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

A. Abramowski; Fabio Acero; F. Aharonian; A. G. Akhperjanian; G. Anton; A. Barnacka; U. Barres de Almeida; A. R. Bazer-Bachi; Y. Becherini; J. Becker; B. Behera; K. Bernlöhr; A. Bochow; C. Boisson; J. Bolmont; P. Bordas; V. Borrel; J. Brucker; F. Brun; P. Brun; T. Bulik; I. Büsching; T. Boutelier; S. Casanova; M. Cerruti; P. M. Chadwick; A. Charbonnier; R. C. G. Chaves; A. Cheesebrough; J. Conrad; L. -M. Chounet; A. C. Clapson; G. Coignet; M. Dalton; M. K. Daniel; I. D. Davids; B. Degrange; C. Deil; H. J. Dickinson; A. Djannati-Ataï; W. Domainko; L. O'C. Drury; F. Dubois; G. Dubus; J. Dyks; M. Dyrda; K. Egberts; P. Eger; P. Espigat; L. Fallon; C. Farnier; S. Fegan; F. Feinstein; M. V. Fernandes; A. Fiasson; A. Förster; G. Fontaine; M. Füssling; S. Gabici; Y. A. Gallant; L. Gérard; D. Gerbig; B. Giebels; J. F. Glicenstein; B. Glück; P. Goret; D. Göring; J. D. Hague; D. Hampf; M. Hauser; S. Heinz; G. Heinzelmann; G. Henri; G. Hermann; J. A. Hinton; A. Hoffmann; W. Hofmann; P. Hofverberg; M. Holleran; S. Hoppe; D. Horns; A. Jacholkowska; O. C. de Jager; C. Jahn; I. Jung; K. Katarzyński; U. Katz; S. Kaufmann; M. Kerschhaggl; D. Khangulyan; B. Khélifi; D. Keogh; D. Klochkov; W. Kluźniak24; T. Kneiske; Nu. Komin; K. Kosack; R. Kossakowski; G. Lamanna; J. -P. Lenain; D. Lennarz; T. Lohse; C. -C. Lu; V. Marandon; A. Marcowith; Julien Masbou; D. Maurin; T. J. L. Mccomb; M. C. Medina; J. Méhault; R. Moderski; Emmanuel Moulin; M. Naumann-Godo; M. de Naurois; D. Nedbal; D. Nekrassov; N. Nguyen; B. Nicholas; J. Niemiec; S. J. Nolan; S. Ohm; J-F. Olive; E. de Oña Wilhelmi; B. Opitz; K. J. Orford; M. Ostrowski; M. Panter; M. Paz Arribas; G. Pedaletti; G. Pelletier; P. -O. Petrucci; S. Pita; G. Pühlhofer; M. Punch; A. Quirrenbach; M. Raue; S. M. Rayner; A. Reimer; O. Reimer; M. Renaud; R. de Los Reyes; F. Rieger; J. Ripken; L. Rob; S. Rosier-Lees; G. Rowell; B. Rudak; C. B. Rulten; J. Ruppel; F. Ryde; V. Sahakian; A. Santangelo; R. Schlickeiser; F. M. Schöck; A. Schönwald; U. Schwanke; S. Schwarzburg; S. Schwemmer; A. Shalchi; I. Sushch; M. Sikora; J. L. Skilton; H. Sol; G. Spengler; Ł. Stawarz; R. Steenkamp; C. Stegmann; F. Stinzing; A. Szostek; P. H. Tam; J. -P. Tavernet; R. Terrier; O. Tibolla; M. Tluczykont; K. Valerius; C. van Eldik; G. Vasileiadis; C. Venter; J. P. Vialle; A. Viana; P. Vincent; M. Vivier; H. J. Völk; F. Volpe; S. Vorobiov; S. J. Wagner; M. Ward; A. A. Zdziarski; A. Zech; H. -S. Zechlin; Y. Fukui; N. Furukawa; A. Ohama; H. Sano; J. Dawson; A. Kawamura

doi:10.1051/0004-6361/201015290

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

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

A. Abramowski, Fabio Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, A. Barnacka, U. Barres de Almeida, A. R. Bazer-Bachi, Y. Becherini, J. Becker, …

Astronomy & Astrophysics - A&A, Vol.525

2011

DOI: https://doi.org/10.1051/0004-6361/201015290

Abstract

ISM: HII regions

ISM: individual objects: HESS J1023-575

Gamma-ray: stars

HESS J1026-582

RCW 49 (NGC 3247

G284.3-0.3)

PSRJ1028-5819

PSRJ1022-5746

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.

