分类： 天文学 >> 天文学 提交时间： 2023-02-19
Lu Shen
Brian C. Lemaux
Lori M. Lubin
Olga Cucciati
Olivier Le Fevre
Guilin Liu
Wenjuan Fang
Debora Pelliccia
Adam Tomczak
John McKean
Neal A. Miller
Christopher D. Fassnacht
Roy Gal
Denise Hung
Nimish Hathi
Sandro Bardelli
Daniela Vergani
Elena Zucca
摘要： Radio Active Galactic Nuclei (RAGNs) are mainly found in dense structures (i.e., clusters/groups) at redshifts of z$<$2 and are commonly used to detect protoclusters at higher redshift. Here, we attempt to study the host and environmental properties of two relatively faint ($\mathrm L_\mathrm{1.4GHz} \sim10^{25}$ W Hz$^{-1}$) RAGNs in a known protocluster at z=3.3 in the PCl J0227-0421 field, detected using the latest radio observation obtained as part of the Observations of Redshift Evolution in Large-Scale Environments (ORELSE) Survey. Using new spectroscopic observations obtained from Keck/MOSFIRE as part of the Charting Cluster Construction with the VIMOS Ultra-Deep Survey (VUDS) and ORELSE (C3VO) survey and previous spectroscopic data obtained as part of the VIMOS-VLT Deep Survey (VVDS) and VUDS, we revise the three-dimensional overdensity field around this protocluster. The protocluster is embedded in a large scale overdensity protostructure. This protostructure has an estimated total mass of $\sim$2.6$\times10^{15} M_\odot$ and contains several overdensity peaks. Both RAGNs are hosted by very bright and massive galaxies, while their hosts show extreme differences color, indicating that they have different ages and are in different evolutionary stages. Furthermore, we find that they are not in the most locally dense parts of the protostructure, but are fairly close to the centers of their parent overdensity peaks. We propose a scenario where merging might already have happened in both cases, which lowered the local density of their surrounding area and boosted their stellar mass. This work is the first time that two RAGNs at low luminosity have been found and studied within a high redshift protostructure.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Lu Shen
Brian C. Lemaux
Lori M. Lubin
Guilin Liu
Matthieu Béthermin
Médéric Boquien
Olga Cucciati
Olivier Le Fèvre
Margherita Talia
Daniela Vergani
Gianni Zamorani
Andreas L. Faisst
Michele Ginolfi
Carlotta Gruppioni
Gareth C. Jones
Sandro Bardelli
Nimish Hathi
Anton M. Koekemoer
Michael Romano
Daniel Schaerer
摘要： We present the radio properties of 66 spectroscopically-confirmed normal
star-forming galaxies (SFGs) at $4.4
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