Active Galactic Nucleus Environments and Feedback to Neighboring Galaxies at z ∼ 5 Probed by Lyα Emitters∗

• DOI: 10.3847/1538-4357/aa72f0
• Publication Date: 2017-06-05T13:13:52Z
• Authors: Satoshi Kikuta; Masatoshi Imanishi; Yoshiki Matsuoka; Yuichi Matsuda; Kazuhiro Shimasaku; Fumiaki Nakata
• Keywords: QSOS; Subaru Telescope

Active galactic nuclei (AGNs) in the high-redshift Universe are thought to reside overdense environments. However, recent works provide controversial results partly due use of different techniques and possible suppression nearby galaxy formation by AGN feedback. We conducted deep wide-field imaging observations with Suprime-Cam on Subaru telescope searched for Lyman-alpha emitters (LAEs) around two QSOs (quasi-stellar objects) at $z\sim4.9$ a radio $z\sim4.5$ using narrow-band filters address these issues more robustly. In QSO fields, we obtained additional broad-band images select Lyman-break galaxies (LBGs) $z\sim5$ comparison. constructed photometric sample 301 LAEs 170 LBGs total. A wide field view (34arcmin$\times$27arcmin, corresponding 80$\times$60 comoving Mpc$^2$) enabled us probe immediate vicinities AGNs blank fields simultaneously compare various properties them consistent manner. The located near local density peaks ($<2σ$) one has close companion LAE projected separation 80 physical kpc. is found be void LAEs. number densities LAEs/LGBs larger spatial scale not significantly from those fields. No sign feedback down $L_{Lyα}\sim10^{41.8}\mathrm{~erg~s^{-1}}$. Our suggest that associated extreme overdensity this cannot attributed effect