SIMULATIONS OF UNEQUAL BINARY COLLISIONS EMBEDDED IN A TURBULENT GAS CLOUD FAR FROM A MASSIVE GRAVITATIONAL CENTER

We simulate the collapse of a turbulent gas cloud with particle-based code Gadget2. choose two sub-clouds, formed by those particles located around centers $\vec{r}_L$ and $\vec{r}_R$ within radii $r_L$ $r_R$, respectively. A translational velocity $\vec{v}_L$ or $\vec{v}_R$ is added, so that sub-clouds move towards each other to collide. The radius pre-collision are chosen be un-equal, both head-on oblique collisions considered. simulations all calibrated have same total mass initial energy ratio $\alpha=0.16$, which defined as thermal gravitational energy. compare low-$\beta$ models high-$\beta$ models, where $\beta$ kinetic Finally, we consider under influence an object far enough, in order approximate tidal effects means azimuthal $V_{\rm cir}$ added addition velocities mentioned above. low-$V_{\rm model high-$V_{\rm one.