论文标题
Prestellar核心的CS耗竭
CS Depletion in Prestellar Cores
论文作者
论文摘要
已知CS分子在寒冷和致密的条件下被吸收到灰尘上，从而导致其在核心中部地区显着耗尽。这项研究的目的是使用光学薄的C $^{34} $ S分子线观测来研究CS分子的耗竭。我们使用两条分子线，C $^{34} $ s $（J = 2-1）$和N $ _2 $ _2 $ h $ h $^+$ $（J = 1-0）$与NRO 45-5-M5-telescope de toughers core core core tore de toughling torbe，我们绘制了五个Prestelar核心，L1544，L1544，L1552，L1552，L1689B，L694-2和L1197使用C $^{34} $ s进行探测。在我们的大多数目标中，c $^{34} $ s的发射的分布显示出表明CS分子通常在Prestellar核心中心耗尽的特征。 CS丰度相对于直接从CS发射和Herschel Dust发射测量的H $ _2 $的径向曲线表明，CS分子被$ \ sim 3 $ \ sim 3耗尽，$ \ sim 3 $ \ sim 3 $ \ sim 3 $ \ sim 3。当消除沿周围信封中CS分子的存在引入的污染效应所引入的污染效果被沿沿线视线所取出时，耗尽的程度被一个数量级增强了。除L1197根据其观察到的物理参数被归类为我们目标中相对进化的核心的L1197外，我们发现其余的四个Prestellar核心在其中部地区的CS耗竭遭受了大量的CS耗竭，无论其进化状态的相对差异如何。
The CS molecule is known to be absorbed onto dust in the cold and dense conditions, causing it to get significantly depleted in the central region of cores. This study is aimed to investigate the depletion of the CS molecule using the optically thin C$^{34}$S molecular line observations. We mapped five prestellar cores, L1544, L1552, L1689B, L694-2, and L1197 using two molecular lines, C$^{34}$S $(J=2-1)$ and N$_2$H$^+$ $(J=1-0)$ with the NRO 45-m telescope, doubling the number of cores where the CS depletion was probed using C$^{34}$S. In most of our targets, the distribution of C$^{34}$S emission shows features that suggest that the CS molecule is generally depleted in the center of the prestellar cores. The radial profile of the CS abundance with respect to H$_2$ directly measured from the CS emission and the Herschel dust emission indicates that the CS molecule is depleted by a factor of $\sim$3 toward the central regions of the cores with respect to their outer regions. The degree of the depletion is found to be even more enhanced by an order of magnitude when the contaminating effect introduced by the presence of CS molecules in the surrounding envelope that lie along the line-of-sight is removed. Except for L1197 which is classified as relatively the least evolved core in our targets based on its observed physical parameters, we found that the remaining four prestellar cores are suffering from significant CS depletion at their central region regardless of the relative difference in their evolutionary status.
