TY - JOUR
T1 - The Pair Fraction of Massive Galaxies at 0 = z = 3
AU - Man, A.W.S.
AU - Toft, Sune
AU - Zirm, Andrew Wasmuth
AU - Wuyts, S.
AU - van der Wel, A.
PY - 2012/1/10
Y1 - 2012/1/10
N2 - Using a mass-selected (M ⊙ ≥ 1011 M ⊙) sample of 198 galaxies at 0 ≤ z ≤ 3.0 with Hubble Space Telescope/NICMOS H 160-band images from the COSMOS survey, we find evidence for the evolution of the pair fraction above z ∼ 2, an epoch in which massive galaxies are believed to undergo significant structural and mass evolution. We observe that the pair fraction of massive galaxies is 0.15 ± 0.08 at 1.7 ≤z ≤ 3.0, where galaxy pairs are defined as massive galaxies having a companion of flux ratio from 1:1 to 1:4 within a projected separation of 30 kpc. This is slightly lower but still consistent with the pair fraction measured previously in other studies, and the merger fraction predicted in halo-occupation modeling. The redshift evolution of the pair fraction is described by a power law F(z) = (0.07 ± 0.04) × (1 + z) 0.6 ± 0.5. The merger rate is consistent with no redshift evolution; however it is difficult to constrain due to the limited sample size and the high uncertainties in the merging timescale. Based on the merger rate calculation, we estimate that a massive galaxy undergoes on average 1.1 ± 0.5 major mergers from z = 3 to 0. The observed merger fraction is sufficient to explain the number density evolution of massive galaxies, but insufficient to explain the size evolution. This is a hint that mechanism(s) other than major merging may be required to increase the sizes of the massive, compact quiescent galaxies from z 2 to 0.
AB - Using a mass-selected (M ⊙ ≥ 1011 M ⊙) sample of 198 galaxies at 0 ≤ z ≤ 3.0 with Hubble Space Telescope/NICMOS H 160-band images from the COSMOS survey, we find evidence for the evolution of the pair fraction above z ∼ 2, an epoch in which massive galaxies are believed to undergo significant structural and mass evolution. We observe that the pair fraction of massive galaxies is 0.15 ± 0.08 at 1.7 ≤z ≤ 3.0, where galaxy pairs are defined as massive galaxies having a companion of flux ratio from 1:1 to 1:4 within a projected separation of 30 kpc. This is slightly lower but still consistent with the pair fraction measured previously in other studies, and the merger fraction predicted in halo-occupation modeling. The redshift evolution of the pair fraction is described by a power law F(z) = (0.07 ± 0.04) × (1 + z) 0.6 ± 0.5. The merger rate is consistent with no redshift evolution; however it is difficult to constrain due to the limited sample size and the high uncertainties in the merging timescale. Based on the merger rate calculation, we estimate that a massive galaxy undergoes on average 1.1 ± 0.5 major mergers from z = 3 to 0. The observed merger fraction is sufficient to explain the number density evolution of massive galaxies, but insufficient to explain the size evolution. This is a hint that mechanism(s) other than major merging may be required to increase the sizes of the massive, compact quiescent galaxies from z 2 to 0.
U2 - 10.1088/0004-637X/744/2/85
DO - 10.1088/0004-637X/744/2/85
M3 - Journal article
SN - 0004-637X
VL - 744
SP - 85
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
ER -