银河系核球 meaning in English

galactic bulge

The evolution time in our calculation is chosen to be 12 gyr , which is the mean value of globular cluster ages in the galaxy
恒星蒸发对小质量球状星团的演化起着主导作用，大质量恒星的演化、银河系核球和盘的冲击加热以及动力学磨擦则主要影响大质量球状星团的演化。
They are the stellar evaporation in the tidal field , the stellar evolution during the early evolutionary stage , the tidal shocks due to clusters passing through the bulge and disk , and the dynamical friction
本文考虑的动力学过程有四种，即：恒星蒸发、早期大质量恒星的演化、银河系核球和盘的冲击加热以及动力学磨擦。