Iberian AtLAST days

Magnetic Fields in the Shapley Supercluster of Galaxies

Not scheduled

2m

Facultad de Ciencias Físicas - Sala de grados (Universidad Complutense de Madrid)

Poster

Speakers

David Alonso López (Departamento de Física de la Tierra y Astrofísica, Universidad Complutense de Madrid & IPARCOS) Shane O'Sullivan (UCM & IPARCOS)

Description

We performed a statistical study of the ASKAP-POSSUM Rotation Measures . A higher scatter (standard deviation) of the RMs whose sightlines go through the SSC with respect to those that pass outside it, indicates the presence of a denser and more strongly magnetised plasma (on/off-target approach).

Our object of study, the Shapley Supercluster Core (z=0.05) is made up of two galaxy clusters (A3558 and A3562) and of two massive galaxy groups in the intercluster region between them.

We report the first detection of an excess RM signal from the SSC is consistent with ~μG magnetic field strengths agreement with previous studies of other clusters of galaxies. The data favors models in which magnetic field in the intercluster regions is amplified by the turbulent pressure of the ICM.

AtLAST complements these studies in the sub-mm regime by providing a way to break the degeneracy between the electron density and the magnetic field strength. This is possible via sensitive Sunyaev-Zeldovich observations.