X-ray, Sunyeav-Zel'dovich signal and dark matter in galaxy clusters
by
Stefano Ettori(INAF Osservatorio Astronomico, Bologna ITALY)
→
Europe/Rome
Aula Conversi (Dipartimento di Fisica - Ed. G. Marconi)
Aula Conversi
Dipartimento di Fisica - Ed. G. Marconi
Description
The distribution of the gravitating and baryonic mass in galaxy clusters is
key information to use them as astrophysical laboratories and cosmological
probes. I'll discuss the current status in reconstructing the radial profiles
of the gas mass, the total mass and other thermodynamical properties from
observations via X-rays and the Sunyeav-Zeldovich effect, highlighting the
present limitations and biases, in particular in the clusters' outskirts and
at high-redshift, where we have obtained the first constraint on the
concentration-mass relation at z>0.7 from X-ray analysis only.
I'll show how the best constraints available on the distribution of the
baryonic and hydrostatic mass in nearby clusters we have recently obtained
are in conflict with scenarios alternative to the cold dark matter. I'll
elucidate how Athena, the next-generation X-ray observatory and ESA-L2
mission, will address these issues.
