The emergence of the galactic stellar mass function from a non-universal IMF in clusters
Niels Bohr International Academy, Niels Bohr Institute,
2 Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada
Accepted: 9 February 2018
We investigate the dependence of a single-generation galactic mass function (SGMF) on variations in the initial stellar mass functions (IMF) of stellar clusters. We show that cluster-to-cluster variations of the IMF lead to a multi-component SGMF where each component in a given mass range can be described by a distinct power-law function. We also show that a dispersion of ≈0.3 M⊙ in the characteristic mass of the IMF, as observed for young Galactic clusters, leads to a low-mass slope of the SGMF that matches the observed Galactic stellar mass function even when the IMFs in the low-mass end of individual clusters are much steeper.
Key words: stars: luminosity function, mass function / galaxies: clusters: general / galaxies: stellar content / open clusters and associations: general
© ESO 2018