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Title: Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array
Creators - without role: A. Abramowski - Universität Hamburg
Fabio Acero - Laboratoire de Physique Théorique
F. Aharonian - Dublin Institute For Advanced Studies
A. G. Akhperjanian - National Academy of Sciences of Armenia
G. Anton - Friedrich-Alexander-Universität Erlangen-Nürnberg
A. Barnacka - Nicolaus Copernicus Astronomical Center
U. Barres de Almeida - Durham University
A. R. Bazer-Bachi - Université Toulouse III - Paul Sabatier
Y. Becherini - Université Paris Cité
J. Becker - Ruhr University Bochum
B. Behera - Heidelberg University
K. Bernlöhr - Humboldt-Universität zu Berlin
A. Bochow - Max Planck Institute for Nuclear Physics
C. Boisson - Université Paris Cité
J. Bolmont - Laboratoire de Physique Nucléaire et de Hautes Énergies
P. Bordas - University of Tübingen
V. Borrel - Université Toulouse III - Paul Sabatier
J. Brucker - Friedrich-Alexander-Universität Erlangen-Nürnberg
F. Brun - Laboratoire de Physique Nucléaire et de Hautes Énergies
P. Brun - Institut de Recherche sur les Lois Fondamentales de l'Univers
T. Bulik - University of Warsaw
I. Büsching - North-West University
T. Boutelier - Université Joseph Fourier
S. Casanova - Max Planck Institute for Nuclear Physics
M. Cerruti - Université Paris Cité
P. M. Chadwick - Durham University
A. Charbonnier - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. C. G. Chaves - Max Planck Institute for Nuclear Physics
A. Cheesebrough - Durham University
J. Conrad - Stockholm University
L. -M. Chounet - Laboratoire Leprince-Ringuet
A. C. Clapson - Max Planck Institute for Nuclear Physics
G. Coignet - Laboratoire d’Annecy de Physique des Particules
M. Dalton - Humboldt-Universität zu Berlin
M. K. Daniel - Durham University
I. D. Davids - University of Namibia
B. Degrange - École Polytechnique
C. Deil - Max Planck Institute for Nuclear Physics
H. J. Dickinson - Durham University
A. Djannati-Ataï - APC - Astrophysique des Hautes Energies
W. Domainko - Max Planck Institute for Nuclear Physics
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
M. Dyrda - Institute of Nuclear Physics, Polish Academy of Sciences
K. Egberts - Universität Innsbruck
P. Eger - Friedrich-Alexander-Universität Erlangen-Nürnberg
P. Espigat - Université Paris Cité
L. Fallon - Dublin Institute For Advanced Studies
C. Farnier - Laboratoire de Physique Théorique
S. Fegan - Laboratoire Leprince-Ringuet
F. Feinstein - Laboratoire de Physique Théorique
M. V. Fernandes - Universität Hamburg
A. Fiasson - Laboratoire d’Annecy de Physique des Particules
A. Förster - Max Planck Institute for Nuclear Physics
G. Fontaine - Laboratoire Leprince-Ringuet
M. Füssling
S. Gabici - Dublin Institute For Advanced Studies
Y. A. Gallant - Institut National de Physique Nucléaire et de Physique des Particules
L. Gérard - Université Paris Cité
D. Gerbig - Ruhr University Bochum
B. Giebels - Laboratoire Leprince-Ringuet
J. F. Glicenstein - Commissariat à l'Énergie Atomique et aux Énergies Alternatives
B. Glück - Friedrich-Alexander-Universität Erlangen-Nürnberg
P. Goret - Institut de Recherche sur les Lois Fondamentales de l'Univers
D. Göring - Friedrich-Alexander-Universität Erlangen-Nürnberg
J. D. Hague - Max Planck Institute for Nuclear Physics
D. Hampf - Universität Hamburg
M. Hauser - Heidelberg University
S. Heinz - Friedrich-Alexander-Universität Erlangen-Nürnberg
G. Heinzelmann - Universität Hamburg
G. Henri - Centre National de la Recherche Scientifique
G. Hermann - Max Planck Institute for Nuclear Physics
J. A. Hinton - University of Leicester
A. Hoffmann - University of Tübingen
W. Hofmann - Max Planck Institute for Nuclear Physics
P. Hofverberg - Max Planck Institute for Nuclear Physics
M. Holleran - North-West University
S. Hoppe - Max Planck Institute for Nuclear Physics
D. Horns - Universität Hamburg
A. Jacholkowska - Laboratoire de Physique Nucléaire et de Hautes Énergies
O. C. de Jager - North-West University
C. Jahn - Friedrich-Alexander-Universität Erlangen-Nürnberg
I. Jung - Friedrich-Alexander-Universität Erlangen-Nürnberg
K. Katarzyński - Nicolaus Copernicus University
U. Katz - Friedrich-Alexander-Universität Erlangen-Nürnberg
S. Kaufmann - Heidelberg University
M. Kerschhaggl - Humboldt-Universität zu Berlin
D. Khangulyan - Max Planck Institute for Nuclear Physics
B. Khélifi - École Polytechnique
D. Keogh - Durham University
D. Klochkov - University of Tübingen
W. Kluźniak24
T. Kneiske - Universität Hamburg
Nu. Komin - Institut de Recherche sur les Lois Fondamentales de l'Univers
K. Kosack - Institut de Recherche sur les Lois Fondamentales de l'Univers
