Bibcode
Schaller, M.; Dalla Vecchia, C.; Schaye, Joop; Bower, Richard G.; Theuns, Tom; Crain, Robert A.; Furlong, Michelle; McCarthy, Ian G.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 3, p.2277-2291
Fecha de publicación:
12
2015
Número de citas
211
Número de citas referidas
203
Descripción
We present results from a subset of simulations from the `Evolution and
Assembly of GaLaxies and their Environments' (EAGLE) suite in which the
formulation of the hydrodynamics scheme is varied. We compare
simulations that use the same subgrid models without recalibration of
the parameters but employing the standard GADGET flavour of smoothed
particle hydrodynamics (SPH) instead of the more recent state-of-the-art
ANARCHY formulation of SPH that was used in the fiducial EAGLE runs. We
find that the properties of most galaxies, including their masses and
sizes, are not significantly affected by the details of the
hydrodynamics solver. However, the star formation rates of the most
massive objects are affected by the lack of phase mixing due to spurious
surface tension in the simulation using standard SPH. This affects the
efficiency with which AGN activity can quench star formation in these
galaxies and it also leads to differences in the intragroup medium that
affect the X-ray emission from these objects. The differences that can
be attributed to the hydrodynamics solver are, however, likely to be
less important at lower resolution. We also find that the use of a
time-step limiter is important for achieving the feedback efficiency
required to match observations of the low-mass end of the galaxy stellar
mass function.
Proyectos relacionados
Astrofísica Numérica: Formación y Evolución de Galaxias
Entre las cuestiones fundamentales en Astronomía y Astrofísica están la formación y evolución de galaxias. Las escalas de tiempo y tamaño son tan astronómicas que su observación en galaxias individuales es imposible. Solo con el uso de simulaciones numéricas es posible entender la formación de estructuras cósmicas dentro del actual marco
Claudio
Dalla Vecchia