Monday, June 3, 2013

1305.7463 (Jan Palous et al.)

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

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