Related papers: HESS J1023-575: Non-thermal particle acceleration …

Detection of extended very-high-energy gamma-ray emission towards the young stellar cluster Westerlund 2

Results from gamma-ray observations by the H.E.S.S. telescope array in the direction of the young stellar cluster Westerlund 2 are presented. Stereoscopic imaging of Cherenkov light emission of gamma-ray induced showers in the atmosphere is…

Astrophysics · Physics 2008-11-26 HESS Collaboration , F. Aharonian

VHE gamma-rays from Westerlund 2 and implications for the inferred energetics

The H.E.S.S. collaboration recently reported the discovery of VHE gamma-ray emission coincident with the young stellar cluster Westerlund 2. This system is known to host a population of hot, massive stars, and, most particularly, the WR…

Astrophysics · Physics 2007-10-19 O. Reimer , F. Aharonian , J. Hinton , W. Hofmann , S. Hoppe , M. Raue , A. Reimer

Fermi-LAT detection of gamma-ray emission in the vicinity of the star forming regions W43 and Westerlund 2

Particle acceleration in massive star forming regions can proceed via a large variety of possible emission scenarios, including high-energy gamma-ray production in the colliding wind zone of the massive Wolf-Rayet binary (here WR 20a and WR…

High Energy Astrophysical Phenomena · Physics 2011-09-23 M. Lemoine-Goumard , E. Ferrara , M. -H. Grondin , P. Martin , M. Renaud

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

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…

High Energy Astrophysical Phenomena · Physics 2015-05-20 The HESS Collaboration , A. Abramowski , F. 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 , J. Masbou , D. Maurin , T. J. L. McComb , M. C. Medina , J. Méhault , R. Moderski , E. 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. Pedaletti1 , G. Pelletier , P. -O. Petrucci , S. Pita1 , G. Pühlhofer , M. Punch , A. Quirrenbach , M. Raue , S. M. Rayner , A. Reimer , O. Reimer , M. Renaud , R. de los Reyes , F. Rieger1 , 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

Diffuse gamma-ray emission in the vicinity of young star cluster Westerlund 2

We report the results of our analysis of the publicly available data obtained by the Large Area Telescope (LAT) on board of the Fermi satellite towards the direction of the young massive star cluster Westerlund 2. We found significant…

High Energy Astrophysical Phenomena · Physics 2018-04-04 Rui-zhi Yang , Emma de Oña Wilhelmi , Felix Aharonian

The young massive stellar cluster Westerlund 1 in $\gamma$ rays as seen with H.E.S.S

Massive stellar clusters have recently been hypothesised as candidates for the acceleration of hadronic cosmic rays up to PeV energies. Previously, the H.E.S.S. Collaboration has reported about very extended $\gamma$-ray emission around…

High Energy Astrophysical Phenomena · Physics 2021-08-23 Lars Mohrmann , Andreas Specovius , Romed Rauth , Stefan Ohm , Christopher van Eldik

H.E.S.S. observations of massive stellar clusters

Stellar clusters are potential acceleration sites of very-high-energy (VHE, E > 100GeV) particles since they host supernova remnants (SNRs) and pulsar wind nebulae (PWNe). Additionally, in stellar clusters, particles can also be accelerated…

High Energy Astrophysical Phenomena · Physics 2009-07-13 Stefan Ohm , Dieter Horns , Olaf Reimer , Jim Hinton , Gavin Rowell , Emma de Oña Wilhelmi , Milton Virgilio Fernandes , Fabio Acero , Alexandre Marcowith

A deep spectromorphological study of the $\gamma$-ray emission surrounding the young massive stellar cluster Westerlund 1

Young massive stellar clusters are extreme environments and potentially provide the means for efficient particle acceleration. Indeed, they are increasingly considered as being responsible for a significant fraction of cosmic rays (CRs)…

