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Using archive data from the Millimeter Astronomy Legacy Team Survey at 90 GHz(MALT90), carried out using the Mopra 22-m telescope, we made the firstmulti-transition molecular line study of infrared dark cloud (IRDC) MSXDCG331.71+00.59. Two molecular cores were found embedded in this IRDC. Each ofthese cores is associated with a known extended green object (EGO), indicatingplaces of massive star formation. The HCO+ (1-0) and HNC (1-0) transitions showprominent blue or red asymmetric structures, suggesting outflow and inflowactivities of young stellar objects (YSOs). Other detected molecular linesinclude H13CO+ (1-0), C2H (1-0), HC3N (10-9), HNCO(404-303) and SiO (2-1),which are typical of hot cores and outflows. We regard the two EGOs as evolvingfrom the IRDC to hot cores. Using public GLIMPS data, we investigate thespectral energy distribution of EGO G331.71+0.60. Our results support this EGObeing a massive YSO driving the outflow. G331.71+0.58 may be at an earlierevolutionary stage.

A multi-transition molecular line study of infrared dark cloud G331.71+00.59