Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 451, Issue 4, Pages 4029-4059Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1149
Keywords
methods: analytical; methods: numerical; galaxies: evolution; galaxies: haloes; cosmology: theory; dark matter
Categories
Funding
- Instituto de Fisica Teorica (IFT-UAM/CSIC in Madrid) via Centro de Excelencia Severo Ochoa Program [SEV-2012-0249]
- University of Western Australia
- ARC Centre of Excellence for All Sky Astrophysics (CAASTRO) [CE110001020]
- ARC [DP130100117, DP140100198]
- Ministerio de Economia y Competitividad (MINECO) in Spain [AYA2012-31101]
- Spanish Ministerio de Ciencia e Innovacion (MICINN) [CSD2009-00064]
- Australian Research Council (ARC) [DP130100117, DP140100198]
- Science and Technology Facilities Council [ST/L000652/1]
- Spanish Ministerio de Economia y Competitividad [AYA2012-39620]
- CONICET, Argentina [PIP-220]
- QEII Fellowship from Australian Government
- UWA's Research Collaboration Award [PG12105017]
- SSimPL programme
- Sydney Institute for Astronomy (SIfA) [DP130100117]
- PRIN MIUR
- PRIN NAP
- European Research Council [DEGAS-259586, 246797, 321323]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC [ST/H008519/1]
- STFC DiRAC [ST/K003267/1]
- Durham University
- FRA of the University of Trieste
- PRIN from MIUR [J91J12000450001]
- Consorzio per la Fisica di Trieste
- BASAL [PFB-06]
- Fondecyt [1150300]
- QUIMAL [130008]
- Fondequip [AIC-57]
- Australian Research Council (ARC) through Future Fellowship [DP140100198, FT130100041]
- Generalitat de Catalunya [2009-SGR-1398]
- MICINN [AYA2012-39620]
- NSF [AST-1055081]
- Downsbrough family
- National Research Foundation of Korea [Doyak 2014003730]
- KISTI [KSC-2013-C3-015]
- STFC [ST/M007006/1, ST/K00042X/1, ST/I001212/1, ST/L00075X/1, ST/H008519/1, ST/I00162X/1, ST/L000695/1, ST/L000652/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000695/1, ST/L000652/1, ST/L00075X/1, ST/K00042X/1, ST/M007006/1, ST/I00162X/1, ST/H008519/1] Funding Source: researchfish
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We present a comparison of 14 galaxy formation models: 12 different semi-analytical models and 2 halo occupation distribution models for galaxy formation based upon the same cosmological simulation and merger tree information derived from it. The participating codes have proven to be very successful in their own right but they have all been calibrated independently using various observational data sets, stellar models, and merger trees. In this paper, we apply them without recalibration and this leads to a wide variety of predictions for the stellar mass function, specific star formation rates, stellar-to-halo mass ratios, and the abundance of orphan galaxies. The scatter is much larger than seen in previous comparison studies primarily because the codes have been used outside of their native environment within which they are well tested and calibrated. The purpose of the 'nIFTy comparison of galaxy formation models' is to bring together as many different galaxy formation modellers as possible and to investigate a common approach to model calibration. This paper provides a unified description for all participating models and presents the initial, uncalibrated comparison as a baseline for our future studies where we will develop a common calibration framework and address the extent to which that reduces the scatter in the model predictions seen here.
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