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nIFTy cosmology: the clustering consistency of galaxy formation models

Pujol, Arnau; Skibba, Ramin A.; Gazta�aga, Enrique; Benson, Andrew; Blaizot, Jeremy; Bower, Richard; Carretero, Jorge; Castander, Francisco J.; Cattaneo, Andrea; Cora, Sofia A.; Croton, Darren J.; Cui, Weiguang; Cunnama, Daniel; De Lucia, Gabriella; Devriendt, Julien E.; Elahi, Pascal J.; Font, Andreea; Fontanot, Fabio; Garcia-Bellido, Juan; Gargiulo, Ignacio D.; Gonzalez-Perez, Violeta; Helly, John; Henriques, Bruno M. B.; Hirschmann, Michaela; Knebe, Alexander; Lee, Jaehyun; Mamon, Gary A.; Monaco, Pierluigi; Onions, Julian; Padilla, Nelson D.; Pearce, Frazer R.; Power, Chris; Somerville, Rachel S.; Srisawat, Chaichalit; Thomas, Peter A.; Tollet, Edouard; Vega-Mart�nez, Cristian A.; Yi, Sukyoung K.

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Arnau Pujol

Ramin A. Skibba

Enrique Gazta�aga

Andrew Benson

Jeremy Blaizot

Richard Bower

Jorge Carretero

Francisco J. Castander

Andrea Cattaneo

Sofia A. Cora

Darren J. Croton

Weiguang Cui

Daniel Cunnama

Gabriella De Lucia

Julien E. Devriendt

Pascal J. Elahi

Andreea Font

Fabio Fontanot

Juan Garcia-Bellido

Ignacio D. Gargiulo

Violeta Gonzalez-Perez

John Helly

Bruno M. B. Henriques

Michaela Hirschmann

Alexander Knebe

Jaehyun Lee

Gary A. Mamon

Pierluigi Monaco

Julian Onions

Nelson D. Padilla

Frazer R. Pearce

Chris Power

Rachel S. Somerville

Chaichalit Srisawat

Peter A. Thomas

Edouard Tollet

Cristian A. Vega-Mart�nez

Sukyoung K. Yi


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 _ 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.

Journal Article Type Article
Acceptance Date Apr 11, 2017
Online Publication Date Apr 17, 2017
Publication Date Jul 21, 2017
Deposit Date Feb 1, 2018
Publicly Available Date Feb 1, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 469
Issue 1
Keywords methods: numerical ; galaxies: haloes ; cosmology: theory.
Public URL
Publisher URL


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