Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

nIFTy cosmology: the clustering consistency of galaxy formation models

Pujol, A, Skibba, RA, Gaztanaga, E, Benson, A, Blaizot, J, Bower, R, Carretero, J, Castander, FJ, Cattaneo, A, Cora, SA, Croton, DJ, Cui, W, Cunnama, D, De Lucia, G, Devriendt, JE, Elahi, PJ, Font, AS, Fontanot, F, Garcia-Bellido, J, Gargiulo, ID , Gonzalez-Perez, V, Helly, J, Henriques, BMB, Hirschmann, M, Knebe, A, Lee, J, Mamon, GA, Monaco, P, Onions, J, Padilla, ND, Pearce, FR, Power, C, Somerville, RS, Srisawat, C, Thomas, PA, Tollet, E, Vega-Martinez, CA and Yi, SK (2017) nIFTy cosmology: the clustering consistency of galaxy formation models. Monthly Notices of the Royal Astronomical Society, 469 (1). pp. 749-762. ISSN 0035-8711

nIFTy cosmology the clustering consistency of galaxy formation models.pdf - Published Version

Download (1MB) | Preview


We present a clustering comparison of 12 galaxy formation models [including semi-analytic models (SAMs) and halo occupation distribution (HOD) models] all run on halo catalogues and merger trees extracted from a single Λ cold dark matter N-body simulation. We compare the results of the measurements of the mean halo occupation numbers, the radial distribution of galaxies in haloes and the two-point correlation functions (2PCF). We also study the implications of the different treatments of orphan (galaxies not assigned to any dark matter subhalo) and non-orphan galaxies in these measurements. Our main result is that the galaxy formation models generally agree in their clustering predictions but they disagree significantly between HOD and SAMs for the orphan satellites. Although there is a very good agreement between the models on the 2PCF of central galaxies, the scatter between the models when orphan satellites are included can be larger than a factor of 2 for scales smaller than 1 h−1 Mpc. We also show that galaxy formation models that do not include orphan satellite galaxies have a significantly lower 2PCF on small scales, consistent with previous studies. Finally, we show that the 2PCF of orphan satellites is remarkably different between SAMs and HOD models. Orphan satellites in SAMs present a higher clustering than in HOD models because they tend to occupy more massive haloes. We conclude that orphan satellites have an important role on galaxy clustering and they are the main cause of the differences in the clustering between HOD models and SAMs.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 30 Oct 2017 10:05
Last Modified: 04 Sep 2021 11:03
DOI or ID number: 10.1093/mnras/stx913
URI: https://researchonline.ljmu.ac.uk/id/eprint/7429
View Item View Item