Open AccessUnderstanding the PSC z galaxy power spectrum with N ‐body simulations
Author(s) -
Neyrinck Mark C.,
Hamilton Andrew J. S.,
Gnedin Nickolay Y.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07332.x
Subject(s) - physics , astrophysics , galaxy , spectral density , dark matter , halo , redshift , galaxy formation and evolution , baryon , dark matter halo , astronomy , statistics , mathematics
By comparing the Point Source Catalogue Redshift (PSC z ) galaxy power spectrum with the results of nested pure dark matter N ‐body simulations, we try to understand how infrared‐selected galaxies populate dark matter haloes, paying special attention to the method of halo identification in the simulations. We thus test the hypothesis that baryonic physics negligibly affects the distribution of galaxies down to the smallest scales yet observed. We are successful in reproducing the PSC z power spectrum on scales ≲40 h Mpc −1 , near our resolution limit, by imposing a central density cut‐off on simulated haloes, which gives a rough minimum mass and circular velocity of haloes in which PSC z galaxies formed.