Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

nIFTy Cosmology: Comparison of Galaxy Formation Models

Knebe, A, Pearce, FR, Thomas, PA, Benson, A, Blaizot, J, Bower, RG, Carretero, J, Castander, FJ, Cattaneo, A, Cora, SA, Croton, DJ, Cui, W, Cunnama, D, De Lucia, G, Devriendt, J, Elahi, PJ, Font, AS, Fontanot, F, Garcia-Bellido, J, Gargiulo, ID , Gonzalez-Perez, V, Helly, J, Henriques, B, Hirschmann, M, Lee, J, Mamon, GA, Monaco, P, Onions, J, Padilla, ND, Power, C, Pujol, A, Skibba, RA, Somerville, RS, Srisawat, C, Vega-Martinez, CA and Yi, SK (2015) nIFTy Cosmology: Comparison of Galaxy Formation Models. Monthly Notices of the Royal Astronomical Society, 451 (4). pp. 4029-4059. ISSN 0035-8711

knebe_nifty.pdf - Accepted Version

Download (1MB) | Preview


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 is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (August 21, 2015) 451 (4): 4029-4059 is available online at:http://dx.doi.org/10.1093/mnras/stv1149
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 30 Jun 2015 12:38
Last Modified: 09 Mar 2022 09:35
DOI or ID number: http://mnras.oxfordjournals.org/
URI: https://researchonline.ljmu.ac.uk/id/eprint/1468
View Item View Item