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タイトル
和文: 
英文:A Dark Cloud Associated with an Unidentified EGRET Source 
著者
和文: Oka, T., 河合 誠之, Naito, T., Horiuchi, T., Namiki, M., Saito, Y., Romani, R. W., Kifune, T..  
英文: Oka, T., Kawai, N., Naito, T., Horiuchi, T., Namiki, M., Saito, Y., Romani, R. W., Kifune, T..  
言語 English 
掲載誌/書名
和文: 
英文:Astrophysical Journal 
巻, 号, ページ Vol. 526        pp. 764-771
出版年月 1999年12月 
出版者
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英文: 
会議名称
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開催地
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英文: 
アブストラクト CO J=1-0 mapping observations of the dark nebula Lynds 227, which is possibly associated with the unidentified EGRET source 2EG J1811-2339, are presented. We detected a large amount of molecular gas along Lynds 227 with a total mass of (1-2)x104 Msolar surrounding an X-ray synchrotron nebula, which was detected by the ASCA within the error circle of 2EG J1811-2339. Molecular gas along Lynds 227 shows spatial anticorrelation with the X-ray synchrotron nebula, suggesting that the synchrotron nebula is interacting with the Lynds 227 cloud. We propose a γ-ray emission mechanism for 2EG J1811-2339: high-energy electrons are injected from a rotation-powered pulsar and further accelerated in shock waves generated by the interaction with ambient matter. The high-energy electrons move into the molecular cloud at the Lynds 227 and collide with dense interstellar matter to yield high-energy γ-ray photons, mainly through relativistic bremsstrahlung.

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