... optical depth of material is required to give polarisation; quite high polarisations can occur with large optical depths and well-aligned grains, for example the heavily obscured BecklinNeugebauer (BN) object in Orion has a 10 m polarisation of 12:5% [4 ...
... X-ray observations of massive YSOs did either detect no X-ray emission at all or failed to provide clear identifications of the X-ray source with the massive YSO (see e.g. Garmire et al. 2000 for the case of the BN object Orion). ...
... Journal compilation C 2010 RAS, MNRAS 404, 265274 Interstellar extinction and polarization OrionEridanus Super-bubble at a distance 150 pc and observed in Na I Dand Ca II lines (Genova & Beckman 2003; Welsh, Sallmen & Jelinsky 2005). ...
... Multiple scattering of polarized radiation by non-spherical grains Recently, very high degrees of circular polarization of scattered light in the Orion molecular cloud were measured by Chrysostomou et al. ...
... Some nebulae can be seen in the sky as extended luminous objects surrounding or close to bright hot stars and are known as diffuse nebulae, of which the best known representative is the Orion nebula. ...
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