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

H.E.S.S. Collaboration

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

H.E.S.S. Collaboration

Institute of Astro and Particle Physics
University of Innsbruck
Department of Physics
University of Namibia
Dublin Institute for Advanced Studies
Max-Planck-Institut für Kernphysik
Russian-Armenian University
Aix-Marseille Université
Centre for Space Research
North-West University
Laboratoire d'Annecy de Physique des Particules
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
Department of Physics
University of Oxford
Université Paris-Saclay
Institute for Nuclear Physics
c/o DESY
Jagiellonian University
School of Physics
University of the Witwatersrand, Johannesburg
Department of Physics and Electrical Engineering
Linnaeus University, Växjö
University of Tübingen
LUTH - Laboratoire de l'Univers et de ses Theories
Sorbonne Université
University of Warsaw
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
UMR 5797
Astroparticule and Cosmol APC
Department of Physics and Astronomy
University of Leicester

Research output: Contribution to journal › Conference article › peer-review

Abstract

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 γ-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Way. In this contribution we present an updated analysis that employs a new analysis technique and is based on a much larger data set, allowing us to constrain better the morphology and the energy spectrum of the emission. The analysis technique used is a three-dimensional likelihood analysis, which is especially well suited for largely extended sources. The origin of the γ-ray emission will be discussed in light of multi-wavelength observations.

Original language	English
Article number	789
Journal	Proceedings of Science
Volume	395
Publication status	Published - 18 Mar 2022
Event	37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany Duration: 12 Jul 2021 → 23 Jul 2021

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@article{bafe125316834660b0ff74d9251145bc,

title = "The young massive stellar cluster Westerlund 1 in γ rays as seen with H.E.S.S.",

abstract = "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 γ-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Way. In this contribution we present an updated analysis that employs a new analysis technique and is based on a much larger data set, allowing us to constrain better the morphology and the energy spectrum of the emission. The analysis technique used is a three-dimensional likelihood analysis, which is especially well suited for largely extended sources. The origin of the γ-ray emission will be discussed in light of multi-wavelength observations.",

author = "\{H.E.S.S. Collaboration\} and Romed Rauth and H. Abdalla and F. Aharonian and \{Ait Benkhali\}, F. and Ang{\"u}ner, \{E. O.\} and C. Arcaro and C. Armand and T. Armstrong and H. Ashkar and M. Backes and V. Baghmanyan and \{Barbosa Martins\}, V. and A. Barnacka and M. Barnard and R. Batzofin and Y. Becherini and D. Berge and K. Bernl{\"o}hr and B. Bi and M. B{\"o}ttcher and C. Boisson and J. Bolmont and \{de Bony de Lavergne\}, M. and M. Breuhaus and R. Brose and F. Brun and T. Bulik and T. Bylund and F. Cangemi and S. Caroff and S. Casanova and J. Catalano and P. Chambery and T. Chand and A. Chen and G. Cotter and M. Cury{\l}o and H. Dalgleish and \{Damascene Mbarubucyeye\}, J. and Davids, \{I. D.\} and J. Davies and J. Devin and A. Djannati-Ata{\"i} and A. Dmytriiev and A. Donath and V. Doroshenko and L. Dreyer and \{Du Plessis\}, L. and C. Duffy and S. Fegan",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).; 37th International Cosmic Ray Conference, ICRC 2021 ; Conference date: 12-07-2021 Through 23-07-2021",

year = "2022",

month = mar,

day = "18",

language = "English",

volume = "395",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - The young massive stellar cluster Westerlund 1 in γ rays as seen with H.E.S.S.

AU - H.E.S.S. Collaboration

AU - Rauth, Romed

AU - Abdalla, H.

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Angüner, E. O.

AU - Arcaro, C.

AU - Armand, C.

AU - Armstrong, T.

AU - Ashkar, H.

AU - Backes, M.

AU - Baghmanyan, V.

AU - Barbosa Martins, V.

AU - Barnacka, A.

AU - Barnard, M.

AU - Batzofin, R.

AU - Becherini, Y.

AU - Berge, D.

AU - Bernlöhr, K.

AU - Bi, B.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - de Bony de Lavergne, M.

AU - Breuhaus, M.

AU - Brose, R.

AU - Brun, F.

AU - Bulik, T.

AU - Bylund, T.

AU - Cangemi, F.

AU - Caroff, S.

AU - Casanova, S.

AU - Catalano, J.

AU - Chambery, P.

AU - Chand, T.

AU - Chen, A.

AU - Cotter, G.

AU - Curyło, M.

AU - Dalgleish, H.

AU - Damascene Mbarubucyeye, J.

AU - Davids, I. D.

AU - Davies, J.

AU - Devin, J.

AU - Djannati-Ataï, A.

AU - Dmytriiev, A.

AU - Donath, A.

AU - Doroshenko, V.

AU - Dreyer, L.

AU - Du Plessis, L.

AU - Duffy, C.

AU - Fegan, S.

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

PY - 2022/3/18

Y1 - 2022/3/18

N2 - 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 γ-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Way. In this contribution we present an updated analysis that employs a new analysis technique and is based on a much larger data set, allowing us to constrain better the morphology and the energy spectrum of the emission. The analysis technique used is a three-dimensional likelihood analysis, which is especially well suited for largely extended sources. The origin of the γ-ray emission will be discussed in light of multi-wavelength observations.

AB - 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 γ-ray emission around Westerlund 1, a massive young stellar cluster in the Milky Way. In this contribution we present an updated analysis that employs a new analysis technique and is based on a much larger data set, allowing us to constrain better the morphology and the energy spectrum of the emission. The analysis technique used is a three-dimensional likelihood analysis, which is especially well suited for largely extended sources. The origin of the γ-ray emission will be discussed in light of multi-wavelength observations.

M3 - Conference article

AN - SCOPUS:85145256075

SN - 1824-8039

VL - 395

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 789

T2 - 37th International Cosmic Ray Conference, ICRC 2021

Y2 - 12 July 2021 through 23 July 2021

ER -

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

Abstract

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