The Horizon-AGN Simulation: Morphological Diversity of Galaxies ,Promoted by AGN Feedback
Yohan Dubois,Sebastien Peirani,Sebastien Peirani,Christophe Pichon,Julien Devriendt,Raphael Gavazzi,Charlotte Welker,Charlotte Welker,Marta Volonteri +8 more
TLDR
In this paper, the critical role of active galactic nuclei (AGN) in setting up the correct galaxy morphology for the massive end of the population was identified by comparing the state-of-the-art hydrodynamical cosmological simulations Horizon-AGN and Horizon-noAGN.Abstract:
The interplay between cosmic gas accretion on to galaxies and galaxy mergers drives the observed morphological diversity of galaxies. By comparing the state-of-the-art hydrodynamical cosmological simulations Horizon-AGN and Horizon-noAGN, we unambiguously identify the critical role of active galactic nuclei (AGN) in setting up the correct galaxy morphology for the massive end of the population. With AGN feedback, typical kinematic and morpho-metric properties of galaxy populations as well as the galaxy-halo mass relation are in much better agreement with observations. Only AGN feedback allows massive galaxies at the centre of groups and clusters to become ellipticals, while without AGN feedback those galaxies reform discs. It is the merger-enhanced AGN activity that is able to freeze the morphological type of the post-merger remnant by durably quenching its quiescent star formation. Hence morphology is shown to be driven not only by mass but also by the nature of cosmic accretion: at constant galaxy mass, ellipticals are galaxies that are mainly assembled through mergers, while discs are preferentially built from the in situ star formation fed by smooth cosmic gas infall.read more
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Dwarf galaxies, cold dark matter, and biased galaxy formation
Avishai Dekel,Joseph Silk +1 more
TL;DR: In this article, a reexamination is conducted of the formation of dwarf, diffuse, metal-poor galaxies due to supernova-driven winds, in view of data on the systematic properties of dwarfs in the Local Group and Virgo Cluster.
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First results from the IllustrisTNG simulations: matter and galaxy clustering
Volker Springel,Volker Springel,Rüdiger Pakmor,Annalisa Pillepich,Rainer Weinberger,Dylan Nelson,Lars Hernquist,Mark Vogelsberger,Shy Genel,Shy Genel,Paul Torrey,Federico Marinacci,Jill Naiman +12 more
TL;DR: In this article, the authors used the IllustrisTNG simulations to study the non-linear correlation functions and power spectra of baryons, dark matter, galaxies and haloes over an exceptionally large range of scales.
Journal ArticleDOI
First results from the IllustrisTNG simulations: the galaxy colour bimodality
Dylan Nelson,Annalisa Pillepich,Volker Springel,Volker Springel,Rainer Weinberger,Lars Hernquist,Ruediger Pakmor,Shy Genel,Paul Torrey,Mark Vogelsberger,Guinevere Kauffmann,Federico Marinacci,Jill Naiman +12 more
TL;DR: The first two simulations of the IllustrisTNG project were presented in this article, focusing on the optical colors of galaxies at low redshift, and the results showed that the simulated (g-r) colors of 10^9 10^11 Msun which redden at z < 1 accumulate on average ~25% of their final z=0 mass post-reddening; at the same time, ~18% of such massive galaxies acquire half or more of their last stellar mass while on the red sequence.
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UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
TL;DR: Giacconi Fellowship from the Space Telescope Science Institute; NASA through a Hubble Fellowship grant from NASA's HST-HF2-51353.001-A; NASANational Aeronautics & Space Administration (NAS5-26555); NSFNational Science Foundation (NSF) [1066293]; National Science Foundation(NSF)'s National Research Foundation (NRF) [PHY11-25915]; Munich Institute for Astro-and Particle Physics (MIAPP) of the DFG cluster of excellence 'Origin and Structure of the Universe'
Journal ArticleDOI
Simulating galaxy formation with black hole driven thermal and kinetic feedback
Rainer Weinberger,Volker Springel,Volker Springel,Lars Hernquist,Annalisa Pillepich,Annalisa Pillepich,Federico Marinacci,Rüdiger Pakmor,Dylan Nelson,Shy Genel,Mark Vogelsberger,Jill Naiman,Paul Torrey,Paul Torrey +13 more
TL;DR: In this article, the authors explore a new model for the accretion and feedback effects of supermassive black holes, and find that a large fraction of the injected kinetic energy in this mode thermalizes via shocks in the surrounding gas, thereby providing a distributed heating channel.
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