arXiv 2011.104202020-11-26astro-ph.GA

关于e2e中CS（$v=0$）脉泽的抽运

On the pumping of the CS($v=0$) masers in W51 e2e

D. J. van der Walt, A. Ginsburg, C. Goddi

备注：: 13 pages, 15 figures
DOI：: 10.1093/mnras/staa3667

摘要：

本文给出了CS基态前31个转动态的速率方程的数值解，确定了J=1-0，J=2-1和J=3-2跃迁反转产生脉泽辐射的条件。结果表明，CS（$v=0$）脉泽是碰撞抽运的，尘埃辐射对脉泽的抑制作用取决于谱能量分布。除了J=1-0和J=2-1脉泽外，计算还表明J=3-2跃迁可以反转产生脉泽辐射。结果表明，用聚束效应解释最近在W51 e2 e发现的CS脉泽的亮温是必要的。模型计算表明，这些脉泽需要几倍于$10^{-5}$的CS丰度和$10^{16}\,\mathrm{cm^{-2}}$量级的CS（$v=0$）柱密度。CS脉泽在高质量恒星形成区的稀有性可能是所需的高CS丰度的结果，以及由于微波激射发射的衰减内部以及外部的热核。

英文摘要：

We present the results of numerically solving the rate equations for the first 31 rotational states of CS in the ground vibrational state to determine the conditions under which the J=1-0, J=2-1 and J=3-2 transitions are inverted to produce maser emission. The essence of our results is that the CS($v=0$) masers are collisionally pumped and that, depending on the spectral energy distribution, dust emission can suppress the masers. Apart from the J=1-0 and J=2-1 masers the calculations also show that the J=3-2 transition can be inverted to produce maser emission. It is found that beaming is necessary to explain the observed brightness temperatures of the recently discovered CS masers in W51 e2e. The model calculations suggest that a CS abundance of a few times $10^{-5}$ and CS($v=0$) column densities of the order $10^{16}\,\mathrm{cm^{-2}}$ are required for these masers. The rarity of the CS masers in high mass star forming regions might be the result of a required high CS abundance as well as due to attenuation of the maser emission inside as well as outside of the hot core.

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