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arXiv 1305.7463astro-ph.GA
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具有Schuster质量分布的年轻星团- I:定常风

Young Stellar Clusters with a Schuster Mass Distribution - I: Stationary Winds

Jan Palous, Richard Wunsch, Sergio Martinez-Gonzalez, Filiberto Hueyotl-Zahuantitla, Sergiy Silich, Guillermo Tenorio-Tagle

摘要:

探讨了具有广义Schuster恒星密度剖面的年轻星团驱动球对称风的流体动力学模型。为此,我们使用半解析模型和一维数值模拟。我们确定的准绝热和辐射固定风的属性,并定义半径的流量从亚音速变成超音速的所有恒星密度分布。强辐射风会显著地降低它们的终端速度,因此它们的机械光度也会大大降低。这也减少了它们对宿主星系ISM的潜在负反馈。的临界光度以上的辐射冷却成为主导的集群内,导致热不稳定性,使风非静止的,被确定,并讨论了其对星团密度分布,核心半径和半质量半径的依赖。

英文摘要:

Hydrodynamic models for spherically-symmetric winds driven by young stellar clusters with a generalized Schuster stellar density profile are explored. For this we use both semi-analytic models and 1D numerical simulations. We determine the properties of quasi-adiabatic and radiative stationary winds and define the radius at which the flow turns from subsonic into supersonic for all stellar density distributions. Strongly radiative winds diminish significantly their terminal speed and thus their mechanical luminosity is strongly reduced. This also reduces their potential negative feedback into their host galaxy ISM. The critical luminosity above which radiative cooling becomes dominant within the clusters, leading to thermal instabilities which make the winds non-stationary, is determined, and its dependence on the star cluster density profile, core radius and half mass radius is discussed.

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