A consistent measure of the merger histories of massive galaxies using close-pair statistics - I. Major mergers at z < 3.5

被引：100

作者：

Mundy, Carl J. ^{[1
]}

Conselice, Christopher J. ^{[1
]}

Duncan, Kenneth J. ^{[1
,2
]}

Almaini, Omar ^{[1
]}

Haussler, Boris ^{[3
,4
,5
]}

Hartley, William G. ^{[1
,6
,7
]}

机构：

[1] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[2] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[3] Univ Oxford, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, Oxon, England

[4] Univ Hertfordshire, Hatfield AL10 9AB, Herts, England

[5] European Southern Observ, Alonso de Cordova 3107,Casilla 19001, Santiago, Chile

[6] Swiss Fed Inst Technol, Inst Astron, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[7] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 470卷 / 03期

基金：

英国科学技术设施理事会; 欧洲研究理事会;

关键词：

galaxies: evolution; galaxies: formation; galaxies: high-redshift; STAR-FORMATION RATES; GOODS NICMOS SURVEY; VLT DEEP SURVEY; SIMILAR-TO; ASSEMBLY GAMA; PHOTOMETRIC REDSHIFTS; NUMBER DENSITY; SIZE EVOLUTION; DISTANT GALAXIES; ILLUSTRIS SIMULATION;

D O I：

10.1093/mnras/stx1238

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use a large sample of similar to 350 000 galaxies constructed by combining the UKIDSS UDS, VIDEO/CFHT-LS, UltraVISTA/COSMOS and GAMA survey regions to probe the major (1: 4 stellar mass ratio) merging histories of massive galaxies (> 10(10)M(circle dot)) at 0.005 < z < 3.5. We use a method adapted from that presented in Lopez-Sanjuan et al., using the full photometric redshift probability distributions, tomeasure pair fractions of flux-limited, stellarmass selected galaxy samples using close-pair statistics. The pair fraction is found to weakly evolve as. (1 + z)(0.8) with no dependence on stellar mass. We subsequently derive major merger rates for galaxies at > 10(10) M-circle dot and at a constant number density of n > 10(-4) Mpc(-3), and find rates a factor of 2-3 smaller than previous works, although this depends strongly on the assumed merger time-scale and likelihood of a close-pair merging. Galaxies undergo approximately 0.5 major mergers at z < 3.5, accruing an additional (1-4) x 10(10) M-circle dot in the process. On average, this represents an increase in stellar mass of 20-30 per cent (40-70 per cent) for constant stellar mass (constant number density) samples. Major merger accretion rate densities of similar to 2 x 10(-4) M-circle dot yr(-1) Mpc(-3) are found for number density selected samples, indicating that direct progenitors of local massive (> 10(11)M(circle dot)) galaxies have experienced a steady supply of stellar mass via major mergers throughout their evolution. While pair fractions are found to agree with those predicted by the Henriques et al. semi-analytic model, the Illustris hydrodynamical simulation fails to quantitatively reproduce derived merger rates. Furthermore, we find that major mergers become a comparable source of stellar mass growth compared to star formation at z < 1, but is 10-100 times smaller than the star formation rate density at higher redshifts.

引用

页码：3507 / 3531

页数：25

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A consistent measure of the merger histories of massive galaxies using close-pair statistics - I. Major mergers at z &lt; 3.5

A consistent measure of the merger histories of massive galaxies using close-pair statistics - I. Major mergers at z < 3.5