SIMBAD references

2018RAA....18....4L - Research in Astron. and astroph., 18, 4-4 (2018/January-0)

A statistical study towards high-mass BGPS clumps with the MALT90 survey.

LIU X.-L., XU J.-L., NING C.-C., ZHANG C.-P. and LIU X.-T.

Abstract (from CDS):

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), C_ 2_H(1-0), HC3 N(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 N2H+ and HC3N transform to HCO+ as 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.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: abundance - ISM: molecules - radio lines: ISM - ISM: kinematics and dynamics

Simbad objects: 57

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