论文标题
嵌入在巨大引力中心远处的湍流气云中的非等量二进制碰撞的模拟
Simulations of un-equal binary collisions embedded in a turbulent gas cloud far away of a massive gravitational center
论文作者
论文摘要
我们使用基于粒子的代码gadget2模拟了湍流气云的崩溃。我们选择了两个子云，由位于中心周围的粒子$ \ vec {r} _l $和$ \ vec {r} _r $以及Radii $ r_l $和$ r_r $形成。添加了翻译速度$ \ vec {v} _l $或$ \ vec {v} _r $，因此子云彼此相互碰撞。子云的半径和前绕速度被选择为非平等，并且都考虑了正面和倾斜的碰撞。模拟都经过校准为具有相同的总质量和初始能量比$α= 0.16 $，这定义为热能与重力能的比率。我们将低$β$模型与高$β$模型进行比较，其中$β$定义为动能与重力能的比率。最后，我们认为湍流的云处于足够远的物体的重力影响下，以通过方位角速度$ v _ {\ rm cir} $近似潮汐效应，除了上面提到的翻译速度和湍流速度外，还添加到云粒子中。我们将低$ v _ {\ rm cir} $模型与高$ v _ {\ rm cir} $进行比较。
We simulate the collapse of a turbulent gas cloud with the particle-based code Gadget2. We choose two sub-clouds, formed by those particles located around the centers $\vec{r}_L$ and $\vec{r}_R$ and within the radii $r_L$ and $r_R$, respectively. A translational velocity $\vec{v}_L$ or $\vec{v}_R$ is added, so that the sub-clouds move towards each other to collide. The radius and pre-collision velocity of the sub-clouds are chosen to be un-equal, and both head-on and oblique collisions are considered. The simulations are all calibrated to have the same total mass and the initial energy ratio $α=0.16$, which is defined as the ratio of thermal energy to gravitational energy. We compare low-$β$ models to a high-$β$ models, where $β$ is defined as the ratio of kinetic energy to gravitational energy. Finally, we consider the turbulent cloud to be under the gravitational influence of an object located far enough, in order to approximate the tidal effects by means of an azimuthal velocity $V_{\rm cir}$ added to the cloud particles in addition to the translational and turbulent velocities mentioned above. We compare a low-$V_{\rm cir}$ model with a high-$V_{\rm cir}$ one.
