L1157: Interaction of the molecular outflow with the class 0 environment

摘要: We present high angular resolution interferometric observations of the dust continuum at 2.7 and 1.3 mm, HC 3 N ($J=12\to11$) C 18 O ($J=2\to1$) emission around L1157-mm, a Class 0 object that drives spectacular molecular outflow. The millimeter is clearly resolved into two components, flattened compact source ~$450\times250$ AU mass ~0.1 $M_\odot$, plus an extended envelope ~3000 AU ~1.1 $M_\odot$. spectral index varies throughout region, with lower value found toward protostar, possibly indicating grain growth in denser regions. A strong interaction between outflow close protostellar environment taking place affects structure innermost parts envelope. This shown by spatial coincidence (1.3 mm continuum) N emission: both tracers show structures associated to edges lobes. Basically, global picture sketched for L1157-mm Gueth et al. ([CITE]) supported. find possible evidence infall, but we do not detect any velocity gradient indicative rotating circumstellar disk.