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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Serpens-Aquila Rift ： ウィキペディア英語版 Serpens-Aquila Rift The Serpens-Aquila Rift (also known as the Aquila Rift) is a region of the sky in the constellations Aquila, Serpens Cauda, and eastern Ophiuchus containing dark interstellar clouds. The region forms part of the Great Rift, a dark band that passes through the middle of the plane of the Milky Way Galaxy. The clouds that form this structure are called "molecular clouds", constituting a phase of the interstellar medium which is cold and dense enough for molecules to form, particularly molecular hydrogen (H2). These clouds are opaque to light in the optical part of the spectrum due to the presence of interstellar dust grains mixed with the gaseous component of the clouds. Therefore, the clouds in the Serpens-Aquila Rift block light from background stars in the disk of the Galaxy, forming the dark rift. The complex is located in a direction towards the inner Galaxy, where molecular clouds are common, so it is possible that not all components of the rift are at the same distance and physically associated with each other.〔 Several star-forming regions are projected in (or near) the direction of the Serpens-Aquila Rift, including Westerhout 40,〔〔 Serpens Main,〔 Serpens south,〔 Serpens NH3,〔〔 and MWC297/Sh2-62.〔〔 ==Distance== Distances to molecular clouds and star-forming regions in the Milky Way Galaxy have been difficult to constrain.〔 By counting the number of stars in front of the Serpens-Aquila Rift and using statistical models of the distribution of stars in the Galaxy, astronomers estimated that stars begin to be obscured by the clouds at a distance of 225±55 pc.〔〔 For radio sources the Serpens Main star cluster, parallax measurements from the Very Long Baseline Array give a distance of 415±15 pc.〔 The distance for Westerhout 40 has been estimated to be 500 pc using models for stellar luminosities.〔〔〔 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「Serpens-Aquila Rift」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.