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Paper: The Cluster Birthline and the Formation of Stellar Clusters in M33
Volume: 440, UP2010: Have Observations Revealed a Variable Upper End of the Initial Mass Function?
Page: 117
Authors: Corbelli, E.; Giovanardi, C.; Grossi, M.
Abstract: We present a new method to analyze the IMF at its high mass end in young stellar clusters, which relies on two integrated observables: the cluster bolometric and Hα luminosity. Using several cluster samples selected in M33 we show that a stochastically sampled universal IMF is in better agreement with the data than a truncated IMF whose maximum stellar mass depends on cluster mass. We also discuss the possibility that a delayed formation of massive stars is taking place in low density star forming regions as an alternative to a strong leakage of ionizing photons from HII regions of young luminous clusters.
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