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The origin of the Galactic center diffuse X-ray emission (GCDX) is stillunder intense investigation. We have found a clear excess in a longitudinalGCDX profile over a stellar number density profile in the nuclear bulge region,suggesting a significant contribution of diffuse, interstellar hot plasma tothe GCDX. We have estimated that contributions of an old stellar population tothe GCDX are about 50 % and 20 % in the nuclear stellar disk and nuclear starcluster, respectively. Our near-infrared polarimetric observations show thatthe GCDX region is permeated by a large scale, toroidal magnetic field.Together with observed magnetic field strengths in nearly energy equipartition,the interstellar hot plasma could be confined by the toroidal magnetic field.

The Origin of the Galactic Center Diffuse X-ray Emission Investigated by Near-infrared Imaging and Polarimetric Observations