ELUCID V. Lighting dark matter halos with galaxies
Abstract
In a recent study, using the distribution of galaxies in the north galactic pole of SDSS DR7 region enclosed in a 500 box, we carried out our ELUCID simulation (Wang et al. 2016, ELUCID III). Here we {\it light} the dark matter halos and subhalos in the reconstructed region in the simulation with galaxies in the SDSS observations using a novel {\it neighborhood} abundance matching method. Before we make use of thus established galaxy-subhalo connections in the ELUCID simulation to evaluate galaxy formation models, we set out to explore the reliability of such a link. For this purpose, we focus on the following a few aspects of galaxies: (1) the central-subhalo luminosity and mass relations; (2) the satellite fraction of galaxies; (3) the conditional luminosity function (CLF) and conditional stellar mass function (CSMF) of galaxies; and (4) the cross correlation functions between galaxies and the dark matter particles, most of which are measured separately for all, red and blue galaxy populations. We find that our neighborhood abundance matching method accurately reproduces the central-subhalo relations, satellite fraction, the CLFs and CSMFs and the biases of galaxies. These features ensure that thus established galaxy-subhalo connections will be very useful in constraining galaxy formation processes. And we provide some suggestions on the three levels of using the galaxy-subhalo pairs for galaxy formation constraints. The galaxy-subhalo links and the subhalo merger trees in the SDSS DR7 region extracted from our ELUCID simulation are available upon request.
Cite
@article{arxiv.1712.00883,
title = {ELUCID V. Lighting dark matter halos with galaxies},
author = {Xiaohu Yang and Youcai Zhang and Huiyuan Wang and Chengze Liu and Tianhuan Lu and Shijie Li and Feng Shi and Y. P. Jing and H. J. Mo and Frank C. van den Bosch and Xi Kang and Weiguang Cui and Hong Guo and Guoliang Li and S. H. Lim and Yi Lu and Wentao Luo and Chengliang Wei and Lei Yang},
journal= {arXiv preprint arXiv:1712.00883},
year = {2018}
}
Comments
18 pages, 13 figures, ApJ accepted