Finding satellite galaxy pairs similar to Local Group in cosmological simulations
To test models of cosmology or galaxy formation,the unique observation data on the phase space distribution of Local Group satellite galaxies were used to study the similarity between observation and cosmological simulation from the perspective of satellite pairs.In the cosmological simulation data combined with the semi-analytic model,samples of Milky Way-like and Andromeda-like were selected respectively,and the proportion of the paired satellite galaxies in the larger samples was calculated by using the phase space criterion similar to those used before.It is find that the proportion of satellite galaxy pairs in the simulation is much smaller than that of observations.This result is basically consistent with the previous studies,and the difference between simulation and observation can be partially reduced by using the projected velocity which is closer to observation for Andromeda-like samples.In addition,the"orphan"satellite galaxies,whose positions and velocities are with large uncertainties in the simulation,has no significant effect on the above results.
pair of satellitescosmological modelsemi-analytic model of galaxy formationLocal Group
万方数据
维普
