Semi-Analytic Galaxy Evolution (SAGE): Model Calibration and Basic Results

Darren J. Croton, Adam R. H. Stevens, Chiara Tonini, Thibault Garel, Maksym Bernyk, Antonio Bibiano, Luke Hodkinson, Simon J. Mutch, Gregory B. Poole, Genevieve M. Shattow

Research output: Contribution to journalArticle

135 Citations (Scopus)


This paper describes a new publicly available codebase for modeling galaxy formation in a cosmological context, the “Semi-Analytic Galaxy Evolution” model, or sage for short.5 sage is a significant update to the 2006 model of Croton et al. and has been rebuilt to be modular and customizable. The model will run on any N-body simulation whose trees are organized in a supported format and contain a minimum set of basic halo properties. In this work, we present the baryonic prescriptions implemented in sage to describe the formation and evolution of galaxies, and their calibration for three N-body simulations: Millennium, Bolshoi, and GiggleZ. Updated physics include the following: gas accretion, ejection due to feedback, and reincorporation via the galactic fountain; a new gas cooling-radio mode active galactic nucleus (AGN) heating cycle; AGN feedback in the quasar mode; a new treatment of gas in satellite galaxies; and galaxy mergers, disruption, and the build-up of intra-cluster stars. Throughout, we show the results of a common default parameterization on each simulation, with a focus on the local galaxy population....
Original languageEnglish
Article number22
JournalThe Astrophysical Journal Supplement Series
Issue number2
Publication statusPublished - Feb 2016
Externally publishedYes


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