A Direct Measurement of Galaxy Major and Minor Merger Rates and Stellar Mass Accretion Histories at Z < 3 Using Galaxy Pairs in the REFINE Survey

被引：39
作者：
Conselice, Christopher J. [1 ,2 ]
Mundy, Carl J. [2 ]
Ferreira, Leonardo [2 ]
Duncan, Kenneth [2 ]
机构：
[1] Univ Manchester, Jodrell Bank Ctr Astrophys, Dept Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England
[2] Univ Nottingham, Ctr Astron & Particle Phys, Sch Phys & Astron, Nottingham NG7 2RD, England
来源：
ASTROPHYSICAL JOURNAL | 2022年 / 940卷 / 02期
基金：
欧洲研究理事会;
关键词：
STAR-FORMATION RATES; ILLUSTRISTNG SIMULATIONS; SIZE EVOLUTION; NUMBER DENSITY; PHOTOMETRIC REDSHIFTS; POPULATION SYNTHESIS; ELLIPTIC GALAXIES; COSMOS; STATISTICS; FRACTION;
D O I：
10.3847/1538-4357/ac9b1a
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We measure the role of major and minor mergers in forming the stellar masses of galaxies over redshifts 0 < z < 3 using a combination of & SIM;3.25 deg(2) of the deepest ground-based near-infrared imaging taken to date (Ultra Deep Survey, Ultra-VISTA, and VIDEO) as part of the collated REFINE survey. We measure the pair fraction and merger fractions for galaxy mergers of different mass ratios, and quantify the merger rate with newly measured timescales derived from the Illustris simulation as a function of redshift and merger mass ratio. For a M (*) > 10(11) M (& ODOT;) selection, we find that over 0 < z < 3 major mergers with mass ratios greater than 1:4 occur 0.84(-0.2)(+0.3) * > 10(11) M (& ODOT;) selection. We thus find that major mergers add more stellar mass to galaxies than minor mergers over this epoch. Overall, mergers will more than double the mass of massive galaxies over this epoch when selecting by stellar mass. We however find a lower increase in stellar mass when selecting by a constant number density. Finally, we compare our results to simulations, finding that minor mergers are overpredicted in Illustris and in semi-analytical models, suggesting a mismatch between observations and theory in this fundamental aspect of galaxy assembly.
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页数：22
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