A detailed modelling of the chemically rich clumps along the CB3 outflow
A detailed modelling of the chemically rich clumps along the CB3 outflow
复制标题
CB3 流出沿线富含化学物质的团块的详细模型
DOI：
10.1111/j.1365-2966.2006.10473.x
复制
发表时间：
2006
影响因子：
4.8
通讯作者：
INAF
中科院分区：
文献类型：
--
作者：
M. Benedettini;J. Yates;S. Viti;Claudio Codella INAF;UK Ucl;INAF
为了调查的起源和结构的低速，化学丰富的团块观察沿着的叶片的低和中等质量的外流，我们构建了一个详细的模型的S1团块沿着的CB 3流出。我们使用一个随时间变化的化学模型，再加上辐射传输模型来重现所观察到的线轮廓与以前的观察这个团块的直接比较。我们发现，同时拟合的多个物种和过渡是一个强大的工具，在约束的气体的物理参数。不同的情况下，团块形成进行了调查。更好地再现所有观测到的线的模型是那些在外流出现之前形成的团块，至少部分地;随着外流的出现，团块经历了一个短时间的非解离冲击，随后释放的冰冷的地幔连同高温化学导致观察到的化学富集。结果还表明，团簇内部存在着由CS、SO和CH 3OH的低能跃迁（3 K-2K和2K-1 K）组成的较扩展的亚结构，以及由H2 CO、SO2和CH 3OH的高能跃迁（5 K-4K）组成的较紧凑的亚结构.
In order to investigate the origin and the structure of the low-velocity, chemically rich clumps observed along the lobes of low- and intermediate-mass outflows, we construct a detailed model of the Sl clump along the CB3 outflow. We use a time-dependent chemical model coupled with a radiative transfer model to reproduce the observed line profile for a direct comparison with previous observations of this clump. We find that the simultaneous fitting of multiple species and transitions is a powerful tool in constraining the physical parameters of the gas. Different scenarios for the clump formation have been investigated. The models that better reproduce all the observed lines are those where the clump is formed, at least partially, before the advent of the outflow; with the advent of the outflow the clump undergoes a short period of non-dissociative shock and the consequent release of the icy mantle together with the high-temperature chemistry leads to the observed chemical enrichment. Our results also suggest the presence of substructure within the clump: a more extended component traced by CS, SO and the lower-energy transitions (3 K -2 K and 2 K -1 K ) of CH 3 OH, and a more compact component traced by H 2 CO, SO 2 and the higher-energy transitions (5 K -4 K ) of CH 3 OH.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell