galactocentric distance meaning in English

银心距

The calculating results show : ( 1 ) most of samples are located in 5 kpc - 10 kpc from galactic center . all of the sample clusters present a spherical symmetrical distribution around the galactic center , and their space velocities are presented a ellipsoidal distribution ; ( 2 ) according to the metallicity and basic characters , the sample clusters are separated into hb subgroup and mp subgroup . the number of samples are changed with metallicity [ fe / h ] , and there is a peak at [ fe / h ] = - 1 . 6 ; ( 3 ) the orbits of sample clusters show mostly limited , periodic characteristics , but the orbits are not closed completely , their maximal galactocentric distance is less than 40 kpc
计算结果表明： ( 1 )大部分样本星团都位于银心距5kpc 10kpc的范围内，相对于银心呈球对称分布，它们的速度也呈椭球分布； ( 2 ) 29个样本星团按其金属度大小和基本性质分类，可分属hb和mp两个球状星团次系，且样本星团数随金属度[ fe h ]而变化，在[ fe h ] = - 1 . 6处出现一个峰值； ( 3 )所有样本星团的轨道运动都呈周期性，大都在一个有界而不封闭的周期轨道上运动，其最大银心距都在40kpc以内。