Physical models of galaxy formation in a cosmological framework

Rachel S. Somerville, Romeel S Dave

Research output: Contribution to journalArticle

349 Scopus citations

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: semianalytic 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 ∼ 2-3) to the present. Although minor discrepancies remain, overall, models show remarkable convergence among different methods and make predictions that are in qualitative agreement with observations. Modelers 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 multiscale 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.

Original languageEnglish (US)
Pages (from-to)51-113
Number of pages63
JournalAnnual Review of Astronomy and Astrophysics
Volume53
Issue number1
DOIs
StatePublished - Aug 18 2015
Externally publishedYes

Keywords

  • Cosmology
  • Galaxy evolution
  • Galaxy formation
  • Numerical simulations

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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