Angular momentum properties of haloes and their baryon content in the Illustris simulation
TLDR
In this paper, the authors employ the Illustris simulation suite, one of the first simulations of galaxy formation with full hydrodynamics that produces a realistic galaxy population in a sizeable volume, to quantify the baryonic spin properties for more than 320,000 haloes.Abstract:
The angular momentum properties of virialised dark matter haloes have been measured with good statistics in collisionless N-body simulations, but an equally accurate analysis of the baryonic spin is still missing. We employ the Illustris simulation suite, one of the first simulations of galaxy formation with full hydrodynamics that produces a realistic galaxy population in a sizeable volume, to quantify the baryonic spin properties for more than $\sim$ 320,000 haloes. We first compare the systematic differences between different spin parameter and halo definitions, and the impact of sample selection criteria on the derived properties. We confirm that dark matter only haloes exhibit a close to self-similar spin distribution in mass and redshift of lognormal form. However, the physics of galaxy formation radically changes the baryonic spin distribution. While the dark matter component remains largely unaffected, strong trends with mass and redshift appear for the spin of diffuse gas and the formed stellar component. With time the baryons staying bound to the halo develop a misalignment of their spin vector with respect to dark matter, and increase their specific angular momentum by a factor of $\sim$ 1.3 in the non-radiative case and $\sim$ 1.8 in the full physics setup at z = 0. We show that this enhancement in baryonic spin can be explained by the combined effect of specific angular momentum transfer from dark matter onto gas during mergers and from feedback expelling low specific angular momentum gas from the halo. Our results challenge certain models for spin evolution and underline the significant changes induced by baryonic physics in the structure of haloes.read more
Citations
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The IllustrisTNG simulations: public data release
Dylan Nelson,Volker Springel,Volker Springel,Volker Springel,Annalisa Pillepich,Vicente Rodriguez-Gomez,Paul Torrey,Paul Torrey,Shy Genel,Mark Vogelsberger,Ruediger Pakmor,Ruediger Pakmor,Federico Marinacci,Federico Marinacci,Rainer Weinberger,Luke Zoltan Kelley,Mark R. Lovell,Mark R. Lovell,Benedikt Diemer,Lars Hernquist +19 more
TL;DR: The full public release of all data from the TNG100 and TNG300 simulations of the IllustrisTNG project is presented in this article, which includes a comprehensive model for galaxy formation physics, and each TNG simulation selfconsistently solves for the coupled evolution of dark matter, cosmic gas, luminous stars, and supermassive black holes from early time to the present day.
Journal ArticleDOI
The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time
Robert J. J. Grand,Robert J. J. Grand,Facundo A. Gómez,Federico Marinacci,Rüdiger Pakmor,Volker Springel,Volker Springel,David J. R. Campbell,Carlos S. Frenk,Adrian Jenkins,Simon D. M. White +10 more
TL;DR: In this article, a suite of 30 cosmological magneto-hydrodynamical zoom simulations of the formation of galaxies in isolated Milky Way mass dark haloes are presented.
Posted Content
The IllustrisTNG Simulations: Public Data Release
Dylan Nelson,Volker Springel,Volker Springel,Volker Springel,Annalisa Pillepich,Vicente Rodriguez-Gomez,Paul Torrey,Paul Torrey,Shy Genel,Mark Vogelsberger,Ruediger Pakmor,Ruediger Pakmor,Federico Marinacci,Federico Marinacci,Rainer Weinberger,Luke Zoltan Kelley,Mark R. Lovell,Mark R. Lovell,Benedikt Diemer,Lars Hernquist +19 more
TL;DR: Improvements and new functionality in the web-based API are described, including on-demand visualization and analysis of galaxies and halos, exploratory plotting of scaling relations and other relationships between galactic and halo properties, and a new JupyterLab interface that provides an online, browser-based, near-native data analysis platform enabling user computation with local access to TNG data, alleviating the need to download large datasets.
