A statistical study towards the high-mass BGPS clumps with the MALT90 survey
Abstract
In this work, we perform a statistical investigation towards 50 high-mass clumps using the data from the Bolocam Galactic Plane Survey (BGPS) and the 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 virous evolutionary stages since they are detected in all the fields. And 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 the transformation of N2H+ and HC3N to HCO+ as the clumps evolve. We also find that C2H is the most abundant molecule with an order of 10-8. Besides, three new infall candidates G010.214-00.324, G011.121-00.128, and G012.215-00.118(a) are discovered to have large-scaled infall motions and infall rates in the magnitude of 10-3 M yr-1.
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