A massive “core” associated with the UC HIi region G31.41+0.31
We have used the IRAM Plateau de Bure Interferometer to observe the ground state and vibrationally excited lines of methyl cyanide towards the UC HIi region G31.41+0.31. We also obtained a map of the continuum emission at a frequency of 110 GHz. We detect a hot molecular core in the emission both of methyl cyanide and of the 110 GHz continuum. We estimate a temperature of 200 K and a mass of 1000 M⊙ for this compact massive region. We also detect a velocity gradient or shift across the methyl cyanide core whose origin could be due to rotation.
KeywordsContinuum Emission Maser Spot Molecular Core Channel Velocity Excited Line
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