On the hydrodynamics of the matter reinserted within superstellar clusters

Details On the hydrodynamics of the matter reinserted within superstellar clusters On the hydrodynamics of the matter reinserted within superstellar clusters

2006-12-07

arxiv.org/abs/astro-ph/0612184v1

Astronomy and Astrophysics

Astrophysics

18 pages, 6 figures, accepted for publication in ApJ

Scientific paper

10.1086/511671

We present semi-analytical and numerical models, accounting for the impact of radiative cooling on the hydrodynamics of the matter reinserted as strong stellar winds and supernovae within the volume occupied by young, massive and compact superstellar clusters. First of all we corroborate the location of the threshold line in the mechanical energy input rate vs the cluster size plane, found by Silich et al. (2004). Such a line separates clusters able to drive a quasi-adiabatic or a strongly radiative wind from clusters in which catastrophic cooling occurs within the star cluster volume. Then we show that the latter, clusters above the threshold line, undergo a bimodal behavior in which the central densest zones cool rapidly and accumulate the injected matter to eventually feed further generations of star formation, while the outer zones are still able to drive a stationary wind. The results are presented into a series of universal dimensionless diagrams from which one can infer: the size of the two zones, the fraction of the deposited mass that goes into each of them and the luminosity of the resultant winds, for clusters of all sizes and energy input rates, regardless the assumed adiabatic terminal speed V_A.

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