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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 present a comprehensive analysis of galaxy close-pair fractions and major merger rates to evaluate the importance of mergers in the hierarchical growth of galaxies over cosmic time. This study focuses on the previously poorly understood…

We measure the merger fraction of massive galaxies using the UltraVISTA/COSMOS $Ks$-band selected catalog, complemented with the deeper, higher resolution 3DHST+CANDELS catalog selected in the HST/WFC3 $H$-band, presenting the largest…

Astrophysics of Galaxies · Physics 2016-11-09 Allison W. S. Man , Andrew W. Zirm , Sune Toft

Using mass-selected galaxy samples from deep multiwavelength data we investigate the incidence of close galaxy pairs between z=0.4-2. Many such close pairs will eventually merge, and the pair fraction is therefore related to the merger…

Astrophysics of Galaxies · Physics 2011-08-29 Rik J. Williams , Ryan F. Quadri , Marijn Franx

We present an analysis of the galaxy merger rate in the redshift range $4.0<z<9.0$ (i.e. about 1.5 to 0.5 Gyr after the Big Bang) based on visually identified galaxy mergers from morphological parameter analysis. Our dataset is based on…

This paper presents direct evidence for hierarchical galaxy assembly out to redshifts z ~ 3. We identify major mergers using the model-independent CAS (concentration, asymmetry, clumpiness) physical morphological system on galaxies…

Using deep infrared observations conducted with the CISCO imager on the Subaru Telescope, we investigate the field-corrected pair fraction and the implied merger rate of galaxies in redshift survey fields with Hubble Space Telescope…

We present results of a statistical study of the cosmic evolution of the mass dependent major-merger rate since z=1. A stellar mass limited sample of close major-merger pairs (the CPAIR sample) was selected from the archive of the COSMOS…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 C. Kevin Xu , Yinghe Zhao , N. Scoville , P. Capak , N. Drory , Y. Gao

Precise tracking of the growth in galaxy size and the evolution of merger fractions with redshift is vital for understanding the formation history of submillimeter galaxies (SMGs). This study investigates these evolutions over a broad…

Astrophysics of Galaxies · Physics 2025-02-24 Jian Ren , F. S. Liu , Nan Li , Pinsong Zhao , Qifan Cui , Qi Song , Yubin Li , Hao Mo , Hassen M. Yesuf , Weichen Wang , Fangxia An , Xian Zhong Zheng

We compare mass-selected close pairs at z > 1 with the intrinsic galaxy merger rate in the Illustris Simulations. To do so, we construct three 140 arcmin^2 lightcone catalogs and measure pair fractions, finding that they change little or…

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 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 investigate the evolution of the galaxy merger rate predicted by two semi-analytical galaxy formation models implemented on the Millennium Simulation of dark matter structure growth. The fraction of merging galaxy pairs at each time-step…

Astrophysics · Physics 2008-02-21 Abilio Mateus

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 use the HiZELS narrow-band H-alpha survey in combination with CANDELS, UKIDSS and WIRDS near-infrared imaging, to investigate the morphologies, merger rates and sizes of a sample of H-alpha emitting galaxies in the redshift range z=0.40…

Cosmology and Nongalactic Astrophysics · Physics 2013-09-02 John P. Stott , David Sobral , Ian Smail , Richard Bower , Philip N. Best , James E. Geach

It is still a challenge to assess the merger fraction of galaxies at different cosmic epochs in order to probe the evolution of their mass assembly. Using the Illustris cosmological simulations, we investigate the relation between the…

Astrophysics of Galaxies · Physics 2019-10-30 E. Ventou , T. Contini , N. Bouché , B. Epinat , J. Brinchmann , H. Inami , J. Richard , I. Schroetter , G. Soucail , M. Steinmetz , P. Weilbacher

(Abridged) We measure the fraction of galaxies undergoing disk-disk major mergers (f_m) at intermediate redshifts (0.35 <= z < 0.85) by studying the asymmetry index A of galaxy images. Results are provided for B- and Ks-band absolute…

Cosmology and Nongalactic Astrophysics · Physics 2012-11-14 C. López-Sanjuan , M. Balcells , C. E. García-Dabó , M. Prieto , D. Cristóbal-Hornillos , M. C. Eliche-Moral , D. Abreu , P. Erwin , R. Guzmán
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