High Energy Astrophysical Phenomena · Physics 2022-11-11 F. Aharonian , H. Ashkar , M. Backes , V. Barbosa Martins , Y. Becherini , D. Berge , B. Bi , M. Böttcher , M. de Bony de Lavergne , F. Bradascio , R. Brose , F. Brun , T. Bulik , C. Burger-Scheidlin , F. Cangemi , S. Caroff , S. Casanova , M. Cerruti , T. Chand , S. Chandra , A. Chen , O. Chibueze , P. Cristofari , J. Damascene Mbarubucyeye , A. Djannati-Ataï , J. -P. Ernenwein , K. Feijen , G. Fichet de Clairfontaine , G. Fontaine , S. Funk , S. Gabici , Y. A. Gallant , S. Ghafourizadeh , G. Giavitto , L. Giunti , D. Glawion , J. F. Glicenstein , P. Goswami , M. -H. Grondin , L. K. Härer , M. Haupt , J. A. Hinton , M. Hörbe , W. Hofmann , T. L. Holch , M. Holler , D. Horns , M. Jamrozy , V. Joshi , I. Jung-Richardt , E. Kasai , K. Katarzyński , U. Katz , B. Khélifi , W. Kluźniak , Nu. Komin , K. Kosack , D. Kostunin , G. Kukec Mezek , R. G. Lang , S. Le Stum , A. Lemière , M. Lemoine-Goumard , J. -P. Lenain , F. Leuschner , T. Lohse , A. Luashvili , I. Lypova , J. Mackey , J. Majumdar , D. Malyshev , V. Marandon , P. Marchegiani , A. Marcowith , G. Martí-Devesa , R. Marx , G. Maurin , M. Meyer , A. Mitchell , R. Moderski , L. Mohrmann , A. Montanari , E. Moulin , J. Muller , T. Murach , K. Nakashima , M. de Naurois , A. Nayerhoda , J. Niemiec , S. Ohm , L. Olivera-Nieto , E. de Ona Wilhelmi , M. Ostrowski , S. Panny , M. Panter , R. D. Parsons , G. Peron , D. A. Prokhorov , G. Pühlhofer , M. Punch , A. Quirrenbach , R. Rauth , P. Reichherzer , A. Reimer , O. Reimer , M. Renaud , B. Reville , F. Rieger , G. Rowell , B. Rudak , E. Ruiz-Velasco , V. Sahakian , H. Salzmann , D. A. Sanchez , A. Santangelo , M. Sasaki , F. Schüssler , H. M. Schutte , U. Schwanke , J. N. S. Shapopi , A. Specovius , S. Spencer , Ł. Stawarz , R. Steenkamp , S. Steinmassl , C. Steppa , I. Sushch , H. Suzuki , T. Takahashi , T. Tanaka , R. Terrier , C. Thorpe-Morgan , M. Tsirou , N. Tsuji , R. Tuffs , T. Unbehaun , C. van Eldik , B. van Soelen , M. Vecchi , J. Veh , C. Venter , J. Vink , S. J. Wagner , R. White , A. Wierzcholska , Yu Wun Wong , M. Zacharias , D. Zargaryan , A. A. Zdziarski , S. J. Zhu , S. Zouari , N. Żywucka , R. Blackwell , C. Braiding , M. Burton , K. Cubuk , M. Filipović , N. Tothill , G. Wong

Gamma-ray production in young open clusters: Berk 87, Cyg OB2 and Westerlund 2

Young open clusters are likely sites of cosmic ray acceleration as indicated by recent detections of the TeV gamma-ray sources in the directions of two open clusters (Cyg OB2 and Westerlund 2) and their directional proximity to some…

Astrophysics · Physics 2013-06-21 W. Bednarek

The Environment around the Young Massive Star Cluster RSGC 1 and HESS J1837-069

We report on Mopra observations toward the young massive star cluster RSGC 1, adjoined by, and possibly associated with the gamma-ray source HESS J1837-069. We measure the CO (J=1-0) distribution around the cluster and gamma-ray source, and…

Astrophysics of Galaxies · Physics 2015-06-17 Yutaka Fujita , Hiroyuki Nakanishi , Erik Muller , Naoto Kobayashi , Masao Saito , Chikako Yasui , Hiroki Kikuchi , Keigo Yoshinaga

Suzaku Observation of the Diffuse X-Ray Emission from the Open Cluster Westerlund 2: a Hypernova Remnant?

