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We present a search for linear polarization at 22 GHz, 43 GHz and 86 GHz from the nearest super massive black hole candidate, Sagittarius A*. We find upper limits to the linear polarization of 0. 2%, 0. 4% and 1%, respectively. These results strongly support the conclusion of our centimeter wavelength spectro-polarimetry that Sgr A* is not depolarized by the interstellar medium but is in fact intrinsically depolarized. Subject headings: Galaxy: center --- galaxies: active --- scattering --- polarization -- 3 -- 1. Introduction The compact non-thermal radio source Sgr A* is recognized as one of the most convincing massive black hole candidates (Maoz 1998). Recent results from stellar proper motion studies indicate that there is a dark mass of ¸ 2: 6 \ 10 6 M fi enclosed within 0. 01 pc (Genzel et al. 1997, Ghez et al. 1998). Very long baseline interferometry studies at millimeter wavelengths have shown that the intrinsic radio source coincident with the dark mass has a size that. . .
Bower et al. (Mon,) studied this question.