Merging History of Massive Galaxies at 3

作　　者：Kemeng Li Zhen Jiang Ping He Qi Guo Jie Wang 

机构地区：[1]College of Physics,Jilin University,Changchun 130012,China [2]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [3]Department of Astronomy,Tsinghua University,Beijing 100084,China [4]Center for High Energy Physics,Peking University,Beijing 100871,China

出　　处：《Research in Astronomy and Astrophysics》2023年第1期100-107,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National Key R&D Program of China(Nos.2018YFE0202900 and 2022YFA1602901);the NSFC grant(Nos.11988101,11873051 and 12125302);NSFC grant(No.12033008);CAS Project for Young Scientists in Basic Research Grant(No.YSBR-062);the K.C.Wong Education Foundation;the National Key Research and Development of China(No.2018YFA0404503);the support by the National Natural Science Foundation of China(Nos.12047569 and 12147217);the science research grants from the China Manned Space Project with Nos.CMSCSST-2021-A03 and CMS-CSST-2021-A07;by the Natural Science Foundation of Jilin Province,China(No.20180101228JC)。

摘　　要：The observational data of high redshift galaxies become increasingly abundant,especially since the operation of the James Webb Space Telescope,which allows us to verify and optimize the galaxy formation model at high redshifts.In this work,we investigate the merging history of massive galaxies at 3<z<6 using a well-developed semi-analytic galaxy formation catalog.We find that the major merger rate increases with redshift up to 3 and then flattens.The fraction of wet mergers,during which the sum of the cold gas mass is higher than the sum of the stellar mass in two merging galaxies,also increases from~34%at z=0 to 96%at z=3.Interestingly,almost all major mergers are wet at z>3.This can be attributed to the high fraction(>50%)of cold gas at z>3.In addition,we study some special systems of massive merging galaxies at 3<z<6,including the massive gas-rich major merging systems and extreme dense proto-clusters,and investigate the supermassive black hole-dark matter halo mass relation and dual active galactic nuclei.We find that the galaxy formation model reproduces the incidence of those observed massive galaxies,but fails to reproduce the relation between the supermassive black hole mass and the dark matter halo mass at z~6.The latter requires more careful estimates of the supermassive black hole masses observationally.Otherwise,it could suggest modifications of the modeling of the supermassive black hole growth at high redshifts.

关 键 词：GALAXIES evolution-galaxies formation-galaxies high-redshift-(galaxies:)quasars supermassive black holes 

分 类 号：P152[天文地球—天文学]