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
和文:
英文:
会議名称
和文:
英文:
開催地
和文:
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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