论文标题
尘埃破坏和灰尘生长在星际介质的演变中的作用
The role of dust destruction and dust growth in the evolution of the interstellar medium
论文作者
论文摘要
我们使用银河系的化学动力学模拟，并采用新的治疗方法来破坏尘埃和生长，以研究这两个过程如何影响星系中星际培养基的性质。我们专注于两个特定参数的作用：f_des（一个新参数，确定在超新星周围的单个气体粒子中破坏的灰尘的比例）和C_S（金属原子或离子碰撞后的灰尘颗粒的可能性，即粘附后的粉尘颗粒，即粘性系数，粘附的系数），以调节尘埃和冷气和气体的分布。我们发现，模拟的具有低F_DE和/或高C_S值的模拟星系不仅会产生更多的灰尘，而且还会产生灰尘表面密度与总气体表面密度之间的较浅相关性，并且尘埃气和金属性之间的相关性更高。仅对于0.01至0.02之间的F_DE值和0.5和1之间的C_S的值，我们的模拟会产生与观测值一致的灰尘与气体比与金属关系关系的平均斜率。 F_DES值对应于由单个超新星在0.42和0.44之间销毁的总尘埃范围的范围。最后，我们将几个模拟的预测（具有不同的恒星配方，气体分数，中心金属性和金属性梯度）与空间分辨的M101星系进行了比较，并得出结论，金属性是粉尘的空间分布的主要驱动力，而粉尘比则控制着冷气的量化，从而控制了冷热量，从而使量化的量汇总了量化的量。
We use Milky Way-like chemodynamical simulations with a new treatment for dust destruction and growth to investigate how these two processes affect the properties of the interstellar medium in galaxies. We focus on the role of two specific parameters: f_des (a new parameter that determines the fraction of dust destroyed in a single gas particle surrounding supernova) and C_s (the probability that a metal atom or ion sticks to the dust grain after colliding, i.e., the sticking coefficient) in regulating the amount and distribution of dust, cold gas and metals in galaxies. We find that simulated galaxies with low f_des and/or high C_s values produce not only more dust, but they also have a shallower correlation between dust surface density and total gas surface density, and a steeper correlation between dust-to-gas ratio and metallicity. Only for values of f_des between 0.01 and 0.02, and of C_s between 0.5 and 1 our simulations produce an average slope of the dust-to-gas ratio versus metallicity relation consistent with observations. f_des values correspond to a range of a total fraction of dust destroyed by a single supernova between 0.42 and 0.44. Lastly, we compare predictions of several simulations (with different star formation recipes, gas fractions, central metallicities, and metallicity gradients) to the spatially resolved M101 galaxy, and conclude that metallicity is the primary driver of the spatial distribution of dust, while dust-to-gas ratio controls the cold gas distribution, as it regulates the atomic-to-molecular hydrogen conversion rate.
