A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IX. The Most Overdense Region at z~5 Inhabited by a Massive Radio Galaxy

Abstract

We report on the galaxy density environment around a high-z radio galaxy (HzRG) at z=4.72, HSC J083913.17+011308.1 (HSC J0839+0113), probed using an r-dropout Lyman break galaxy (LBG) sample from the Hyper Suprime-Cam Subaru Strategic Program data. We find that HSC J0839+0113 resides in the outskirt of an overdense region identified by the r-dropout galaxies at a 4.7 sigma significance level. The projected distance between HSC J0839+0113 and the peak position of the overdense region is 0.4 physical Mpc which is shorter than the typical protocluster radius in this epoch. According to the extended Press Schechter and the light cone models, the HSC J0839+0113-hosted overdense region is expected to evolve into a halo > 10^14 Msun at z=0 with a high probability of >80 %. These findings suggest that HSC J0839+0113 is associated with a protocluster. The HSC J0839+0113 rich-system is the most overdense region of LBGs among the known protoclusters with LBGs in the same cosmic epoch.

arXiv comment7 pages, 3 figures, accepted in PASJ

References in corpus (29)

• The Second Data Release of the Sloan Digital Sky Survey
• The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
• First Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• The Hyper Suprime-Cam Software Pipeline
• Distant Radio Galaxies and their Environments
• Ancient Light from Young Cosmic Cities: Physical and Observational Signatures of Galaxy Proto-Clusters
• The Last of FIRST: The Final Catalog and Source Identifications
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV Luminosity Functions at $z\sim 4-7$ Derived with the Half-Million Dropouts on the 100 deg${}^2$ Sky
• An optically-selected cluster catalog at redshift 0.1<z<1.1 from the Hyper Suprime-Cam Subaru Strategic Program S16A data
• The bright-star masks for the HSC-SSP survey
• Why z > 1 radio-loud galaxies are commonly located in proto-clusters
• GOLDRUSH. III. A Systematic Search of Protoclusters at $z\sim 4$ Based on the $>100\mathrm{de}{\mathrm{g}}^2$ Area
• A Systematic Survey of Protoclusters at $z\sim 3-6$ in the CFHTLS Deep Fields
• Discovery of a protocluster at z~6
• Clustering of Star-forming Galaxies Near a Radio Galaxy at z=5.2
• Luminous Quasars Do Not Live in the Most Overdense Regions of Galaxies at z~4
• Strong Ly$\alpha$ Emission in an Overdense Region at $z=6.8$: A Very Large ($R\sim 3$ physical Mpc) Ionized Bubble in COSMOS?
• The clustering properties of radio-selected AGN and star-forming galaxies up to redshifts z~3
• Stellar Masses of Lyman Break Galaxies, Lyman Alpha Emitters and Radio Galaxies in Overdense Regions at z=4-6
• A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). II. Physical Properties derived from the SED Fitting with Optical, Infrared, and Radio Data
• The nature of faint radio galaxies at high redshifts
• Discovery of Protoclusters at z~3.7 & 4.9: Embedded in Primordial Superclusters
• The brightest UV-selected galaxies in protoclusters at $z\sim 4$: Ancestors of Brightest Cluster Galaxies?
• A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). I. The Optical Counterparts of FIRST Radio Sources
• Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). III. Discovery of a z = 4.72 Radio Galaxy with Lyman Break Technique
• A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed by High-z Radio Galaxies at z~4
• A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VII. Redshift Evolution of Radio Galaxy Environments at z=0.3-1.4
• Faint Quasars Live in the Same Number Density Environments as Lyman Break Galaxies at z ~ 4

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• eROSITA Final Equatorial-Depth Survey (eFEDS): eFEDS X-ray view of WERGS Radio Galaxies selected by the Subaru/HSC and VLA/FIRST survey
• High-$z$ radio Quasars in RACS I: Selection, identification, and multi-wavelength properties