Orateur
Anna Silvia Baldi
(Sapienza University of Rome)
Description
The imaging of galaxy clusters through the Sunyaev-Zel'dovich effect is a valuable tool to probe
the thermal pressure of the intra-cluster gas especially in the outermost regions, where X-ray observations
suffer from photon statistics.
For the first time, we produce maps of the Comptonization parameter by applying a locally parametric algorithm for
sparse component separation to the latest *Planck* data.
Our sample consists of twelve low-redshift galaxy clusters detected by *Planck*
with the highest signal-to-noise ratio, considered for the XMM-Cluster Oustkirts Project (X-COP).
Our images of the thermal Sunyaev-Zel'dovich effect show the presence of anisotropic features, such as
small-scale blobs and filamentary substructures, located in the outskirts of a number of objects in the sample.
In particular, we present a qualitative comparison with X-ray data for two interesting systems, namely A2029 and
RXC1825. We use our maps to isolate and mask significant signal features in the virial region, in order to get unbiased pressure profiles of the intra-cluster gas.
Auteur principal
Anna Silvia Baldi
(Sapienza University of Rome)
Co-auteur
M.
Herve Bourdin
(University of Rome "Tor vergata")
