https://scholars.lib.ntu.edu.tw/handle/123456789/624933
標題: | The properties of radio galaxies and the effect of environment in large-scale structures at z ~ 1 | 作者: | 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 PO-FENG WU Squires G. |
關鍵字: | Galaxies: active; Galaxies: clusters: general; Galaxies: evolution; Galaxies: groups: general; Galaxies: star formation; Radio continuum: galaxies | 公開日期: | 2017 | 卷: | 472 | 期: | 1 | 起(迄)頁: | 998-1022 | 來源出版物: | Monthly Notices of the Royal Astronomical Society | 摘要: | 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 stellarmass, 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. © 2017 The Authors. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85047143595&doi=10.1093%2fmnras%2fstx1984&partnerID=40&md5=532aa62a1351ca2394246ec489b8445f https://scholars.lib.ntu.edu.tw/handle/123456789/624933 |
ISSN: | 00358711 | DOI: | 10.1093/mnras/stx1984 | SDG/關鍵字: | Stars; Addendum; Errata; Galaxies active; Galaxies: clusters: General; Galaxies: groups: generals; Galaxies: star formation; Galaxy evolution; Radio continuum: galaxies; Galaxies |
顯示於: | 天文物理研究所 |
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