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Journal Articles The Astrophysical journal letters Year : 2014

Discovery of the hard spectrum VHE gamma-ray source HESS J1641-463

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A. Abramowski
  • Function : Author
F. Aharonian
F. Ait Benkhali
  • Function : Author
A. G. Akhperjanian
  • Function : Author
E. O. Angüner
  • Function : Author
M. Backes
S. Balenderan
  • Function : Author
Agnès Balzer
  • Function : Author
A. Barnacka
  • Function : Author
Y. Becherini
  • Function : Author
J. Becker Tjus
  • Function : Author
D. Berge
S. Bernhard
  • Function : Author
K. Bernlöhr
E. Birsin
  • Function : Author
M. Böttcher
C. Boisson
P. Bordas
  • Function : Author
J. Bregeon
F. Brun
M. Bryan
  • Function : Author
T. Bulik
  • Function : Author
S. Carrigan
  • Function : Author
S. Casanova
P. M. Chadwick
  • Function : Author
N. Chakraborty
  • Function : Author
R. C. G. Chaves
  • Function : Author
S. Colafrancesco
  • Function : Author
G. Cologna
  • Function : Author
J. Conrad
  • Function : Author
Y. Cui
  • Function : Author
I. D. Davids
  • Function : Author
C. Deil
  • Function : Author
P. Dewilt
  • Function : Author
W. Domainko
  • Function : Author
A. Donath
L. O'C. Drury
  • Function : Author
G. Dubus
K. Dutson
  • Function : Author
J. Dyks
  • Function : Author
M. Dyrda
  • Function : Author
T. Edwards
  • Function : Author
K. Egberts
  • Function : Author
P. Eger
  • Function : Author
C. Farnier
  • Function : Author
S. Fegan
M. V. Fernandes
  • Function : Author
A. Fiasson
A. Förster
  • Function : Author
M. Füssling
  • Function : Author
M. Gajdus
  • Function : Author
G. Giavitto
J. F. Glicenstein
  • Function : Author
D. Gottschall
  • Function : Author
M. -H. Grondin
  • Function : Author
M. Grudzińska
  • Function : Author
D. Hadasch
S. Häffner
  • Function : Author
J. Hahn
  • Function : Author
J. Harris
  • Function : Author
G. Heinzelmann
  • Function : Author
G. Henri
  • Function : Author
G. Hermann
  • Function : Author
A. Hillert
  • Function : Author
J. A. Hinton
  • Function : Author
W. Hofmann
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P. Hofverberg
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M. Holler
  • Function : Author
D. Horns
A. Ivascenko
  • Function : Author
C. Jahn
  • Function : Author
M. Jamrozy
M. Janiak
  • Function : Author
F. Jankowsky
  • Function : Author
I. Jung-Richardt
  • Function : Author
M. A. Kastendieck
  • Function : Author
K. Katarzyński
  • Function : Author
U. Katz
S. Kaufmann
  • Function : Author
S. Klepser
D. Klochkov
  • Function : Author
W. Kluźniak
  • Function : Author
D. Kolitzus
  • Function : Author
K. Kosack
S. Krakau
  • Function : Author
P. P. Krüger
  • Function : Author
H. Laffon
  • Function : Author
J. Lau
  • Function : Author
V. Lefranc
  • Function : Author
M. Lemoine-Goumard
T. Lohse
A. Lopatin
  • Function : Author
C. -C. Lu
  • Function : Author
V. Marandon
R. Marx
N. Maxted
  • Function : Author
M. Mayer
  • Function : Author
T. J. L. Mccomb
  • Function : Author
P. J. Meintjes
  • Function : Author
U. Menzler
  • Function : Author
M. Meyer
  • Function : Author
A. M. W. Mitchell
  • Function : Author
R. Moderski
  • Function : Author
M. Mohamed
  • Function : Author
K. Morå
  • Function : Author
Emmanuel Moulin
T. Murach
M. de Naurois
J. Niemiec
S. J. Nolan
  • Function : Author
L. Oakes
  • Function : Author
H. Odaka
  • Function : Author
S. Ohm
B. Opitz
  • Function : Author
M. Ostrowski
I. Oya
  • Function : Author
M. Panter
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R. D. Parsons
  • Function : Author
M. Paz Arribas
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N. W. Pekeur
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G. Pelletier
  • Function : Author
P. -O. Petrucci
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B. Peyaud
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H. Poon
  • Function : Author
G. Pühlhofer
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M. Punch
A. Quirrenbach
  • Function : Author
S. Raab
  • Function : Author
A. Reimer
O. Reimer
  • Function : Author
R. de Los Reyes
  • Function : Author
F. Rieger
C. Romoli
G. Rowell
B. Rudak
V. Sahakian
  • Function : Author
D. Salek
  • Function : Author
A. Santangelo
R. Schlickeiser
  • Function : Author
F. Schüssler
A. Schulz
  • Function : Author
U. Schwanke
S. Schwarzburg
  • Function : Author
S. Schwemmer
  • Function : Author
F. Spanier
  • Function : Author
G. Spengler
  • Function : Author
F. Spies
  • Function : Author
{ł. } Stawarz
  • Function : Author
R. Steenkamp
  • Function : Author
C. Stegmann
  • Function : Author
F. Stinzing
  • Function : Author
K. Stycz
  • Function : Author
I. Sushch
  • Function : Author
A. M. Taylor
  • Function : Author
M. Tluczykont
  • Function : Author
K. Valerius
  • Function : Author
C. van Eldik
B. van Soelen
J. Veh
  • Function : Author
C. Venter
A. Viana
  • Function : Author
J. Vink
H. J. Völk
  • Function : Author
F. Volpe
  • Function : Author
M. Vorster
  • Function : Author
T. Vuillaume
  • Function : Author
S. J. Wagner
  • Function : Author
P. Wagner
  • Function : Author
R. M. Wagner
  • Function : Author
M. Ward
  • Function : Author
M. Weidinger
  • Function : Author
Q. Weitzel
  • Function : Author
R. White
  • Function : Author
A. Wierzcholska
P. Willmann
  • Function : Author
A. Wörnlein
  • Function : Author
D. Wouters
  • Function : Author
R. Yang
  • Function : Author
V. Zabalza
  • Function : Author
D. Zaborov
  • Function : Author
M. Zacharias
A. A. Zdziarski
  • Function : Author
A. Zech
H. -S. Zechlin
  • Function : Author
Y. Fukui
  • Function : Author
H. Sano
  • Function : Author
T. Fukuda
  • Function : Author
S. Yoshiike
  • Function : Author

