S316p.100 — The initial conditions of observed star clusters

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Aug 10th at 6:00 PM until 7:30 PM

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Author(s): Janatie Tjibaria Pijloo2, Simon Portegies Zwart1, Poul Alexander4, Mark Gieles5, Soeren Larsen2, Paul Groot2, Bernadetta Devecchi3

Institution(s): 1. Leiden University, 2. Radboud University, 3. TNO Defence, 4. University of Cambridge, 5. University of Surrey

What were the initial conditions of the star clusters we observe today? Answering this question not only requires accurate observations of their current conditions, but also proper modeling of star cluster evolution over a large amount of time (for a globular cluster typically 12 Gyr). We constrain the initial conditions of observed star clusters in mass and half-mass radius, which provides a starting point for future N-body calculations. To this end we have coupled the fast, parametrized star cluster evolution code EMACSS to the Markov Chain Monte Carlo code emcee within the Astrophysical Multipurpose Software Environment AMUSE, providing a method to determine distributions of probable initial conditions of observed star clusters. In this talk we show how we validated our method and we apply it to observed star clusters in the Galaxy.