Dear All,
This week for the cosmology seminar we will have Chris Short from Sussex:
Combining semi-analytic models of galaxy formation with simulations of
galaxy clusters
X-ray observations of galaxy clusters have established that there is
much less cold gas in cluster cores than predicted. The most likely
explanation for this defecit is that energy feedback from galaxies
offsets radiative losses. To date, the most successful theoretical tool
for the study of galaxy formation physics is so-called semi-analytic
models (SAMs). However, existing SAMs are designed purely to reproduce
the properties of the observed galaxy distribution. We aim to extend the
predictive power of these models by investigating the effect of feedback
from model galaxies on the intracluster medium (ICM). This is done by
employing a novel hybrid approach which couples SAMs to cosmological
N-body hydrodynamical simulations. We assess the impact of feedback from
model galaxies on intracluster gas by focusing on two key observables of
galaxy groups and clusters: the X-ray luminosity-temperature relation
and the halo gas fraction. It is shown that SAMs can reproduce the
observational data, but only if there is a large energy input from
active galactic nuclei (AGN).
The seminar will be on Fri 06/02 at 12 noon in room H503 in South
Kensington Campus.
We will go to lunch with the speaker at 1pm.
Cheers,
Paniez
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