Abstract

This letter reports the discovery of a remarkably hard spectrum source, HESS J1641-463, by the High Energy Stereoscopic System (H.E.S.S.) in the very-high energy (VHE) domain. HESS J1641-463 remained unnoticed by the usual analysis techniques due to confusion with the bright nearby source HESS J1640-465. It emerged at a significance level of 8.5 standard deviations after restricting the analysis to events with energies above 4 TeV. It shows a moderate flux level of F(E > 1 TeV) = (3.64 +/- 0.44_stat +/- 0.73_sys) x 10^-13 cm^-2s-1, corresponding to 1.8% of the Crab Nebula flux above the same energy, and a hard spectrum with a photon index of Gamma = 2.07 +/- 0.11_stat +/- 0.20_sys. It is a point-like source, although an extension up to Gaussian width of sigma = 0.05 deg cannot be discounted due to uncertainties in the H.E.S.S. PSF. The VHE gamma-ray flux of HESS J1641-463 is found to be constant over the observed period when checking time binnings from year-by-year to the 28 min exposures timescales. HESS J1641-463 is positionally coincident with the radio supernova remnant SNR G338.5+0.1. No X-ray candidate stands out as a clear association, however Chandra and XMM-Newton data reveal some potential weak counterparts. Various VHE gamma-ray production scenarios are discussed. If the emission from HESS J1641-463 is produced by cosmic ray protons colliding with the ambient gas, then their spectrum must extend up to at least a few hundred TeV. The energy released in accelerating these particles could account for the entire energy budget of the galactic cosmic ray population above a few TeV.

Dates and versions

in2p3-01061876 , version 1 (08-09-2014)

Identifiers

Cite

A. Abramowski, F. Aharonian, F. Ait Benkhali, A. G. Akhperjanian, E. O. Angüner, et al.. Discovery of the hard spectrum VHE gamma-ray source HESS J1641-463. The Astrophysical journal letters, 2014, 794 (1), pp.L1. ⟨10.1088/2041-8205/794/1/L1⟩. ⟨in2p3-01061876⟩
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