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Collisions and interactions between gas-rich galaxies are thought to be pivotal stages in their formation and evolution, causing the rapid production of new stars, and possibly serving as a mechanism for fueling supermassive black holes…

Binary merging constitutes a complementary mode of galaxy evolution to the canonical hierarchical clustering theory. This merger-driven evolution not only influences the galaxy mass distribution function, but may drive the main galactic…

Astrophysics · Physics 2007-05-23 Yiping Wang , Peter L. Biermann

We forward model the difference in stellar age between post-coalescence mergers and a control sample with the same stellar mass, environmental density, and redshift. In particular, we use a pure sample of 445 post-coalescence mergers from…

Astrophysics of Galaxies · Physics 2023-10-19 Andrew M. M. Reeves , Michael J. Hudson

Using data from the DEEP2 Galaxy Redshift Survey and HST/ACS imaging in the Extended Groth Strip, we select nearly 100 interacting galaxy systems including kinematic close pairs and morphologically identified merging galaxies. Spitzer MIPS…

Post-starburst (PSB) galaxies are defined as having experienced a recent burst of star formation, followed by a prompt truncation in further activity. Identifying the mechanism(s) causing a galaxy to experience a post-starburst phase…

We complement a recent ApJ Letter by Luo et al. by comparing the fraction of starburst galaxies which are interacting with the overall fraction of interacting galaxies in the nearby galaxy population (within 40 Mpc). We confirm that in…

Astrophysics of Galaxies · Physics 2015-06-03 Johan H. Knapen , Mauricio Cisternas

The process of galaxy evolution over cosmic time is not yet fully understood, since there is a debate on the impact of galaxy collisions on the star formation and metallicity. The local environment of the galaxy mergers could also have a…

Astrophysics of Galaxies · Physics 2025-09-12 Bendeguz Koncz , Istvan Horvath , András Péter Joó , Andreas Burkert , L. Viktor Tóth

It has been known since many decades that galaxy interactions can induce star formation (hereafter SF) enhancements and that one of the driving mechanisms of this enhancement is related to gas inflows into the central galaxy regions,…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 P. Di Matteo , M. Montuori , M. D. Lehnert , F. Combes , B. Semelin

Galaxy interaction and merging have clear effects on the systems involved. We find an increase in the star formation rate (SFR), potential ignition of active galactic nuclei (AGN) and significant morphology changes. However, at what stage…

In this review we discuss the evidence for galaxy interactions and mergers in the distant universe and the role of mergers in forming galaxies. Observations show that the fraction of massive (M> M_*) galaxies involved in major mergers is…

Astrophysics · Physics 2009-11-11 Christopher J. Conselice

Optical and X-ray studies have established the prevalence of significant substructure in clusters of galaxies, indicating that clusters are young systems, and that recent major mergers have occurred in many clusters. Numerical simulations…

Astrophysics · Physics 2007-05-23 C. Moss

A large fraction of the luminous distant submm-wave galaxies recently detected using SCUBA on the JCMT appear to be associated with interacting optical counterparts. We investigate these systems using a simple hierarchical clustering model…

Astrophysics · Physics 2009-10-31 Andrew W. Blain , Allon Jameson , Ian Smail , Malcolm Longair , Jean-Paul Kneib , Rob Ivison

Recent simulation work has successfully captured the formation of the star clusters that have been observed in merging galaxies. These studies, however, tend to focus on studying extreme starbursts, such as the Antennae galaxies. We aim to…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-16 Leila C. Powell , Frederic Bournaud , Damien Chapon , Romain Teyssier

Major mergers of galaxies are likely to trigger bursty star formation activities. The accumulation of dense gas and the boost of star formation efficiency (SFE) are considered to be the two main drivers of starbursts. However, it remains…

Astrophysics of Galaxies · Physics 2026-01-14 Yunwei Deng , Hui Li , Federico Marinacci , Yang Ni , Boyuan Liu , Aaron Smith , Rahul Kannan , Greg L. Bryan

Gas-rich galaxy mergers are more easily identified by their disturbed morphologies than mergers with less gas. Because the typical gas fraction of galaxy mergers is expected to increase with redshift, the under-counting of low gas-fraction…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Jennifer M. Lotz , Patrik Jonsson , T. J. Cox , Joel R. Primack

Because the majority of massive stars are born as members of close binary systems, populations of massive main-sequence stars contain stellar mergers and products of binary mass transfer. We simulate populations of massive stars accounting…

Solar and Stellar Astrophysics · Physics 2015-06-18 S. E. de Mink , H. Sana , N. Langer , R. G. Izzard , F. R. N. Schneider

Utilizing a high-resolution (114 pc/h) adaptive mesh-refinement cosmological galaxy formation simulation of the standard cold dark matter model with a large (2000-3000 galaxies with stellar mass greater than 1e9 Msun) statistical sample, we…

Cosmology and Nongalactic Astrophysics · Physics 2011-11-04 Renyue Cen

Starbursts and substantial variations in the star formation histories are a common phenomenon in galaxies. We study the stability properties of isolated star-forming dwarf galaxies with the aim of identifying starburst modes. The impact of…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 Christian Theis , Joachim Koeppen

Two main modes of star formation are know to control the growth of galaxies: a relatively steady one in disk-like galaxies, defining a tight star formation rate (SFR)-stellar mass sequence, and a starburst mode in outliers to such a…

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