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nIFTy Cosmology: the clustering consistency of galaxy formation models

Research output: Contribution to journalArticlepeer-review

  • Arnau Pujol
  • Ramin A. Skibba
  • Enrique Gaztañaga
  • Andrew J. Benson
  • Jeremy Blaizot
  • Richard Bower
  • Jorge Carretero
  • Francisco Javier 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
  • And 18 others
  • Violeta Gonzalez-Perez
  • John C. Helly
  • Bruno M. 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-Martínez
  • 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 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.
Original languageEnglish
Pages (from-to)749-762
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date17 Apr 2017
Publication statusPublished - 1 Jul 2017


  • 1702.02620

    Rights statement: This is a pre-copyedited, author-produced PDF of an article accepted for publication in MNRAS following peer review. The final published version of record by Arnau Pujol et al. 'nIFTy cosmology: the clustering consistency of galaxy formation models' MNRAS (July 01, 2017) Vol. 469, 749-762 is available online at doi:10.1093/mnras/stx913.

    Accepted author manuscript (Post-print), 949 KB, PDF document

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