Abstract
40″ resolution observations of the (1, 1) and (2, 2) ammonia transition lines toward the molecular core in the AFGL 5157 region are presented. The observed high-density condensation has a size of 1.3' × ≤ 0.7'. This structure has an orientation perpendicular to the axis of the bipolar molecular outflow previously observed in the region. The mass of the ammonia core is much larger than the mass of the bipolar molecular outflow. These results suggest that the observed elongated molecular condensation preceded, rather than followed, the outflow phenomenon phase, and that it can play an important role in the collimation processes at interstellar scales
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