nIFTy cosmology: comparison of galaxy formation models

Knebe, Alexander and Pearce, Frazer R. and Thomas, Peter A. and Benson, Andrew and Blaizot, Jeremy and Bower, Richard and Carretero, Jorge and Castander, Francisco J. and Cattaneo, Andrea and Cora, Sofia A. and Croton, Darren J. and Cui, Weiguang and Cunnama, Daniel and De Lucia, Gabriella and Devriendt, Julien E. and Elahi, Pascal Jahan and Font, Andreea and Fontanot, Fabio and Garcia-Bellido, Juan and Gargiulo, Ignacio D. and Gonzalez-Perez, Violeta and Helly, John and Henriques, Bruno and Hirschmann, Michaela and Lee, Jaehyun and Mamon, Gary A. and Monaco, Pierluigi and Onions, Julian and Padilla, Nelson D. and Power, Chris and Pujol, Arnau and Skibba, R.A. and Somerville, Rachel S. and Srisawat, Chaichalit and Vega-Martínez, Cristian A. and Yi, Sukyoung K. (2015) nIFTy cosmology: comparison of galaxy formation models. Monthly Notices of the Royal Astronomical Society, 451 (4). pp. 4029-4059. ISSN 1365-2966

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Abstract

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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: methods: analytical – methods: numerical – galaxies: evolution – galaxies: haloes – cosmology: theory – dark matter
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1093/mnras/stv1149
Depositing User: Eprints, Support
Date Deposited: 04 May 2017 09:48
Last Modified: 04 May 2017 22:23
URI: http://eprints.nottingham.ac.uk/id/eprint/42493

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