Imaging polarimetry is a useful tool to reveal the 3D structure of dust distributions and to localize embedded young stellar objects. We present maps of the linear polarization at 2.2 micron for three ultra-compact HII regions (G192.16-3.82, G331.28-0.19, G339.88-1.26) and the methanol maser source G305.21+0.21. From the polarization maps, we draw conclusions on the morphology of these objects and the presence of luminous illuminating sources.
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