Galactic rotation constant - ginga kaiten teisou

Japanese: 銀河回転定数 - ぎんがかいてんていすう
Galactic rotation constant - ginga kaiten teisou

…A constant introduced by Dutch astronomer J. H. Oort in 1927 to derive the rotation of the Milky Way from observations of the radial velocity and proper motion of stars near the Sun. The Milky Way, a large group of stars including the Sun, maintains equilibrium by rotating around its center of gravity. Stars and interstellar gas in the Galactic plane move in a nearly circular motion around the center of the galaxy, and when the radial velocity V r and proper motion μ l of stars near the Sun that move in this way are observed, they change as follows depending on the star's distance from the Sun r and its galactic longitude l : …

*Some of the terminology that mentions the "Galactic rotation constant" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…太陽近傍の恒星の視線速度および固有運動の観測から,銀河系の回転を導くために,1927年オランダの天文学者J.H.オールトによって導入された定数。太陽を含む大恒星集団としての銀河系は,その重心のまわりに回転することによって平衡を保つ。銀河面内の星や星間ガスは,銀河中心のまわりにほぼ円運動を行っており,そのような運動を行う太陽近傍星の視線速度Vr,固有運動μlを観測すると,それらは星々の太陽からの距離rと銀経lに依存して次のように変化する。…

※「銀河回転定数」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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