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Extragalactic starbursts induced by gravitational interactions can now be studied from z = ~0 to ~2. The evidence that mergers of gas-rich galaxies tend to trigger galaxy-wide starbursts is strong, both statistically and in individual cases…

Astrophysics · Physics 2015-11-11 Francois Schweizer

Starburst (SB) galaxies are a rare population of galaxies with star formation rates (SFRs) greatly exceeding those of the majority of star-forming galaxies with similar stellar mass. It is unclear whether these bursts are the result of…

Astrophysics of Galaxies · Physics 2023-09-19 Elia Cenci , Robert Feldmann , Jindra Gensior , Jorge Moreno , Luigi Bassini , Mauro Bernardini

The correspondence between galaxy major mergers and starburst activity is well-established observationally and in simulations of low redshift galaxies. However, the evolution of the properties of interactions and of the galaxies involved…

Astrophysics of Galaxies · Physics 2022-09-21 Florent Renaud , Álvaro Segovia Otero , Oscar Agertz

Galaxy interactions and mergers play a significant, but still debated and poorly understood role in the star formation history of galaxies. Numerical and theoretical models cannot yet explain the main properties of merger-induced…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Frederic Bournaud , Leila C. Powell , Damien Chapon , Romain Teyssier

We study the shape and evolution of the star formation main sequence in three independently developed semi-analytic models of galaxy formation. We focus, in particular, on the characterization of the model galaxies that are significantly…

Astrophysics of Galaxies · Physics 2019-03-15 Lan Wang , Gabriella De Lucia , Fabio Fontanot , Michaela Hirschmann

The most active starbursts are found in galaxies with the highest IR luminosities, with peak star formation rates and efficiencies that are over an order of magnitude higher than in normal disk systems. These systems are almost exclusively…

Astrophysics · Physics 2009-10-30 J. E. Hibbard

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

We investigate the fraction of close pairs and morphologically identified mergers on and above the star-forming main sequence (MS) at 0.2$\leq z\leq$2.0. The novelty of our work lies in the use of a non-parametric morphological…

Interactions and mergers play an important role in regulating the physical properties of galaxies, such as their morphology, gas content, and star formation rate (SFR). Controversy exists as to the degree to which these events, even…

Astrophysics of Galaxies · Physics 2023-08-16 Yang A. Li , Luis C. Ho , Jinyi Shangguan

Both observations and simulations show that major tidal interactions or mergers between gas-rich galaxies can lead to intense bursts of starformation. Yet, the average enhancement in star formation rate (SFR) in major mergers and the…

We use numerical simulation to investigate the triggering of starbursts in merging disk galaxies. The properties of the merger-driven starbursts are sensitive to the structure of the progenitor galaxies; specifically, to the amount of…

Astrophysics · Physics 2007-05-23 Chris Mihos , Lars Hernquist

Simulations and observations suggest that galaxy interactions may enhance the star formation rate (SFR) in merging galaxies. One proposed mechanism is the torque exerted on the gas and stars in the larger galaxy by the smaller galaxy. We…

We numerically investigate stellar and gaseous dynamical evolution of mergers between five identical late-type disk galaxies with the special emphasis on star formation history and chemical evolution of multiple galaxy mergers. We found…

Astrophysics · Physics 2009-10-31 Kenji Bekki

Galaxy mergers and interactions are an integral part of our basic understanding of how galaxies grow and evolve over time. However, the effect that galaxy mergers have on star formation rates (SFR) is contested, with observations of galaxy…

We investigate the influence of interactions on the star formation by studying a sample of almost 1500 of the nearest galaxies, all within a distance of ~45 Mpc. We define the massive star formation rate (SFR), as measured from far-IR…

Astrophysics of Galaxies · Physics 2015-10-14 Johan H. Knapen , Mauricio Cisternas , Miguel Querejeta

Galaxy mergers are believed to trigger strong starbursts. This is well assessed by observations in the local Universe. However the efficiency of this mechanism has poorly been tested so far for high redshift, actively star forming,…

There is a consensus in the literature that starburst galaxies are triggered by inter- action events. However, it remains an open question as to what extent both merging and non-merging interactions have in triggering starbursts? In this…

Astrophysics of Galaxies · Physics 2018-06-13 C. L. Wilkinson , K. A. Pimbblet , J. P. Stott , C. G. Few , B. K. Gibson

We present hydrodynamic simulations of a major merger of disk galaxies, and study the ISM dynamics and star formation properties. High spatial and mass resolutions of 12pc and 4x10^4 M_sol allow to resolve cold and turbulent gas clouds…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Romain Teyssier , Damien Chapon , Frederic Bournaud

We investigate the environments and clustering properties of starburst galaxies selected from the 2dF Galaxy Redshift Survey (2dFGRS) in order to determine which, if any, environmental factors play a role in triggering a starburst. We…

Astrophysics · Physics 2009-11-13 Matt Owers , Chris Blake , Warrick Couch , Mike Pracy , Kenji Bekki

An increasing amount of observational evidence supports the notion that there are two modes of star formation: a quiescent mode in disk-like galaxies, and a starburst mode, which is generally interpreted as driven by merging. Using a…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Alessandra Lamastra , Nicola Menci , Fabrizio Fiore , Paola Santini
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