分类： 天文学 >> 天文学 提交时间： 2023-02-19
Cheng Cheng
Jia-Sheng Huang
Christopher N. A. Willmer
Hong-Xin Zhang
Matthew L. N. Ashby
Hai Xu
Marcin Sawicki
Stephane Arnouts
Stephen Gwyn
Guillaume Desprez
Jean Coupon
Anneya Golob
Piaoran Liang
Tianwen Cao
Yaru Shi
Gaoxiang Jin
Chuan He
Shumei Wu
Zijian Li
Y. Sophia Dai
摘要： We present redshifts for 2753 low-redshift galaxies between $0.03 \lesssim z_{\rm spec}\lesssim0.5$ with 18 $\leq$ $r$ $\leq$ 22 obtained with Hectospec at the Multi-Mirror Telescope (MMT). The observations targeted the XMM-LSS, ELAIS-N1 and DEEP2-3 fields, each of which covers $\sim$ 1 deg$^2$. These fields are also part of the recently completed CFHT Large Area U-band Deep Survey (CLAUDS) and on-going Hyper Suprime-Cam deep fields surveys. The efficiency of our technique for selecting low-redshift galaxies is confirmed by the redshift distribution of our sources. In addition to redshifts, these high S/N spectra are used to measure ages, metallicities, and nuclear activity levels. In combination with the photometric catalogue in $u$, $g$, $r$, $i$, $z$, $y$ down to 27 AB mag, we are able to study the galaxy population down to stellar masses of $\sim$ 10$^8 M_\odot$ . This paper presents the observational strategy, the reduction procedure and properties of the galaxy sample.
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.
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