Interacting galaxies in the IllustrisTNG simulations – II: star formation in the post-merger stage
@article{Hani2020InteractingGI, title={Interacting galaxies in the IllustrisTNG simulations – II: star formation in the post-merger stage}, author={Maan H Hani and Hayman Gosain and Sara L. Ellison and David R Patton and Paul Torrey}, journal={Monthly Notices of the Royal Astronomical Society}, year={2020} }
Galaxy mergers are a major evolutionary transformation whose effects are borne out by a plethora of observations and numerical simulations. However, most previous simulations have used idealized, isolated, binary mergers and there has not been significant progress on studying statistical samples of galaxy mergers in large cosmological simulations. We present a sample of 27 691 post-merger (PM) galaxies (0c ≤ z ≤ 1) identified from IllustrisTNG: a cosmological, large box, magnetohydrodynamical…
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References
SHOWING 1-10 OF 104 REFERENCES
Galaxy pairs in the Sloan Digital Sky Survey – VIII. The observational properties of post-merger galaxies
- Physics
- 2013
In order to investigate the effects of galaxy mergers throughout the interaction sequence, we present a study of 10,800 galaxies in close pairs and a smaller sample of 97 post-mergers identified in…
The merger rate of galaxies in the Illustris simulation: a comparison with observations and semi-empirical models
- Physics
- 2015
We have constructed merger trees for galaxies in the Illustris simulation by directly tracking the baryonic content of subhaloes. These merger trees are used to calculate the galaxy–galaxy merger…
Spatially resolved star formation and metallicity profiles in post-merger galaxies from MaNGA
- PhysicsMonthly Notices of the Royal Astronomical Society: Letters
- 2018
Large galaxy surveys have demonstrated that galaxy-galaxy mergers can dramatically change the morphologies, star formation rates (SFRs) and metallicities of their constituents. However, most…
Star formation efficiency in galaxy interactions and mergers: a statistical study
- Physics
- 2007
We investigate the enhancement of star formation efficiency in galaxy interactions and mergers by numerical simulations of several hundred galaxy collisions. All morphological types along the Hubble…
Galaxy mergers moulding the circum-galactic medium – I. The impact of a major merger
- Physics
- 2018
Galaxies are surrounded by sizeable gas reservoirs which host a significant amount of metals: the circum-galactic medium (CGM). The CGM acts as a mediator between the galaxy and the extra-galactic…
Mapping galaxy encounters in numerical simulations: the spatial extent of induced star formation
- Physics
- 2015
We employ a suite of 75 simulations of galaxies in idealized major mergers (stellar mass ratio ∼2.5:1), with a wide range of orbital parameters, to investigate the spatial extent of…
Zooming in on major mergers: dense, starbursting gas in cosmological simulations
- Physics
- 2016
We introduce the `Illustris zoom simulation project', which allows the study of selected galaxies forming in the $\Lambda$CDM cosmology with a 40 times better mass resolution than in the parent…
Galaxy merger morphologies and time-scales from simulations of equal-mass gas-rich disc mergers
- Physics
- 2008
A key obstacle to understanding the galaxy merger rate and its role in galaxy evolution is the difficulty in constraining the merger properties and time-scales from instantaneous snapshots of the…
The effect of galaxy mass ratio on merger-driven starbursts
- Physics
- 2008
We employ numerical simulations of galaxy mergers to explore the effect of galaxy mass ratio on merger-driven starbursts. Our numerical simulations include radiative cooling of gas, star formation,…
Galaxy pairs in the Sloan Digital Sky Survey – X. Does gas content alter star formation rate enhancement in galaxy interactions?
- Physics
- 2015
New spectral line observations, obtained with the Jansky Very Large Array (VLA), of a sample of 34 galaxies in 17 close pairs are presented in this paper. The sample of galaxy pairs is selected to…