The interaction between protostars and their environment: Carbon-bearing species towards low mass protostars

摘要: It is clear that outflow activity can have a signicant impact on the structure and evolution of material in protostellar environments, but detailed nature interaction between surrounding not clearly understood. To probe core material, this paper we present observations CH3OH (Jk =3 k! 2k), c-C3H2 ;k+ 1;2! 22;1) DCN (J =2 ! 1 multiplet) at 145 GHz towards sample Class 0 I sources, to place constraints physical chemical changes which taken through onset star formation. was detected all sources positions observed. In many lines two velocity components: one broad (hv i 1.5 km s ), narrow i0.7 ). Both components show signicantly (>10) enhanced abundances relative quiescent dark clouds. These are predominantly feature sources. also broadest both components. 87% observed 66% The narrowest component has similar linewidths NH3, only small fraction positions, implying number contain undisturbed material. degree implied by larger than Since narrower linewidth molecule, conclude energetic during formation process, may include infall processes, aects apparently very early process.