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nIFTy cosmology: the clustering consistency of galaxy formation models

Pujol, A and Skibba, RA and Gaztanaga, E and Benson, A and Blaizot, J and Bower, R and Carretero, J and Castander, FJ and Cattaneo, A and Cora, SA and Croton, DJ and Cui, W and Cunnama, D and De Lucia, G and Devriendt, JE and Elahi, PJ and Font, AS and Fontanot, F and Garcia-Bellido, J and Gargiulo, ID and Gonzalez-Perez, V and Helly, J and Henriques, BMB and Hirschmann, M and Knebe, A and Lee, J and Mamon, GA and Monaco, P and Onions, J and Padilla, ND and Pearce, FR and Power, C and Somerville, RS and Srisawat, C and Thomas, PA and Tollet, E and 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

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Abstract

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: 30 Oct 2017 10:05
DOI or Identification number: 10.1093/mnras/stx913
URI: http://researchonline.ljmu.ac.uk/id/eprint/7429

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