An empirical model to form and evolve galaxies in dark matter halos  

作　　者：Shi-Jie Li You-Cai Zhang Xiao-Hu Yang Hui-Yuan Wang Dylan Tweed Cheng-Ze Liu Lei Yang Feng Shi Yi Lu Wen-Tao Luo Jian-Wen Wei 

机构地区：[1]Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,Shanghai 200030,China [2]Center for Astronomy and Astrophysics,Shanghai Jiao Tong University,Shanghai 200240,China [3]IFSA Collaborative Innovation Center,Shanghai Jiao Tong University,Shanghai 200240,China [4]Key Laboratory for Research in Galaxies and Cosmology,Department of Astronomy,University of Science and Technology of China,Hefei 230026,China [5]Center for High Performance Computing,Shanghai Jiao Tong University,Shanghai 200240,China [6]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2016年第8期113-126,共14页天文和天体物理学研究（英文版）

基　　金：supported by the 973 Program(No.2015CB857002);the National Natural Science Foundation of China(Grant Nos.11203054,11128306,11121062,11233005,11073017and 11421303);NCET-11-0879,the Strategic Priority Research Program“The Emergence of Cosmological Structures”of the Chinese Academy of Sciences,Grant No.XDB09000000;the Shanghai Committee of Science and Technology,China(Grant No.12ZR1452800);supported by the High Performance Computing Resource in the Core Facility for Advanced Research Computing at Shanghai Astronomical Observatory

摘　　要：Based on the star formation histories of galaxies in halos with different masses, we develop an empirical model to grow galaxies in dark matter halos. This model has very few ingredients, any of which can be associated with observational data and thus be efficiently assessed. By applying this model to a very high resolution cosmological N-body simulation, we predict a number of galaxy properties that are a very good match to relevant observational data. Namely, for both centrals and satellites, the galaxy stellar mass functions up to redshift z=4 and the conditional stellar mass functions in the local universe are in good agreement with observations. In addition, the two point correlation function is well predicted in the different stellar mass ranges explored by our model. Furthermore, after applying stellar population synthesis models to our stellar composition as a function of redshift, we find that the luminosity functions in the 0.1 u,0.19, 0.1r, 0.1i and 0.1z bands agree quite well with the SDSS observational results down to an absolute magnitude at about -17.0. The SDSS conditional luminosity function itself is predicted well. Finally, the cold gas is derived from the star formation rate to predict the HI gas mass within each mock galaxy. We find a remarkably good match to observed HI-to-stellar mass ratios. These features ensure that such galaxy/gas catalogs can be used to generate reliable mock redshift surveys.Based on the star formation histories of galaxies in halos with different masses, we develop an empirical model to grow galaxies in dark matter halos. This model has very few ingredients, any of which can be associated with observational data and thus be efficiently assessed. By applying this model to a very high resolution cosmological N-body simulation, we predict a number of galaxy properties that are a very good match to relevant observational data. Namely, for both centrals and satellites, the galaxy stellar mass functions up to redshift z=4 and the conditional stellar mass functions in the local universe are in good agreement with observations. In addition, the two point correlation function is well predicted in the different stellar mass ranges explored by our model. Furthermore, after applying stellar population synthesis models to our stellar composition as a function of redshift, we find that the luminosity functions in the 0.1 u,0.19, 0.1r, 0.1i and 0.1z bands agree quite well with the SDSS observational results down to an absolute magnitude at about -17.0. The SDSS conditional luminosity function itself is predicted well. Finally, the cold gas is derived from the star formation rate to predict the HI gas mass within each mock galaxy. We find a remarkably good match to observed HI-to-stellar mass ratios. These features ensure that such galaxy/gas catalogs can be used to generate reliable mock redshift surveys.

关 键 词：COSMOLOGY dark matter -- galaxies： formation -- galaxies HALOS 

分 类 号：P152[天文地球—天文学]