A grouping of galaxies slightly larger than a galaxy cluster. Its existence, which had been proposed since the early 1950s, was revealed in the late 1970s to be a common structure found throughout the universe, and it was named a supercluster. A familiar example is the Local Supercluster, in which many galaxy groups and galaxy clusters are gathered in a flattened disk shape with a major axis of about 100 million light years. The Local Group, which includes our Milky Way, is located on the periphery of this supercluster, and the Virgo Cluster is at its core. Since then, many superclusters have been discovered, while the existence of hollow regions (voids) with almost no galaxies has also become known, leading to the proposal of a bubble model of the universe (galaxies are distributed on the surface of the bubble, the areas where the bubbles stick together correspond to superclusters, and the internal cavities correspond to voids). [Takase Bunshiro] "The Science of the Galaxy" by Oobi Nobuya (1989, NHK Publishing)" ▽ "The Evolution of the Universe as Told by Galaxies" by Ie Masanori (1992, Baifukan)" ▽ "From Stars to Galaxies: Herschel's Garden" by Heinz R. Pagel, translated by Kuroboshi Eiichi (1993, Chijin Shokan)" ▽ "The Milky Way and the Galactic Universe" by Okamura Sadanori (1999, University of Tokyo Press)" ▽ "Invitation to Astronomy" edited by Okamura Sadanori (2001, Asakura Shoten) [References] | | | |A galaxy cluster is made up of around 1,000 to 2,000 galaxies. The photo shows just a part of it. Photographed by the Ultraviolet Space Telescope © NASA / JPL-Caltech / SSC "> Virgo Cluster Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
銀河団より一回り大規模な銀河の集団体系。1950年代初期から提唱されていたその存在は、1970年代末には宇宙全域にみられる一般的構造であることが明らかにされ、超銀河団と名づけられた。身近な例は局部超銀河団で、長径約1億光年の扁平(へんぺい)な円盤形に多くの銀河群や銀河団が集まっている。わが銀河系を含む局部銀河群はこの超銀河団の周辺部に位置しており、その中核部には、おとめ座銀河団が存在する。その後も多数の超銀河団がみいだされる一方、銀河がほとんどない空洞領域(ボイド)の存在も知られるようになり、宇宙の泡モデル(銀河は泡の表面に分布し、泡同士のくっつきあったところが超銀河団、内部の空洞がボイドに相当する)が提唱されている。 [高瀬文志郎] 『小尾信彌著『銀河の科学』(1989・日本放送出版協会)』▽『家正則著『銀河が語る宇宙の進化』(1992・培風館)』▽『ハインツ・R・パージェル著、黒星瑩一訳『星から銀河へ――ハーシェルの庭』(1993・地人書館)』▽『岡村定矩著『銀河系と銀河宇宙』(1999・東京大学出版会)』▽『岡村定矩編『天文学への招待』(2001・朝倉書店)』 [参照項目] | | | |1000~2000個ほどの銀河で構成されている銀河団。写真はその一部。紫外線宇宙望遠鏡により撮影©NASA/JPL-Caltech/SSC"> おとめ座銀河団 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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