Ostriker–Peebles criterion (original) (raw)
In astronomy, the Ostriker–Peebles criterion, named after its discoverers Jeremiah Ostriker and Jim Peebles, describes the formation of barred galaxies. The rotating disc of a spiral galaxy, consisting of stars and solar systems, may become unstable in a way that the stars in the outer parts of the "arms" are released from the galaxy system, resulting in the collapse of the remaining stars into a bar-shaped galaxy. This occurs in approximately 1/3 of the known spiral galaxies. Based on the first kinetic energy component T and the total gravitational energy W, a galaxy will become barred when .
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| dbo:abstract | In astronomy, the Ostriker–Peebles criterion, named after its discoverers Jeremiah Ostriker and Jim Peebles, describes the formation of barred galaxies. The rotating disc of a spiral galaxy, consisting of stars and solar systems, may become unstable in a way that the stars in the outer parts of the "arms" are released from the galaxy system, resulting in the collapse of the remaining stars into a bar-shaped galaxy. This occurs in approximately 1/3 of the known spiral galaxies. Based on the first kinetic energy component T and the total gravitational energy W, a galaxy will become barred when . (en) In astronomia, il criterio di Ostriker-Peebles, che prende il nome dai suoi scopritori Jeremiah Ostriker e James Peebles, descrive la formazione delle galassie barrate. Il disco rotante di una galassia a spirale, costituito da stelle e sistemi planetari, può diventare instabile al punto che le stelle nelle parti più esterne dei "bracci" sono espulse dal sistema galattico, determinando il collasso delle stelle rimanenti verso la formazione di una galassia barrata. Questo accade in approssimativamente un terzo delle galassie a spirale conosciute. Data l'energia cinetica rotazionale totale (in moto ordinato) Trot e l'energia potenziale totale del sistema W, una galassia diventa barrata quando circa. (it) 在天文学中， 欧斯垂克–皮布尔斯判据（Ostriker–Peebles criterion）以它的发现者耶利米·欧斯垂克和吉姆·皮布尔斯命名，它描述了有棒星系的形成。 螺旋星系的旋转盘（旋转盘由恒星和行星系统组成）在旋臂外部的恒星脱离时会变得不稳定，将导致剩下的恒星塌缩形成棒状星系。 这种现象大约发生在1/3已知的螺旋星系中。 根据第一动能分量T 和总动能W，当星系满足 时，它将成为一个有棒星系。 (zh) |
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| rdfs:comment | In astronomy, the Ostriker–Peebles criterion, named after its discoverers Jeremiah Ostriker and Jim Peebles, describes the formation of barred galaxies. The rotating disc of a spiral galaxy, consisting of stars and solar systems, may become unstable in a way that the stars in the outer parts of the "arms" are released from the galaxy system, resulting in the collapse of the remaining stars into a bar-shaped galaxy. This occurs in approximately 1/3 of the known spiral galaxies. Based on the first kinetic energy component T and the total gravitational energy W, a galaxy will become barred when . (en) 在天文学中， 欧斯垂克–皮布尔斯判据（Ostriker–Peebles criterion）以它的发现者耶利米·欧斯垂克和吉姆·皮布尔斯命名，它描述了有棒星系的形成。 螺旋星系的旋转盘（旋转盘由恒星和行星系统组成）在旋臂外部的恒星脱离时会变得不稳定，将导致剩下的恒星塌缩形成棒状星系。 这种现象大约发生在1/3已知的螺旋星系中。 根据第一动能分量T 和总动能W，当星系满足 时，它将成为一个有棒星系。 (zh) In astronomia, il criterio di Ostriker-Peebles, che prende il nome dai suoi scopritori Jeremiah Ostriker e James Peebles, descrive la formazione delle galassie barrate. Il disco rotante di una galassia a spirale, costituito da stelle e sistemi planetari, può diventare instabile al punto che le stelle nelle parti più esterne dei "bracci" sono espulse dal sistema galattico, determinando il collasso delle stelle rimanenti verso la formazione di una galassia barrata. Questo accade in approssimativamente un terzo delle galassie a spirale conosciute. (it) |
| rdfs:label | Criterio di Ostriker-Peebles (it) Ostriker–Peebles criterion (en) 欧斯垂克–皮布尔斯判据 (zh) |
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