Modelling galaxy clustering: Halo occupation distribution versus subhalo matching

Hong Guo, Zheng Zheng, Peter S. Behroozi, Idit Zehavi, Chia Hsun Chuang, Johan Comparat, Ginevra Favole, Stefan Gottloeber, Anatoly Klypin, Francisco Prada, Sergio A. Rodríguez-Torres, David H. Weinberg, Gustavo Yepes

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


We model the luminosity-dependent projected and redshift-space two-point correlation functions (2PCFs) of the Sloan Digital Sky Survey (SDSS) Data Release 7 Main galaxy sample, using the halo occupation distribution (HOD) model and the subhalo abundance matching (SHAM) model and its extension. All the models are built on the same high-resolution N-body simulations. We find that the HOD model generally provides the best performance in reproducing the clustering measurements in both projected and redshift spaces. The SHAM model with the same halo-galaxy relation for central and satellite galaxies (or distinct haloes and subhaloes), when including scatters, has a best-fitting χ2/dof around 2-3. We therefore extend the SHAM model to the subhalo clustering and abundance matching (SCAM) by allowing the central and satellite galaxies to have different galaxy-halo relations. We infer the corresponding halo/subhalo parameters by jointly fitting the galaxy 2PCFs and abundances and consider subhaloes selected based on three properties, the mass Macc at the time of accretion, the maximum circular velocity Vacc at the time of accretion, and the peak maximum circular velocity Vpeak over the history of the subhaloes. The three subhalo models work well for luminous galaxy samples (with luminosity above L*). For low-luminosity samples, the Vacc model stands out in reproducing the data, with the Vpeak model slightly worse, while the Macc model fails to fit the data. We discuss the implications of the modelling results.

Original languageEnglish (US)
Pages (from-to)3040-3058
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Jul 1 2016
Externally publishedYes


  • Cosmology: observations
  • Cosmology: theory
  • Galaxies: distances and redshifts
  • Galaxies: haloes
  • Galaxies: statistics
  • Large-scale structure of Universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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