SEMI-ANALYTIC GALAXY EVOLUTION (SAGE): MODEL CALIBRATION AND BASIC RESULTS

By Darren Croton, A. Stevens, C. Tonini, T. Garel, M. Bernyk, Antonio Bibiano, Luke Hodkinson, Simon J. Mutch, Gregory B. Poole, Genevieve M. Shattow. 2016

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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.

Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Instrumentation

View Paper: https://www.semanticscholar.org/paper/b44449ab84214bac14568222558158cb1a50eb18

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Citations in the corpus

Simulating galaxy formation with the IllustrisTNG model (2017, background): “…Vogelsberger & Angulo 2012; Kim et al. 2014; Skillman et al. 2014) and coupled with ever-more comprehensive semi-analytical models for galaxy formation (from Kauffmann, White & Guiderdoni 1993; Springel et al. 2001 to Benson 2012; Henriques et al. 2015; Lacey et al. 2016; Croton et al. 2016).”
First results from the IllustrisTNG simulations: matter and galaxy clustering (2017, background): “…matching a large variety of observational data, both at the present epoch and at high redshift (e.g. Kauffmann, White & Guiderdoni 1993; De Lucia et al. 2006; Somerville et al. 2008; Benson 2012; Clay et al. 2015; Henriques et al. 2015; Croton et al. 2016; Lacey et al. 2016; Cattaneo et al. 2017).”