... A group of galaxies in the vicinity of the Milky Way, with a diameter of about 5 million light years. Also called the Local Group. There are about 20 confirmed members, and in order of brightness they are the Andromeda Galaxy M31 (SAb type, visual absolute magnitude -21.1), the Milky Way (Sb or Sbc type, estimated to be -20), the Triangulum spiral galaxy M33 (SAcd type, -18.9), the Large Magellanic Cloud (irregular type, -18.5), and the Small Magellanic Cloud (irregular type, -16.8). *Some of the terminology that refers to the "Local Nebula Group" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 銀河系周辺において,直径約500万光年の範囲の銀河が作っているグループ。局部星雲群とも呼ぶ。確実なメンバーは約20個で,明るい順にアンドロメダ銀河M31(SAb型,実視絶対等級-21.1等),銀河系(SbまたはSbc型,-20等と推定),さんかく座の渦巻銀河M33(SAcd型,-18.9等),大マゼラン銀河(不規則型,-18.5等),小マゼラン銀河(不規則型,-16.8等)とつづく。… ※「局部星雲群」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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