查看“Galaxy Merge”的源代码

==Simulation==
* 'Identikit' software (Barnes & Hibbard 2009) : merge的状态

*星系的次并合对spin的影响不大，主并合又分两种情况[https://arxiv.org/abs/1703.00545]、
:fast rotator : 质量较小的merge，气体较多，merge之后可以重新获得气体和恒星，从而获得spin
:slow rotator: 质量较大的merge，气体少，并合消耗spin，因而最终是slow rotator

==galaxy pair==
*大星系周围的非常close的satellite计数 [http://adsabs.harvard.edu/abs/2014MNRAS.442..347R]
: If the satellites eventually infall into the host galaxies, the merger channel will be largely dominated by satellites with a mass ratio down to 1:10,(as these objects have 68 per cent of the total mass in satellites).