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titleSuzaku Observation of the Diffuse X-Ray Emission from the Open Cluster Westerlund 2: a Hypernova Remnant?
Author(jpn)藤田, 裕; 林田, 清; 高橋, 宏明; 高原, 文郎
Author(eng)Fujita, Yutaka,; Hayashida, Kiyoshi; Takahashi, Hiroaki; Takahara, Fumio
Author Affiliation(jpn)大阪大学大学院理学研究科宇宙地球科学専攻; 大阪大学大学院理学研究科宇宙地球科学専攻; 大阪大学大学院理学研究科宇宙地球科学専攻; 大阪大学大学院理学研究科宇宙地球科学専攻
Author Affiliation(eng)Department of Earth and Space Science, Graduate School of Science, Osaka University; Department of Earth and Space Science, Graduate School of Science, Osaka University; Department of Earth and Space Science, Graduate School of Science, Osaka University; Department of Earth and Space Science, Graduate School of Science, Osaka University
Issue Date2010-02-26
Publisher宇宙航空研究開発機構
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料:
JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H
VolumeJAXA-SP-09-008E
Start page44
End page45
Publication date2010-02-26
Languageeng
AbstractWe 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 components. The upper limit of the energy flux of the non-thermal component is smaller than that in the TeV band observed with H.E.S.S. This may indicate that active particle acceleration has stopped in this cluster, and that the accelerated electrons have already cooled. The gamma-ray emission observed with H.E.S.S. is likely to come from high-energy protons, which hardly cool in contrast with electrons. Metal abundances of the diffuse X-ray gas may indicate the explosion of a massive star in the past. The details of this study are presented in Fujita et al. (2009a).
DescriptionMeeting Information: The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
Keywordsstars: winds, outflows - ISM: cosmic rays - ISM: individual (RCW 49) - ISM: supernova remnants - Galaxy: open clusters and associations: individual (Westerlund 2)
Document TypeConference Paper
JAXA Category特別資料
ISSN1349-113X
NCIDAA11984031
SHI-NOAA0064574016
Report NoJAXA-SP-09-008E
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/17209


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