R. Kossakowski - Laboratoire d’Annecy de Physique des Particules
G. Lamanna - Institut National de Physique Nucléaire et de Physique des Particules
J. -P. Lenain - Délégation Paris 7
D. Lennarz - Max Planck Institute for Nuclear Physics
T. Lohse - Humboldt-Universität zu Berlin
C. -C. Lu - Max Planck Institute for Nuclear Physics
V. Marandon - Laboratoire AstroParticule et Cosmologie
A. Marcowith - Institut National de Physique Nucléaire et de Physique des Particules
Julien Masbou - Laboratoire d’Annecy de Physique des Particules
D. Maurin - Laboratoire de Physique Nucléaire et de Hautes Énergies
T. J. L. Mccomb - Durham University
M. C. Medina - CEA Paris-Saclay
J. Méhault - Institut National de Physique Nucléaire et de Physique des Particules
R. Moderski - Nicolaus Copernicus Astronomical Center
Emmanuel Moulin - CEA Paris-Saclay
M. Naumann-Godo - CEA Paris-Saclay
M. de Naurois - École Polytechnique
D. Nedbal - Charles University
D. Nekrassov - Max Planck Institute for Nuclear Physics
N. Nguyen - Universität Hamburg
B. Nicholas - University of Adelaide
J. Niemiec - Institute of Nuclear Physics, Polish Academy of Sciences
S. J. Nolan - Durham University
S. Ohm - Max Planck Institute for Nuclear Physics
J-F. Olive - Laboratoire d'Analyse et d'Architecture des Systèmes
E. de Oña Wilhelmi
B. Opitz - Universität Hamburg
K. J. Orford - Durham University
M. Ostrowski - Jagiellonian University
M. Panter - Max Planck Institute for Nuclear Physics
M. Paz Arribas - Humboldt-Universität zu Berlin
G. Pedaletti - Heidelberg University
G. Pelletier - Centre National de la Recherche Scientifique
P. -O. Petrucci - Université Joseph Fourier
S. Pita - Université Paris Cité
G. Pühlhofer - University of Tübingen
M. Punch - Laboratoire AstroParticule et Cosmologie
A. Quirrenbach - Heidelberg University
M. Raue - Max Planck Institute for Nuclear Physics
S. M. Rayner - Durham University
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
M. Renaud - Laboratoire de Physique Théorique
R. de Los Reyes
F. Rieger - Max Planck Institute for Nuclear Physics
J. Ripken - Stockholm University
L. Rob - Charles University
S. Rosier-Lees - Laboratoire d’Annecy de Physique des Particules
G. Rowell - University of Adelaide
B. Rudak - Nicolaus Copernicus Astronomical Center
C. B. Rulten - Durham University
J. Ruppel - Ruhr University Bochum
F. Ryde - KTH Royal Institute of Technology
V. Sahakian - A. Alikhanyan National Laboratory
A. Santangelo - University of Tübingen
R. Schlickeiser - Ruhr University Bochum
F. M. Schöck - Friedrich-Alexander-Universität Erlangen-Nürnberg
A. Schönwald - Humboldt-Universität zu Berlin
U. Schwanke - Humboldt-Universität zu Berlin
S. Schwarzburg - University of Tübingen
S. Schwemmer - Heidelberg University
A. Shalchi - Ruhr University Bochum
I. Sushch - Humboldt-Universität zu Berlin
M. Sikora - Nicolaus Copernicus Astronomical Center
J. L. Skilton - University of Leeds
H. Sol - Université Paris Cité
G. Spengler - Humboldt-Universität zu Berlin
Ł. Stawarz - Jagiellonian University
R. Steenkamp - University of Namibia
C. Stegmann - Friedrich-Alexander-Universität Erlangen-Nürnberg
F. Stinzing - Friedrich-Alexander-Universität Erlangen-Nürnberg
A. Szostek - Centre National de la Recherche Scientifique
P. H. Tam - Heidelberg University
J. -P. Tavernet - Laboratoire de Physique Nucléaire et de Hautes Énergies
R. Terrier - Centre National de la Recherche Scientifique
O. Tibolla - Max Planck Institute for Nuclear Physics
M. Tluczykont - Universität Hamburg
K. Valerius - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. van Eldik - Max Planck Institute for Nuclear Physics
G. Vasileiadis - Université de Montpellier
C. Venter - North-West University
J. P. Vialle - Institut National de Physique Nucléaire et de Physique des Particules
A. Viana - CEA Paris-Saclay
P. Vincent - Université Paris Cité
M. Vivier - Institut de Recherche sur les Lois Fondamentales de l'Univers
H. J. Völk - Max Planck Institute for Nuclear Physics
F. Volpe - Max Planck Institute for Nuclear Physics
S. Vorobiov - Institut National de Physique Nucléaire et de Physique des Particules
S. J. Wagner - Heidelberg University
M. Ward - Durham University
A. A. Zdziarski - Nicolaus Copernicus Astronomical Center
A. Zech - Universität Hamburg
H. -S. Zechlin - Universität Hamburg
Y. Fukui - Nagoya University
N. Furukawa - Nagoya University
A. Ohama - Nagoya University
H. Sano - Nagoya University
J. Dawson - Nagoya University
A. Kawamura - Nagoya University
Publication Details: Astronomy & Astrophysics - A&A, Vol.525
Identifiers: 9936472309311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00519435