An Updated View of the VHE Gamma-Ray Sky Around the Stellar Cluster Westerlund 2 with the H.E.S.S. Experiment
T. L. Holch,F. Aharonian,Faical Ait-Benkhali,Attila Alkan,Jann Aschersleben,Halim Ashkar,Michael Backes,Ali Baktash,V. Barbosa Martins,A. Barnacka,Joleen Barnard,Rowan William Batzofin,Y. Becherini,Geoffrey Beck,D. Berge,K. Bernloehr,Baiyang Bi,Markus Boettcher,C. Boisson,J. Bolmont,Mathieu Bony,Jowita Borowska,Makarim Bouyahiaoui,F. Bradascio,M. Breuhaus,Robert Brose,A. M. Brown,F. Brun,Benedetta Bruno,T. Bulik,Christopher Burger-Scheidlin,Thomas Bylund,F. Cangemi,S. Caroff,S. Casanova,Rahul Cecil,Jelena Celic,M. Cerruti,Pauline Chambéry,T. Chand,S. Chandra,Andrew Chen,James O. Chibueze,Ogochukwu Chibueze,Tiffany Collins,G. Cotter,Pierre Cristofari,J. Damascene Mbarubucyeye,I. D. Davids,J. Davies,Laenita de Jonge,J. Devin,A. Djannati‐Ataï,A. Dmytriiev,Victor Doroshenko,Lenté Dreyer,Louis Du Plessis,K. Egberts,S. Einecke,J.‐P. Ernenwein,S. J. Fegan,K. Feijen,G. Fichet de Clairfontaine,G. Fontaine,Lott Frans,Matthias Fuessling,Stefan Funk,S. Gabici,Y. A. Gallant,S. Ghafourizadeh,G. Giavitto,Luca Giunti,D. Glawion,J. F. Glicenstein,Jonas Glombitza,Pranjupriya Goswami,Guillaume Grolleron,M.-H. Grondin,L. Haerer,Sumari Hattingh,M. Haupt,G. Hermann,J. A. Hinton,W. Hofmann,M. Holler,D. Horns,Zhiqiu Huang,Annanay Jaitly,M. Jamrozy,F. Jankowsky,A. Jardin-Blicq,Vikas Joshi,I. Jung-Richardt,E. Kasai,K. Katarzyński,Hiiko Katjaita,D. Khangulyan,Rukaiya Khatoon,B. Khélifi,S. Klepser,W. Kluźniak,Nu. Komin,Ruslan Konno,K. Kosack,D. Kostunin,A. Kundu,G. Lamanna,Rodrigo Guedes Lang,S. Le Stum,V. Lefranc,Franziska Leitl,A. Lemière,M. Lemoine‐Goumard,Jean-Philippe Lenain,Fabian Leuschner,A. Luashvili,I. Lypova,Jonathan Mackey,D. Malyshev,Dmitry Malyshev,V. Marandon,A. Marcowith,Peter David Marinos,Guillem Marti'i-Devesa,R. Marx,G. Maurin,Abhay Mehta,Pieter Meintjes,M. Meyer,Alison Mitchell,R. Moderski,L. Mohrmann,A. Montanari,C. J. Moore,Emmanuel Moulin,T. Murach,Kaori Nakashima,M. de Naurois,H. Ndiyavala,J. Niemiec,A. Priyana Noel,P. T. O’Brien,S. Ohm,Laura Olivera-Nieto,E. Oña-Wilhelmi,M. Ostrowski,Enzo Oukacha,Sebastian Panny,M. Panter,D. R. Parsons,Ugo Pensec,Giada Peron,S. Pita,V. Poireau,Dmitry Prokhorov,H. Prokoph,G. Puehlhofer,M. Punch,A. Quirrenbach,Maxime Regeard,Patrick Reichherzer,O. Reimer,Igor Guedes Nogueira Reis,Quentin Rémy,Helena X. Ren,M. Renaud,Brian Reville,F. Rieger,Gerrit Roellinghoff,E. Rol,G. Rowell,B. Rudak,Hector Rueda Ricarte,Edna Ruiz Velasco,Karim Sabri,V. Sahakian,Simon Sailer,Heiko Salzmann,David Sánchez,A. Santangelo,M. Sasaki,Johannes Schaefer,F. Schuessler,H. M. Schutte,M. Senniappan,J. N. S. Shapopi,Sigrid Shilunga,K. Shiningayamwe,H. Sol,Hugh Spackman,A. Specovius,S. Spencer,Ł. Stawarz,R. Steenkamp,C. Stegmann,S. Steinmassl,C. Steppa,Katrin Streil,I. Sushch,Hiromasa Suzuki,Tadayuki Takahashi,Takaaki Tanaka,T. Tavernier,A. M. Taylor,R. Terrier,Adnaan Thakur,Hannes Thiersen,Charles Thorpe-Morgan,M. Tluczykont,M. Tsirou,N. Tsuji,R. Tuffs,Y. Uchiyama,Marion Ullmo,Tim Unbehaun,Pieter van der Merwe,C. van Eldik,B. van Soelen,G. Vasileiadis,M. Vecchi,J. Veh,C. Venter,J. Vink,H. J. Voêlk,Naomi Vogel,Tina Wach,S. J. Wagner,F. Werner,R. White,A. Wierzcholska,Yu Wun Wong,Hend Mahmoud Yassin,M. Zacharias,D. Zargaryan,Andrzej Zdziarski,A. Zech,Sylvia Zhu,Andreas Zmija,S. Zouari,N. Żywucka
openalex（2023）
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摘要
Since the last H.E.S.S. publication on the stellar cluster Westerlund 2 in 2011, the H.E.S.S. dataset on this region has increased more than three-fold in exposure to $\sim220\,$h of total observation time. By applying a novel approach to correct for atmospheric variations in IACT data, the commonly applied data quality selection criteria can be adapted to exploit as much of this dataset as possible. In combination with current analysis techniques, it is furthermore possible to disentangle and better characterise this complex region of the gamma-ray sky. Applying an extensive 3D fitting procedure, we find three distinct VHE gamma-ray sources in the vicinity of Westerlund 2, adding a new emission region to the previously reported sources HESS J1023$-$575 and HESS~J1026$-$582. Even though the sources partly overlap, their spectral indices differ from one another, providing new clues on the relativistic particle acceleration and propagation in the region around the massive star cluster. The new source component shows an elongated morphology that seems to emerge from the star cluster, following the multi-parsec-scale CO jet cloud initially found in NANTEN data as reported in 2009.
