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Type: Journal article
Title: A peculiar jet and arc of molecular gas toward the rich and young stellar cluster westerlund 2 and a TeV gamma ray source
Author: Fukui, Y.
Furukawa, N.
Dame, T.
Dawson, J.
Yamamoto, H.
Rowell, G.
Aharonian, F.
Hofmann, W.
de Ona Wilhelmi, E.
Minamidani, T.
Kawamura, A.
Mizuno, N.
Onishi, T.
Mizuno, A.
Nagataki, S.
Citation: Publications of the Astronomical Society of Japan, 2009; 61(4):L23-L27
Publisher: Astronomical Soc Japan
Issue Date: 2009
ISSN: 0004-6264
Statement of
Fukui, Yasuo; Furukawa, Naoko; Dame, Thomas M.; Dawson, Joanne R.; Yamamoto, Hiroaki; Rowell, Gavin P.; Aharonian, Felix; Hofmann, Werner; de Oña Wilhelmi, Emma; Minamidani, Tetsuhiro; Kawamura, Akiko; Mizuno, Norikazu; Onishi, Toshikazu; Mizuno, Akira; Nagataki, Shigehiro
Abstract: We have discovered remarkable jet- and arc-like molecular features toward the rich and young stellar cluster Westerlund2. The jet has a length of ~100 pc and a width of ~10 pc, while the arc shows a crescent shape with a radius of ~30 pc. These molecular features each have masses of ~10000 solar mass and show spatial correlations with the surrounding lower density HI gas. The jet also shows an intriguing positional alignment with the core of the TeV gamma ray source HESS J1023-575 and with the MeV/GeV gamma-ray source recently reported by the Fermi collaboration. We argue that the jet and arc are caused by an energetic event in Westerlund 2, presumably due to an anisotropic supernova explosion of one of the most massive member stars. While the origin of the TeV and GeV gamma-ray sources is uncertain, one may speculate that they are related to the same event via relativistic particle acceleration by strong shock waves produced at the explosion or by remnant objects such as a pulsar wind nebula or microquasar
Keywords: High Energy Astrophysical Phenomena (astro-ph.HE)
Rights: (c) 2009 Astronomical Society of Japan. Submitted to Cornell University’s online archive in 2009 by Naoko Furukawa.Post-print sourced from
RMID: 0020093023
DOI: 10.1093/pasj/61.4.L23
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Appears in Collections:Chemistry and Physics publications

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