We present the analysis of Suzaku observations of the young open cluster Westerlund 2, which is filled with diffuse X-ray emission. We found that the emission consists of three thermal components or two thermal and one non-thermal…

High Energy Astrophysical Phenomena · Physics 2015-05-13 Yutaka Fujita , Kiyoshi Hayashida , Hiroaki Takahashi , Fumio Takahara

Discovery of extended VHE \gamma-ray emission from the vicinity of the young massive stellar cluster Westerlund 1

Results obtained in very-high-energy (VHE; E > 100 GeV) \gamma-ray observations performed with the H.E.S.S. telescope array are used to investigate particle acceleration processes in the vicinity of the young massive stellar cluster…

High Energy Astrophysical Phenomena · Physics 2012-01-19 HESS Collaboration , A. Abramowski , F. Acero , F. Aharonian , A. G. Akhperjanian , G. Anton , A. Balzer , A. Barnacka , U. Barres de Almeida , Y. Becherini , J. Becker , B. Behera , K. Bernlöhr , E. Birsin , J. Biteau , A. Bochow , C. Boisson , J. Bolmont , P. Bordas , J. Brucker , F. Brun , P. Brun , T. Bulik , I. Büsching , S. Carrigan , S. Casanova , M. Cerruti , P. M. Chadwick , A. Charbonnier , R. C. G. Chaves , A. Cheesebrough , L. -M. Chounet , A. C. Clapson , G. Coignet , G. Cologna , J. Conrad , 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 , K. Dutson , J. Dyks , M. Dyrda , K. Egberts , P. Eger , P. Espigat , L. Fallon , C. Farnier , S. Fegan , F. Feinstein , M. V. Fernandes , A. Fiasson , G. Fontaine , A. Förster , M. Füßling , Y. A. Gallant , H. Gast , L. Gérard , D. Gerbig , B. Giebels , J. F. Glicenstein , B. Glück , P. Goret , D. Göring , S. Häffner , 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. Holler , D. Horns , A. Jacholkowska , O. C. de Jager , C. Jahn , M. Jamrozy , I. Jung , M. A. Kastendieck , K. Katarzynski , U. Katz , S. Kaufmann , D. Keogh , D. Khangulyan , B. Khélifi , D. Klochkov , W. Kluźniak , T. Kneiske , Nu. Komin , K. Kosack , R. Kossakowski , H. Laffon , G. Lamanna , D. Lennarz , T. Lohse , A. Lopatin , C. -C. Lu , V. Marandon , A. Marcowith , J. Masbou , D. Maurin , N. Maxted , M. Mayer , T. J. L. McComb , M. C. Medina , J. Méhault , R. Moderski , E. Moulin , C. L. Naumann , M. Naumann-Godo , M. de Naurois , D. Nedbal , D. Nekrassov , N. Nguyen , B. Nicholas , J. Niemiec , S. J. Nolan , S. Ohm , E. de Ona Wilhelmi , B. Opitz , M. Ostrowski , I. Oya , 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 , V. Sahakian , D. Sanchez , A. Santangelo , R. Schlickeiser , F. M. Schöck , A. Schulz , U. Schwanke , S. Schwarzburg , S. Schwemmer , F. Sheidaei , M. Sikora , J. L. Skilton , H. Sol , G. Spengler , L. Stawarz , R. Steenkamp , C. Stegmann , F. Stinzing , K. Stycz , I. Sushch , A. Szostek , J. -P. Tavernet , R. Terrier , M. Tluczykont , K. Valerius , C. van Eldik , G. Vasileiadis , C. Venter , J. P. Vialle , A. Viana , P. Vincent , H. J. Völk , F. Volpe , S. Vorobiov , M. Vorster , S. J. Wagner , M. Ward , R. White , A. Wierzcholska , M. Zacharias , A. Zajczyk , A. A. Zdziarski , A. Zech , H. -S. Zechlin

On the Distance and Molecular Environment of Westerlund 2 and HESS J1023-575

The extended TeV gamma-ray source HESS J1023-575 is coincident with the massive, young stellar cluster Westerlund 2 (Wd2) and its surrounding HII region RCW 49. On the basis of an analysis of the CO emission and 21 cm absorption along the…

Astrophysics · Physics 2009-11-13 T. M. Dame

On the hadronic origin of the very high energy $\gamma$-ray emission surrounding the young massive stellar cluster Westerlund 1

