论文标题
在W51 E2E中的CS（$ v = 0 $）的泵送（$ v = 0 $）
On the pumping of the CS($v=0$) masers in W51 e2e
论文作者
论文摘要
我们介绍了在地面振动状态下CS的前31个旋转状态的数值求解的结果，以确定j = 1-0，j = 2-1和j = 3-2的过渡以产生maser发射的条件。我们结果的本质是，CS（$ v = 0 $）碰撞泵送，并且根据光谱能量分布，灰尘发射可以抑制果酱。除了J = 1-0和J = 2-1 MASERS外，计算还表明J = 3-2的过渡可以倒置以产生MASER发射。发现要解释W51 E2E中最近发现的CS Masers观察到的亮度温度是必要的。该模型计算表明，CS丰度几次$ 10^{ - 5} $和CS（$ v = 0 $）列的列$ 10^{16} \，\ Mathrm {cm^{ - 2}} $是这些masers所需的。高质量恒星形成区域中CS Masers的稀有性可能是所需的高CS丰度以及由于热核内部和外部的Maser发射的衰减所致。
We present the results of numerically solving the rate equations for the first 31 rotational states of CS in the ground vibrational state to determine the conditions under which the J=1-0, J=2-1 and J=3-2 transitions are inverted to produce maser emission. The essence of our results is that the CS($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.
