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… 
Interacting galaxies in the IllustrisTNG simulations - I: Triggered star formation in a cosmological context
We use the IllustrisTNG cosmological hydrodynamical simulations to investigate how the specific star formation rates (sSFRs) of massive galaxies (M* > 1010 M⊙) depend on the distance to their
Interacting galaxies in the IllustrisTNG simulations – III. (The rarity of) quenching in post-merger galaxies
Galaxy mergers are traditionally one of the favoured mechanisms for the transformation of spiral galaxies to spheroids and for quenching star formation. To test this paradigm in the context of modern
The impact of magnetic fields on cosmological galaxy mergers – I. Reshaping gas and stellar discs
Mergers play an important role in galaxy evolution. In particular, major mergers are able to have a transformative effect on galaxy morphology. In this paper, we investigate the role of magnetic
Galaxy pairs in the Sloan Digital Sky Survey – XIV. Galaxy mergers do not lie on the fundamental metallicity relation
In recent observational studies, star-forming galaxies have been shown to follow a relation often dubbed the fundamental metallicity relation (FMR). This relation links the stellar mass of a galaxy
The diversity and variability of star formation histories in models of galaxy evolution
Understanding the variability of galaxy star formation histories (SFHs) across a range of timescales provides insight into the underlying physical processes that regulate star formation within
One–Two Quench: A Double Minor Merger Scenario
Using the N-body+Smoothed particle hydrodynamics code, ChaNGa, we identify two merger-driven processes—disk disruption and supermassive black hole (SMBH) feedback—which work together to quench L *
The breakBRD Breakdown: Using IllustrisTNG to Track the Quenching of an Observationally Motivated Sample of Centrally Star-forming Galaxies
The observed breakBRD (“break bulges in red disks”) galaxies are a nearby sample of face-on disk galaxies with particularly centrally concentrated star formation: they have red disks but recent star
ZFIRE: The Beginning of the End for Massive Galaxies at z ∼ 2 and Why Environment Matters
We use ZFIRE and ZFOURGE observations with the spectral energy distribution fitting tool PROSPECTOR to reconstruct the star formation histories (SFHs) of protocluster and field galaxies at z ∼ 2 and
Rise and fall of post-starburst galaxies in Magneticum Pathfinder
Post-starburst (PSB) galaxies belong to a short-lived transition population between star-forming (SF) and quiescent galaxies. Deciphering their heavily discussed evolutionary pathways is paramount
Detection of Double-Nuclei Galaxies in SDSS
TLDR
A novel algorithm "Gothic" (Graph-bOosTed iterated HIll Climbing) is introduced that detects whether a given image of a galaxy has characteristic features of a DNG (ASCL entry 2707) with a maximum detection rate of 4.2% with a careful choice of the input catalog.
...
...

References

SHOWING 1-10 OF 108 REFERENCES
Galaxy pairs in the Sloan Digital Sky Survey – VIII. The observational properties of post-merger galaxies
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
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
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
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
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
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
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
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
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?
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
...
...