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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 742854.0, MPI für Astronomie / Publikationen_mpia
The properties of radio galaxies and the effect of environment in large-scale structures at z ˜ 1
Authors:Shen, L.; Miller, N. A.; Lemaux, B. C.; Tomczak, A. R.; Lubin, L. M.; Rumbaugh, N.; Fassnacht, C. D.; Becker, R. H.; Gal, R. R.; Wu, P.-F.; Squires, G.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:472
Start Page:998
End Page:1022
Audience:Not Specified
Abstract / Description:In this study, we investigate 89 radio galaxies that are spectroscopically confirmed to be members of five large-scale structures (LSSs) in the redshift range of 0.65 ≤ z ≤ 0.96. Based on a two-stage classification scheme, the radio galaxies are classified into three sub-classes: active galactic nucleus (AGN), Hybrid, and star-forming galaxy (SFG). We study the properties of the three radio sub-classes and their global and local environmental preferences. We find AGN hosts are the most massive population and exhibit quiescence in their star formation activity. The SFG population has a comparable stellar mass to those hosting a radio AGN but are unequivocally powered by star formation. Hybrids, though selected as an intermediate population in our classification scheme, were found in almost all analyses to be a unique type of radio galaxies rather than a mixture of AGN and SFGs. They are dominated by a high-excitation radio galaxy population. We discuss environmental effects and scenarios for each sub-class. AGN tend to be preferentially located in locally dense environments and in the cores of clusters/groups, with these preferences persisting when comparing to galaxies of similar colour and stellar mass, suggesting that their activity may be ignited in the cluster/group virialized core regions. Conversely, SFGs exhibit a strong preference for intermediate-density global environments, suggesting that dusty starbursting activity in LSSs is largely driven by galaxy-galaxy interactions and merging.
Free Keywords:galaxies: active; galaxies: clusters: general; galaxies: evolution; galaxies: groups: general; galaxies: star formation; radio continuum: galaxies; galaxies: active - galaxies: clusters: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711
URL:http://adsabs.harvard.edu/abs/2017MNRAS.472..998S
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