Interstellar deuteroammonia Tracing physical conditions in dense, cold interstellar medium

摘要

Close to 30 deuterated molecules have now been detected in the ISM, including doubly-deuterated species D₂H+, ND₂H, D₂CO, CHD₂OH, D₂S, and D₂CS, as well as triply-deuterated ammonia and methanol. We review the current understanding of depletion and deuteration processes in cold, dense interstellar medium (ISM) and discuss the utility of deuteroammonia as a tracer of the physical conditions and kinematics of cold, dense gas.