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Journal Articles Astronomy and Astrophysics - A&A Year : 2011

Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array

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A. Abramowski
  • Function : Author
F. Aharonian
A. G. Akhperjanian
  • Function : Author
G. Anton
  • Function : Author
A. Barnacka
  • Function : Author
U. Barres de Almeida
  • Function : Author
J. Becker
  • Function : Author
B. Behera
  • Function : Author
K. Bernlöhr
A. Bochow
  • Function : Author
C. Boisson
P. Bordas
  • Function : Author
J. Brucker
  • Function : Author
T. Bulik
  • Function : Author
I. Büsching
  • Function : Author
S. Casanova
M. Cerruti
P. M. Chadwick
  • Function : Author
R. C. G. Chaves
  • Function : Author
A. Cheesebrough
  • Function : Author
J. Conrad
  • Function : Author
A. C. Clapson
  • Function : Author
M. Dalton
  • Function : Author
M. K. Daniel
  • Function : Author
I. D. Davids
  • Function : Author
C. Deil
  • Function : Author
H. J. Dickinson
  • Function : Author
W. Domainko
  • Function : Author
L. O'C. Drury
  • Function : Author
J. Dyks
  • Function : Author
M. Dyrda
  • Function : Author
K. Egberts
  • Function : Author
P. Eger
  • Function : Author
L. Fallon
  • Function : Author
S. Fegan
M. V. Fernandes
  • Function : Author
A. Fiasson
A. Förster
  • Function : Author
M. Füssling
  • Function : Author
D. Gerbig
  • Function : Author
B. Glück
  • Function : Author
D. Göring
  • Function : Author
J. D. Hague
  • Function : Author
D. Hampf
  • Function : Author
M. Hauser
  • Function : Author
S. Heinz
  • Function : Author
G. Heinzelmann
  • Function : Author
G. Hermann
  • Function : Author
J. A. Hinton
  • Function : Author
A. Hoffmann
  • Function : Author
W. Hofmann
  • Function : Author
P. Hofverberg
  • Function : Author
M. Holleran
  • Function : Author
S. Hoppe
  • Function : Author
D. Horns
O. C. de Jager
  • Function : Author
C. Jahn
  • Function : Author
I. Jung
K. Katarzyński
  • Function : Author
U. Katz
S. Kaufmann
  • Function : Author
M. Kerschhaggl
  • Function : Author
D. Khangulyan
B. Khélifi
D. Keogh
  • Function : Author
D. Klochkov
  • Function : Author
W. Kluźniak24
  • Function : Author
T. Kneiske
  • Function : Author
J. -P. Lenain
D. Lennarz
  • Function : Author
T. Lohse
C. -C. Lu
  • Function : Author
V. Marandon
Julien Masbou
T. J. L. Mccomb
  • Function : Author
M. C. Medina
  • Function : Author
R. Moderski
  • Function : Author
M. Naumann-Godo
  • Function : Author
D. Nedbal
  • Function : Author
D. Nekrassov
  • Function : Author
N. Nguyen
  • Function : Author
B. Nicholas
  • Function : Author
J. Niemiec
S. J. Nolan
  • Function : Author
S. Ohm
E. de Oña Wilhelmi
  • Function : Author
B. Opitz
  • Function : Author
K. J. Orford
  • Function : Author
M. Ostrowski
M. Panter
  • Function : Author
M. Paz Arribas
  • Function : Author
G. Pedaletti1
  • Function : Author
G. Pühlhofer
  • Function : Author
M. Punch
A. Quirrenbach
  • Function : Author
M. Raue
  • Function : Author
S. M. Rayner
  • Function : Author
A. Reimer
O. Reimer
  • Function : Author
R. de Los Reyes
  • Function : Author
F. Rieger1
  • Function : Author
J. Ripken
  • Function : Author
G. Rowell
B. Rudak
C. B. Rulten
  • Function : Author
J. Ruppel
  • Function : Author
F. Ryde
  • Function : Author
V. Sahakian
  • Function : Author
A. Santangelo
R. Schlickeiser
  • Function : Author
F. M. Schöck
  • Function : Author
A. Schönwald
  • Function : Author
U. Schwanke
S. Schwarzburg
  • Function : Author
S. Schwemmer
  • Function : Author
A. Shalchi
  • Function : Author
I. Sushch
  • Function : Author
M. Sikora
  • Function : Author
J. L. Skilton
  • Function : Author
G. Spengler
  • Function : Author
Ł. Stawarz
  • Function : Author
R. Steenkamp
  • Function : Author
C. Stegmann
  • Function : Author
F. Stinzing
  • Function : Author
P. H. Tam
  • Function : Author
O. Tibolla
  • Function : Author
K. Valerius
  • Function : Author
C. van Eldik
C. Venter
A. Viana
  • Function : Author
H. J. Völk
  • Function : Author
S. J. Wagner
  • Function : Author
M. Ward
  • Function : Author
A. A. Zdziarski
  • Function : Author
A. Zech
H. -S. Zechlin
  • Function : Author
Y. Fukui
  • Function : Author
N. Furukawa
  • Function : Author
A. Ohama
  • Function : Author
H. Sano
  • Function : Author
J. Dawson
A. Kawamura
  • Function : Author

Abstract

Aims. Previous observations with the H.E.S.S. telescope array revealed the existence of extended very-high-energy (VHE; E>100 GeV) {\gamma}-ray emission, HESS J1023-575, coincident with the young stellar cluster Westerlund 2. At the time of discovery, the origin of the observed emission was not unambiguously identified, and follow-up observations have been performed to further investigate the nature of this {\gamma}-ray source. Methods. The Carina region towards the open cluster Westerlund 2 has been re-observed, increasing the total exposure to 45.9 h. The combined dataset includes 33 h of new data and now permits a search for energy-dependent morphology and detailed spectroscopy. Results. A new, hard spectrum VHE {\gamma}-ray source, HESSJ1026-582, was discovered with a statistical significance of 7{\sigma}. It is positionally coincident with the Fermi LAT pulsar PSR J1028-5819. The positional coincidence and radio/{\gamma}-ray characteristics of the LAT pulsar favors a scenario where the TeV emission originates from a pulsar wind nebula. The nature of HESS J1023-575 is discussed in light of the deep H.E.S.S. observations and recent multi-wavelength discoveries, including the Fermi LAT pulsar PSRJ1022-5746 and giant molecular clouds in the region. Despite the improved VHE dataset, a clear identification of the object responsible for the VHE emission from HESS J1023-575 is not yet possible, and contribution from the nearby high-energy pulsar and/or the open cluster remains a possibility.

Dates and versions

in2p3-00519435 , version 1 (20-09-2010)

Identifiers

Cite

A. Abramowski, Fabio Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, et al.. Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array. Astronomy and Astrophysics - A&A, 2011, 525, pp.A46. ⟨10.1051/0004-6361/201015290⟩. ⟨in2p3-00519435⟩
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