High-Velocity Hot Ammonia in Bipolar Outflows

摘要: We have detected high-velocity ammonia emission associated with four bipolar molecular outflows excited by young stars (L1157, L1448, IRAS 3282, and NGC 2071). The is more prominent in the (3, 3) line, although it also (1, 1), (2, 2), (4, 4) lines. deduce that accelerated gas heated to than 50-100 K, i.e., a factor of 3-7 over ambient temperatures (which are range 12-26 K). Such temperatures, when taken into account analysis previous SiO observations, confirm shocked material rather dense [n(H 2 )∼10 5 cm −3 ]