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Understanding the nature of luminous red galaxies (LRGs): Connecting LRGs to central and satellite subhalos | | Shogo Masaki
; Chiaki Hikage
; Masahiro Takada
; David N. Spergel
; Naoshi Sugiyama
; | | Date: |
29 Nov 2012 | | Abstract: | We develop a novel abundance matching method to construct a mock catalog of
luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS), using
catalogs of halos and subhalos in N-body simulations for a Lambda-dominated,
cold dark matter model. Motivated by observations suggesting that LRGs are
passively-evolving, massive early-type galaxies with a typical age >5Gyr, we
assume that simulated halos at z=2 (z2-halo) are progenitors for LRG-host
subhalos observed today, we label the most tightly bound particles in each
progenitor z2-halo as LRG "stars". We then identify the subhalos containing
these stars to z=0.3 (SDSS redshift) in descending order of the masses of
z2-halos until the comoving number density of the matched subhalos becomes
comparable to the measured number density of SDSS LRGs, n_LRG=10^{-4}
(h/Mpc)^3. Our only free parameter is the number density of halos identified at
z=2 and this parameter is fixed to match the observed number density at z =
0.3. By tracing subsequent merging and assembly histories of each progenitor
z2-halo, we can directly compute, from $N$-body simulations, the distributions
of central and satellite LRGs and their internal motions in each host halo at
z=0.3. While the SDSS LRGs are galaxies selected by the magnitude and color
cuts from the SDSS images and are not necessarily a stellar-mass-selected
sample, our mock catalog reproduces a host of SDSS measurements: the halo
occupation distribution for central and satellite LRGs, the projected
auto-correlation function of LRGs, the cross-correlation of LRGs with shapes of
background galaxies (LRG-galaxy weak lensing), and the nonlinear redshift-space
distortion effect, the Finger-of-God effect, in the angle-averaged,
redshift-space power spectrum. | | Source: | arXiv, 1211.7077 | | Services: | Forum | Review | PDF | Favorites | |
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