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Measurement of chemical and kinematic structures in prestellar cores isessential for better understanding the star formation process. Here, we studythe three prestellar cores (TMC-1C, L1544, and TMC-1) of the Taurus molecularcloud by means of the thioxoethenylidene (CCS) radical and ammonia (NH3)molecule observed with Karl G. Jansky Very Large Array telescope in D, C, andCNB configurations. Our main results are based on the CCS observation of theTMC-1C core, showing complex structures are present. Spatial offset relative todust emission is observed in the CCS radical. Across a wide region around thedust peak, inward motion is found through the CCS radical. We have calculatedthe infall velocity and measured the turbulence inside the core. The turbulenceis found to be subsonic. We obtain the virial parameter {\alpha} is < 1. Thus,thermal and non-thermal motions cannot prevent the collapse. Spatialincoherence of the CCS and NH3 is observed from the integrated intensity mapsin these cores, suggesting that these molecules trace different environments ofthe cores.We compare the integrated flux densities of CCS with previoussingle-dish data and find that a small amount of flux is recovered in theinterferometric observations, indicating the presence of significant diffuseemission in favorable conditions for producing CCS.

monthly notices of the royal astronomical society

Studying the chemical and kinematical structures of dense cores TMC-1C,  L1544, and TMC-1 in the Taurus molecular cloud using the CCS and NH3  observations