Physical Models of Galaxy Formation in a Cosmological Framework
Rachel S. Somerville,Romeel Davé +1 more
TLDR
In this article, the authors review the current status of models that employ semi-analytic models and numerical hydrodynamic simulations to simulate the physics of galaxy formation and show remarkable convergence between different methods and make predictions that are in qualitative agreement with observations.Abstract:
Modeling galaxy formation in a cosmological context presents one of the greatest challenges in astrophysics today, due to the vast range of scales and numerous physical processes involved. Here we review the current status of models that employ two leading techniques to simulate the physics of galaxy formation: semi-analytic models and numerical hydrodynamic simulations. We focus on a set of observational targets that describe the evolution of the global and structural properties of galaxies from roughly Cosmic High Noon ($z\sim 2-3$) to the present. Although minor discrepancies remain, overall, models show remarkable convergence between different methods and make predictions that are in qualitative agreement with observations. Modelers seem to have converged on a core set of physical processes that are critical for shaping galaxy properties. This core set includes cosmological accretion, strong stellar-driven winds that are more efficient at low masses, black hole feedback that preferentially suppresses star formation at high masses, and structural and morphological evolution through merging and environmental processes. However, all cosmological models currently adopt phenomenological implementations of many of these core processes, which must be tuned to observations. Many details of how these diverse processes interact within a hierarchical structure formation setting remain poorly understood. Emerging multi-scale simulations are helping to bridge the gap between stellar and cosmological scales, placing models on a firmer, more physically grounded footing. Concurrently, upcoming telescope facilities will provide new challenges and constraints for models, particularly by directly constraining inflows and outflows through observations of gas in and around galaxies.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.
Journal ArticleDOI
Simulating galaxy formation with the IllustrisTNG model
Annalisa Pillepich,Annalisa Pillepich,Volker Springel,Volker Springel,Dylan Nelson,Shy Genel,Shy Genel,Jill Naiman,Rüdiger Pakmor,Lars Hernquist,Paul Torrey,Mark Vogelsberger,Rainer Weinberger,Federico Marinacci +13 more
TL;DR: In this article, an updated physical model to simulate the formation and evolution of galaxies in cosmological, large-scale gravity+magnetohydrodynamical simulations with the moving mesh code AREPO is introduced.
Journal ArticleDOI
The Circumgalactic Medium
TL;DR: The circumgalactic medium (CGM) as mentioned in this paper is a multiphase medium characterized by rich dynamics and complex ionization states, and it is a source for a galaxy's star-forming fuel, the venue for galactic feedback and recycling, and perhaps the key regulator of the galactic gas supply.
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.
Journal ArticleDOI
SIMBA: Cosmological simulations with black hole growth and feedback
Romeel Davé,Romeel Davé,Daniel Anglés-Alcázar,Desika Narayanan,Desika Narayanan,Qi Li,Mika Rafieferantsoa,Sarah Appleby +7 more
TL;DR: Simba as discussed by the authors is the next generation of the Mufasa cosmological galaxy formation simulations run with Gizmo's meshless finite mass hydrodynamics, which includes updates to Mufaa's sub-resolution star formation and feedback prescriptions, and introduces black hole growth via the torque-limited accretion model of Angles-Alcazar et al.
References
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TL;DR: In this paper, the authors present the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra, which are extremely well described by the standard spatially-flat six-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations.
Book
Computer simulation using particles
R W Hockney,J W Eastwood +1 more
TL;DR: In this paper, a simulation program for particle-mesh force calculation is presented, based on a one-dimensional plasma model and a collisionless particle model, which is used to simulate collisionless particle models.
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The Cosmological simulation code GADGET-2
TL;DR: GADGET-2 as mentioned in this paper is a massively parallel tree-SPH code, capable of following a collisionless fluid with the N-body method, and an ideal gas by means of smoothed particle hydrodynamics.
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Nine-year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
Gary Hinshaw,Davin Larson,Eiichiro Komatsu,David N. Spergel,David N. Spergel,Charles L. Bennett,Joanna Dunkley,Michael R. Nolta,Mark Halpern,Robert S. Hill,N. Odegard,Lyman A. Page,Kendrick M. Smith,Kendrick M. Smith,Janet L. Weiland,B. Gold,N. Jarosik,Alan J. Kogut,Michele Limon,S. S. Meyer,Gregory S. Tucker,Edward J. Wollack,Edward L. Wright +22 more
TL;DR: In this paper, the authors present cosmological parameter constraints based on the final nine-year WMAP data, in conjunction with a number of additional cosmology data sets.