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The linearly polarized millimeter and sub-millimeter emission in SagittariusA* is produced within 10 Schwarzschild radii of the supermassive black hole atthe Galactic Center and may originate from a hot magnetized accretion disk,where electrons are heated efficiently by turbulent plasma waves. In such ascenario, the flux density and polarization are very sensitive to the electronheating rate and the inclination angle of disk, respectively, and the majoraxis of the sub-millimeter intrinsic polarization, which is aligned with therotation axis of the disk, is perpendicular to the major axis of the polarizednear-infrared emission. In combination with MHD simulations, which study theproperties of the magnetic field and viscous stresses, the current spectral andpolarization measurements give tight constraints on the model parameters.Simultaneous observations will be able to test the model.

The Nature of Linearly Polarized Millimeter and Sub-millimeter Emission in Sagittarius A*