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We present a detailed analysis of predicted galaxy-galaxy merger fractions and rates in the Millennium simulation and compare these with the most up to date observations of the same quantities up to z~3. We carry out our analysis by…

Cosmology and Nongalactic Astrophysics · Physics 2009-07-29 Serena Bertone , Christopher J. Conselice

We present a study of galaxy mergers up to $z=10$ using the Planck Millennium cosmological dark matter simulation and the {\tt GALFORM} semi-analytical model of galaxy formation. Utilising the full ($800$ Mpc)$^3$ volume of the simulation,…

Astrophysics of Galaxies · Physics 2021-12-17 Filip Huško , Cedric G. Lacey , Carlton M. Baugh

We explore the galaxy-galaxy merger rate with the empirical model for galaxy formation, Emerge. On average, we find that between $2$ per cent and $20$ per cent of massive galaxies ($\log_{10}(m_{*}/M_{\odot}) \geq 10.3$) will experience a…

Astrophysics of Galaxies · Physics 2021-01-19 Joseph A. O'Leary , Benjamin P. Moster , Thorsten Naab , Rachel S. Somerville

We estimate the evolution of the galaxy-galaxy merger fraction for $M_\star>10^{10.5}M_\odot$ galaxies over $0.25<z<1$ in the $\sim$18.6 deg$^2$ deep CLAUDS+HSC-SSP surveys. We do this by training a Random Forest Classifier to identify…

Astrophysics of Galaxies · Physics 2021-06-09 Nathalie Thibert , Marcin Sawicki , Andy Goulding , Stephane Arnouts , Jean Coupon , Stephen Gwyn

We present the quantitative rest-frame B morphological evolution and galaxy merger fractions at 0.2 < z < 1.2 as observed by the All-wavelength Extended Groth Strip International Survey (AEGIS). We use the Gini coefficent and M_20 to…

Estimates of galaxy merger rates based on counts of close pairs typically assume that most of the observed systems will merge within a few hundred Myr (for projected pair separations <25 kpc/h). Here we investigate these assumptions using…

Astrophysics · Physics 2009-11-13 Manfred G. Kitzbichler , Simon D. M. White

We explore the rate and impact of galaxy mergers on the massive galaxy population using the amplitude of the two-point correlation function on small scales for M > 5e10 M_sun galaxies from the COSMOS and COMBO-17 surveys. Using a pair…

We compare the observed merger rate of galaxies over cosmic time and the frequency of collisional ring galaxies (CRGs), with analytic models and halo merger and collision rates from a large cosmological simulation. In the Lambda cold dark…

Astrophysics · Physics 2009-11-13 E. D'Onghia , M. Mapelli , B. Moore

Using a mass-selected ($M_{\star} \ge 10^{11} M_{\odot}$) sample of 198 galaxies at 0 < z < 3.0 with HST/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…

Cosmology and Nongalactic Astrophysics · Physics 2011-12-20 Allison W. S. Man , Sune Toft , Andrew W. Zirm , Stijn Wuyts , Arjen van der Wel

HST images of a sample of 285 galaxies with measured z from the CFRS and Autofib-LDSS redshift surveys are analysed to derive the evolution of the merger fraction out to z~1. We have performed visual and machine-based merger…

We employ a high-resolution LCDM N-body simulation to present merger rate predictions for dark matter halos and investigate how common merger-related observables for galaxies--such as close pair counts, starburst counts, and the…

Astrophysics · Physics 2009-11-14 Kyle R. Stewart , James S. Bullock , Elizabeth J. Barton , Risa H. Wechsler

We use galaxy and dark halo data from the public database for the Millennium Simulation to study the growth of galaxies in the De Lucia et al. (2006) model for galaxy formation. Previous work has shown this model to reproduce many aspects…

Astrophysics · Physics 2009-11-13 Qi Guo , Simon D. M. White

We use semi-analytical modelling of galaxy formation to study the redshift evolution of the galaxy merger fractions and merger ratesin Lambda CDM and quintessence (QCDM) cosmologies, their dependence on physical parameters as the…

Astrophysics · Physics 2009-11-06 S. Khochfar , A. Burkert

In this work I investigate the redshift evolution of pair fraction of a sample of 196 massive galaxies from z = 0 to 3, selected from the COSMOS field. We find that on average a massive galaxy undergoes ~ 1.1 \pm 0.5 major merger since z =…

Cosmology and Nongalactic Astrophysics · Physics 2011-12-19 Allison W. S. Man , Andrew Zirm , Sune Toft

We present a study of the largest available sample of near-infrared selected (i.e., stellar mass selected) dynamically close pairs of galaxies at low redshifts ($z<0.3$). We combine this sample with new estimates of the major-merger pair…

Astrophysics of Galaxies · Physics 2015-06-22 R. C. Keenan , S. Foucaud , R. De Propris , B. C. Hsieh , L. Lin , R. C. Y. Chou , S. Huang , J. H. Lin , K. H. Chang

We use a combination of deep, high angular resolution imaging data from the CDFS (HST/ACS GOODS survey) and ground based near-IR $K_s$ images to derive the evolution of the galaxy major merger rate in the redshift range $0.2 \leq z \leq…

Astrophysics · Physics 2009-11-13 A. Rawat , Francois Hammer , Ajit K. Kembhavi , Hector Flores

The rate of mass accumulation due to galaxy merging depends on the mass, density, and velocity distribution of galaxies in the near neighborhood of a host galaxy. The fractional luminosity in kinematic pairs combines all of these effects in…

We study the redshift evolution of galaxy pair fractions and merger rates for different types of galaxies using kinematic pairs selected from the DEEP2 Redshift Survey. By parameterizing the evolution of the pair fraction as (1+z)^{m}, we…

Galaxy mergers are expected to have a significant role in the mass assembly of galaxies in the early Universe, but there are very few observational constraints on the merger history of galaxies at $z>2$. We present the first study of galaxy…

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