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--> |dist_ly = |dist_pc = |dist_z = |appmag_v = |appdia = |size_v = |constellation = |radius_ly = |radius_pc = |dimensions = |absmag_v = |notes = |names = }} Galactic Worm 123.4-1.5 (GW 123.4-1.5) is an H I region with a mass of approximately 105 MSun.〔http://arxiv.org/pdf/astro-ph/0003081〕 It has an unusual mushroom-shaped structure that may be the result of having been formed by an infalling cloud slamming through the disc of the Milky Way from the other side. The high velocity cloud in question is theorized as having hit at around 100 km/s, 5 years ago.〔(arXiv:0801.3186 How was the mushroom-shaped GW 123.4-1.5 formed in the Galactic disk? )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GW 123.4-1.5」の詳細全文を読む スポンサード リンク
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