Study on the Physical and Chemical Properties of a Thermally Inhibited Dense Structure in W51 IRS2
This work analyzes and processes high-resolution(0.028'')observation data of the W51 IRS2 region,a massive star-forming region,obtained by the ALMA.For the first time,an unfragmented,ultra-dense clump-like structure called CE1 was observed,with a mass greater than 13 solar masses and a density higher than 107.Vibrational(v8=1)and rotational(v=0)transitions of CH3CN molecule were detected in a total of 16 spectral transitions,and the parameters of CH3CN were calculated.From Jeans analysis,it was found that the temperature inside CE 1 should be higher than 400 K,and no obvious star formation activity was observed in-side.All the research results suggest that CE 1 is highly possible an"embryo"in a very early evolutionary stage of massive star formation.
massive star formationinterstellar mediummolecular spectrum
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