Sami Dib (Niels Bohr Institute, Denmark)

The Milky Stellar Clusters meet statistics: Evidence for a non-universal IMF
When Mar 03, 2015 from 02:00 PM to 03:00 PM
  • Special Seminar
  • Colloquium
Where SH, seminar room
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I will present the results from two complementary studies that investigate the shape and universality of the IMF among Galactic stellar clusters. In the first study the universality of the IMF is tested using a sample of eight young stellar clusters IC 348, ONC, NGC 2024, NGC 6611, NGC 2264, ρ Ophiuchi, Chameleon I, and Taurus). I will show that the posterior probability distribution functions (pPDFs) of the IMF parameters, inferred using Bayesian statistics techniques, do not overlap within the 1-sigma uncertainty limit as well as with the value of the parameters for the Galactic field IMF. In the second study, the high mass star content of a larger survey of Galactic clusters is used to further test the universality of the IMF. In addition to confirming the IMF is not universal, the results of this study put strong constraints on the shape of the Galactic cluster mass function and rule out the existence of a cluster mass-maximum stellar mass relation.