分类： 天文学 >> 天文学 提交时间： 2023-02-19
Qingyang Li
Xiaohu Yang
Chengze Liu
Yipeng Jing
Min He
Jiasheng Huang
Y. Sophia Dai
Marcin Sawicki
Stephane Arnouts
Stephen Gwyn
Thibaud Moutard
H. J. Mo
Kai Wang
Antonios Katsianis
Weiguang Cui
Jiaxin Han
I-Non Chiu
Yizhou Gu
Haojie Xu
摘要： Using the extended halo-based group finder developed by Yang et al. (2021), which is able to deal with galaxies via spectroscopic and photometric redshifts simultaneously, we construct galaxy group and candidate protocluster catalogs in a wide redshift range ($0 2.0$. By checking the galaxy number distributions within a $5-7\ h^{-1}\mathrm{Mpc}$ projected separation and a redshift difference $\Delta z \le 0.1$ around those richest groups at redshift $z>2$, we identified a list of 761, 343 and 43 protocluster candidates in the redshift bins $2\leq z<3$, $3\leq z<4$ and $z \geq 4$, respectively. In general, these catalogs of galaxy groups and protocluster candidates will provide useful environmental information in probing galaxy evolution along the cosmic time.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Jiaqi Wang
Xiaohu Yang
Jun Zhang
Hekun Li
Matthew Fong
Haojie Xu
Min He
Yizhou Gu
Wentao Luo
Fuyu Dong
Yirong Wang
Qingyang Li
Antonios Katsianis
Haoran Wang
Zhi Shen
Pedro Alonso
Cong Liu
Yiqi Huang
Zhenjie Liu
摘要： Based on a large group/cluster catalog recently constructed from the DESI Legacy Imaging Surveys DR9 using an extended halo-based group finder, we measure and model the group-galaxy weak lensing signals for groups/clusters in a few redshift bins within redshift range $0.1 \leqslant z<0.6$. Here, the background shear signals are obtained based on the DECaLS survey shape catalog derived with the \textsc{Fourier\_Quad} method. We divide the lens samples into 5 equispaced redshift bins and 7 mass bins, which allow us to probe the redshift and mass dependence of the lensing signals and hence the resulting halo properties. In addition to these sample selections, we have also checked the signals around different group centers, e.g., brightest central galaxy (BCG), luminosity weighted center and number weighted center. We use a lensing model that includes off-centering to describe the lensing signals we measure for all mass and redshift bins. The results demonstrate that our model predictions for the halo masses, bias and concentrations are stable and self-consistent among different samples for different group centers. Taking advantage of the very large and complete sample of groups/clusters, as well as the reliable estimation of their halo masses, we provide measurements of the cumulative halo mass functions up to redshift $z=0.6$, with a mass precision at $0.03\sim0.09$ dex.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Xiaohu Yang
Haojie Xu
Min He
Yizhou Gu
Antonios Katsianis
Jiacheng Meng
Feng Shi
Hu Zou
Youcai Zhang
Chengze Liu
Zhaoyu Wang
Fuyu Dong
Yi Lu
Qingyang Li
Yangyao Chen
Huiyuan Wang
Houjun Mo
Jian Fu
Hong Guo
Alexie Leauthaud
摘要： We extend the halo-based group finder developed by \citet[][]{Yang2005a} to
use data {\it simultaneously} with either photometric or spectroscopic
redshifts. A mock galaxy redshift survey constructed from a high-resolution
N-body simulation is used to evaluate the performance of this extended group
finder. For galaxies with magnitude ${\rm z\le 21}$ and redshift $0
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