The Westerlund 1 (Wd 1) is the most massive known young star cluster in the Galaxy, and an extended $\gamma$-ray source HESS J1646-458 surrounding it has been detected up to 80 TeV in the very high energy, implying that cosmic rays (CRs)…

High Energy Astrophysical Phenomena · Physics 2026-01-27 Zhaodong Shi , Rui-zhi Yang

X-ray emission from Westerlund 2 detected by SRG/ART-XC and Chandra: search for radiation of TeV leptons

We present the results of current observations of the young compact cluster of massive stars Westerlund 2 with the Mikhail Pavlinsky ART-XC telescope aboard the Spectrum-Roentgen-Gamma (SRG) observatory which we analysed together with the…

High Energy Astrophysical Phenomena · Physics 2023-09-11 A. M. Bykov , Yu. A. Uvarov , M. E. Kalyashova , D. V. Badmaev , I. Yu. Lapshov , A. A. Lutovinov , I. A. Mereminskiy , A. N. Semena

Probing the hadronic nature of the gamma-ray emission associated with Westerlund 2

Star-forming regions have been proposed as potential Galactic cosmic-ray accelerators for decades. Cosmic-ray acceleration can be probed through observations of gamma-rays produced in inelastic proton-proton collisions, at GeV and TeV…

High Energy Astrophysical Phenomena · Physics 2021-05-26 Enrique Mestre , Emma de Ona Wilhelmi , Diego F. Torres , Tim Lukas Holch , Ullrich Schwanke , Felix Aharonian , Pablo Saz Parkinson , Ruizhi Yang , Roberta Zanin

Discovery of Molecular and Atomic Gas associated with HESS J1646-458 (Westerlund 1): Spatial TeV Gamma-Ray and Interstellar Proton Correspondence

We report CO and HI studies of molecular and atomic gas toward the TeV gamma-ray source HESS J1646$-$458, widely considered to be associated with the young massive cluster Westerlund 1 (Wd1). We found that molecular clouds at…

High Energy Astrophysical Phenomena · Physics 2026-05-26 H. Sano , Y. Fukui , S. Fujimori , T. Murase , R. Z. E. Alsaberi , M. D. Filipović , G. Rowell , M. Aruga , Y. Asano , R. G. Bhuvana , F. Demachi , S. Einecke , N. Fukaya , R. Hamada , H. Inoue , T. Kamazaki , S. Lazarević , T. Minamidani , Z. J. Smeaton , H. Sudou , K. Tachihara , H. Takaba , K. Tsuge , R. I. Yamada

Probing the hadronic nature of the gamma-ray emission associated with Westerlund 2

Star-forming regions have been proposed as potential Galactic cosmic-ray accelerators for decades. Cosmic ray acceleration can be probed through observations of gamma-rays produced in inelastic proton-proton collisions, at GeV and TeV…

High Energy Astrophysical Phenomena · Physics 2021-09-17 Emma de Ona Wilhelmi , Enrique Mestre , Diego F. Torres , Tim Lukas Holch , Ullrich Schwanke , Felix Aharonian , Pablo Saz Parkinson , Ruizhi Yang , Roberta Zanin

Explaining the extended GeV gamma-ray emission adjacent to HESS J1825-137

HESS J1825-137 is one of the most powerful and luminous TeV gamma-ray pulsar wind nebulae (PWN). To the south of HESS J1825-137, Fermi-LAT observation revealed a new region of GeV gamma-ray emission with three apparent peaks (termed here,…

High Energy Astrophysical Phenomena · Physics 2021-04-15 T. Collins , G. Rowell , A. M. W. Mitchell , F. Voisin , Y. Fukui , H. Sano , R. Alsulami , S. Einecke

Diffuse gamma-ray emission from the vicinity of young massive star cluster RSGC 1

We report the Fermi Large Area Telescope (Fermi-LAT) detection of the gamma-ray emission towards the young massive star cluster RSGC 1. Using the latest source catalog and diffuse background models, we found that the diffuse gamma-ray…

High Energy Astrophysical Phenomena · Physics 2020-06-04 Xiao-Na Sun , Rui-Zhi Yang , Xiang-Yu Wang