Invited Presentation

The Sunyaev-Zel'dovich effect observations with ALMA Band 3 and prospects for Band 1

Author(s): Tetsu Kitayama (Toho University)

Presenter: Tetsu Kitayama (Department of Physics, Toho University)

The Sunyaev-Zel'dovich effect (SZE), inverse Compton scattering of the
cosmic microwave background photons off weakly relativistic electrons,
provides a unique probe of cosmic plasma up to high redshifts. I will
present new measurements of the thermal SZE by ALMA in Band 3 to
foresee the capability of Band 1 for the SZE observations. We have
obtained an SZE image toward a distant galaxy cluster RXJ1347.5-1145
with 5" resolution (corresponding to the physical size of 20 kpc/h),
while retaining extended signals out to 40". Being proportional to the
integrated electron pressure, the SZE image shows distinct morphology
from the X-ray image and offers a new probe of small-scale structures
of the intracluster medium. I will also discuss implications of these
results on the evolution of galaxy clusters as well as prospects for
further SZE observations in Band 1.