HIGHLY POLARIZED ~(28)SiO MASER EMISSION IN J = 1-0, v = 0 FROM ORION-KL IRc2

摘要

Polarimetry observations of ~(28)SiO (v = 0,1, and 2,J = 1-0) emission lines from a massive-star-forming region, Orion-KL IRc2, were made using the Nobeyama 45 m telescope. The / spectrum of ~(28)SiO (v = 0, J = 1-0) emission has a double-peaked line profile which is similar to those of the v = 1 and 2 emissions. We have detected highly linear polarized, up to p = 80%, ~(28)SiO (v = 0,J = 1-0) emission at the blueshifted peak. This provides strong evidence of ground vibrational state maser emission of ~(28)SiO (v = 0,J = 1-0).