Loubser, S.I.2020-06-042020-06-042020Loubser, S.I. 2020. Dynamical modelling of brightest cluster galaxies: constraints on the IMF. Proceedings of the International Astronomical Union, 14(Symposium 353):257-258. [https://doi.org/10.1017/S1743921319008093]1743-92131743-9221 (Online)http://hdl.handle.net/10394/34731https://doi.org/10.1017/S1743921319008093We study the stellar and dynamical masses, as well as the stellar populations, of brightest cluster galaxies (BCGs) located in 32 massive clusters, and for a sub-sample of these use the results to place constraints on the Initial Mass Function (IMF). We measure the spatially-resolved stellar population properties of the BCGs, such as recent star formation episodes, and use it to predict their stellar mass-to-light ratios (ϒ*POP). We find that ∼60 per cent of the BCGs have constant ϒ*POP over the radial range (<15 kpc). We also use the stellar and dynamical mass profiles to derive the stellar mass-to-light ratio from dynamics (ϒ*DYN, see Loubser, these proceedings). We directly compare ϒ*POP with ϒ*DYN, and find that for most BCGs, a Salpeter IMF is needed to explain their properties, but we also find a small subset of BCGs for which a Kroupa-like IMF is needed to explain their propertiesenGalaxies: clusters: generalGalaxies: elliptical and lenticularcDGalaxies: kinematics and dynamicsPresentation