Journal ArticleDOI
The role of mergers and halo spin in shaping galaxy morphology
Vicente Rodriguez-Gomez,Vicente Rodriguez-Gomez,Laura V. Sales,Shy Genel,Shy Genel,Annalisa Pillepich,Annalisa Pillepich,Jolanta Zjupa,Jolanta Zjupa,Dylan Nelson,Brendan F. Griffen,Paul Torrey,Gregory F. Snyder,Mark Vogelsberger,Volker Springel,Volker Springel,Chung-Pei Ma,Lars Hernquist +17 more
TL;DR: In this paper, the authors consider 18,000 central galaxies with stellar masses from the Illustris cosmological hydrodynamic simulation and find that the fraction of accreted stars increases with galaxy stellar mass, from less than 5% in dwarfs to 80% in the most massive objects.
Journal ArticleDOI
Gas kinematics, morphology and angular momentum in the FIRE simulations
Kareem El-Badry,Eliot Quataert,Andrew Wetzel,Philip F. Hopkins,Daniel R. Weisz,T. K. Chan,Alex Fitts,Michael Boylan-Kolchin,Dušan Kereš,Claude André Faucher-Giguère,Shea Garrison-Kimmel +10 more
TL;DR: El-Badry et al. as mentioned in this paper studied the z = 0 gas kinematics, morphology and angular momentum content of isolated galaxies in a suite of cosmological zoom-in simulations from the FIRE project spanning Mstar = 106-11M.
References
More filters
Journal ArticleDOI
A Universal Density Profile from Hierarchical Clustering
TL;DR: In this article, the authors used high-resolution N-body simulations to study the equilibrium density profiles of dark matter halos in hierarchically clustering universes, and they found that all such profiles have the same shape, independent of the halo mass, the initial density fluctuation spectrum, and the values of the cosmological parameters.
Journal ArticleDOI
Simulations of the formation, evolution and clustering of galaxies and quasars
Volker Springel,Simon D. M. White,Adrian Jenkins,Carlos S. Frenk,Naoki Yoshida,Liang Gao,Julio F. Navarro,Robert J. Thacker,Darren J. Croton,John C. Helly,John A. Peacock,Shaun Cole,Peter A. Thomas,Hugh M. P. Couchman,August E. Evrard,Jörg M. Colberg,Frazers Pearce +16 more
TL;DR: It is shown that baryon-induced features in the initial conditions of the Universe are reflected in distorted form in the low-redshift galaxy distribution, an effect that can be used to constrain the nature of dark energy with future generations of observational surveys of galaxies.
Journal ArticleDOI
Core condensation in heavy halos: a two-stage theory for galaxy formation and clustering
Simon D. M. White,Martin J. Rees +1 more
Journal ArticleDOI
The evolution of large-scale structure in a universe dominated by cold dark matter
TL;DR: In this article, the results of numerical simulations of nonlinear gravitational clustering in universes dominated by weakly interacting, cold dark matter are presented and the evolution of the fundamental statistical properties of the models is described and their comparability with observation is discussed.
Journal ArticleDOI
The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
Joop Schaye,Robert A. Crain,Richard G. Bower,Michelle Furlong,Matthieu Schaller,Tom Theuns,Tom Theuns,Claudio Dalla Vecchia,Claudio Dalla Vecchia,Carlos S. Frenk,Ian G. McCarthy,John C. Helly,Adrian Jenkins,Yetli Rosas-Guevara,Simon D. M. White,Maarten Baes,C. M. Booth,C. M. Booth,Peter Camps,Julio F. Navarro,Yan Qu,Alireza Rahmati,Till Sawala,Peter A. Thomas,James W. Trayford +24 more
TL;DR: The Virgo Consortium's EAGLE project as discussed by the authors is a suite of hydrodynamical simulations that follow the formation of galaxies and black holes in representative volumes, where thermal energy is injected into the gas, allowing winds to develop without predetermined speed or mass loading factors.