kerschhaggl , B. Khelifi (5) , D. Keogh , Nu. Komin (8) , K. Kosack , G. Lamanna (6) , I.J. Latham , A. Lemiere (7) , M. Lemoine-Goumard (5) , J.-P. Lenain (2) , T. Lohse , J.M. Martin (2) , O. Martineau-Huynh (9) , A. Marcowith (8) , C. Masterson , D. Maurin (9) , G. Maurin (7) , T.J.L. Mccomb , R. Moderski , Emmanuel Moulin (3) , M. de Naurois (9) , D. Nedbal , S.J. Nolan , S. Ohm , J.-P. Olive (1) , E. de Ona Wilhelmi (7) , K.J. Orford , J.L. Osborne , M. Ostrowski , M. Panter , G. Pedaletti , G. Pelletier (4) , P.-O. Petrucci (4) , S. Pita (10) , G. Puhlhofer , M. Punch (10) , 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 (9) , R. Terrier (10) , C. van Eldik , G. Vasileiadis (8) , C. Venter , J.P. Vialle (6) , P. Vincent (9) , 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:To investigate the very high energy (VHE: >100 GeV) γ-ray emission from the high-frequency peaked BL Lac 1ES 0229+200. Methods: Observations of 1ES 0229+200 at energies above 580 GeV were performed with the High Energy Stereoscopic System (HESS) in 2005 and 2006. Results: 1ES 0229+200 is discovered by HESS to be an emitter of VHE photons. A signal is detected at the 6.6σ level in the HESS observations (41.8 h live time). The integral flux above 580 GeV is (9.4±1.5_stat±1.9_syst) × 10-13 cm-2 s-1, corresponding to ~1.8% of the flux observed from the Crab Nebula. The data show no evidence for significant variability on any time scale. The observed spectrum is characterized by a hard power law (Γ = 2.50±0.19_stat±0.10_syst) from 500 GeV to ~15 TeV. Conclusions: The high-energy range and hardness of the observed spectrum, coupled with the object's relatively large redshift (z = 0.1396), enable the strongest constraints so far on the density of the Extragalactic Background Light (EBL) in the mid-infrared band. Assuming that the emitted spectrum is not harder than Γ_int ≈ 1.5, the HESS data support an EBL spectrum ∝λ-1 and density close to the lower limit from source counts measured by Spitzer, confirming the previous indications from the HEGRA data of 1ES 1426+428 (z=0.129). Irrespective of the EBL models used, the intrinsic spectrum of 1ES 0229+200 is hard, thus locating the high-energy peak of its spectral energy distribution above a few TeV.

Dates and versions

in2p3-00175791 , version 1 (01-10-2007)

Identifiers

Cite

F. Aharonian, A.G. Akhperjanian, U. Barres de Almeida, A.R. Bazer-Bachi, B. Behera, et al.. New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200. Astronomy and Astrophysics - A&A, 2007, 475, pp.L9-L13. ⟨10.1051/0004-6361:20078462⟩. ⟨in2p3-00175791⟩
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