A statistical study towards high-mass BGPS clumps with the MALT90 survey
作者：Xiao-Lan Liu;Jin-Long Xu;Chang-Chun Ning;Chuan-Peng Zhang;Xiao-Tao Liu 单位：National Astronomical Observatories,Chinese Academy of Sciences;NAOC-TU Joint Center for Astrophysics;Tibet University;Department of Finance,Central China Normal University 2018年第01期
关键词:
stars:formation;ISM:abundance;ISM:molecules;radio lines:ISM;ISM:kinematics and dynamicsKeywords
stars:formation;ISM:abundance;ISM:molecules;radio lines:ISM;ISM:kinematics and dynamics
摘要
In this work,we perform a statistical investigation towards 50 high-mass clumps using data from the Bolocam Galactic Plane Survey（BGPS）and Millimetre Astronomy Legacy Team 90-GHz survey（MALT90）.Eleven dense molecular lines(N2H+（1–0）,HNC（1–0）,HCO+（1–0）,HCN（1–0）,HN13C（1–0）,H13CO+（1–0）,C2H（1–0）,HC3N（10–9）,SiO（2–1）,13CS（2–1）and HNCO(44,0-30,3))are detected.N2H+ and HNC are shown to be good tracers for clumps in various evolutionary stages since they are detected in all the fields.The detection rates of N-bearing molecules decrease as the clumps evolve,but those of O-bearing species increase with evolution.Furthermore,the abundance ratios[N2H+]/[HCO+]and log（[HC3N]/[HCO+]）decline with log（[HCO+]）as two linear functions,respectively.This suggests that N+2H+ and HC3N transform to HCOas the clumps evolve.We also find that C2H is the most abundant molecule with an order of magnitude 10-8.In addition,three new infall candidates,G010.214–00.324,G011.121–00.128 and G012.215–00.118（a）,are discovered to have large-scale infall motions and infall rates with an order of magnitude 10-3M⊙yr-1.
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