出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We discuss the role that numerical effects have in cosmological N-Body/SPH simulations of disk
galaxy formation. We show that the resolution of current state-of-the-art calculations, about 105
SPH and dark matter particles within the virial radius of a Milky Way-sized halo at z = 0, is
just enough to avoid articial losses of angular momentum and dramatic numerical disk heating
during the phase of disk assembly. Instead both effects will still be an issue at earlier epochs,
when the progenitors of the nal galaxies are resolved by signicantly less than 105 particles.
This must be at least partially responsible for why simulations show a ubiquitous low angular
momentum spheroid that is too massive compared to that of typical disk galaxies.
