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

Hisakazu Uchiyama; Takuji Yamashita; Tohru Nagao; Yoshiaki Ono; Jun Toshikawa; Kohei Ichikawa; Nozomu Kawakatu; Masaru Kajisawa; Yoshiki Toba; Yoshiki Matsuoka; Mariko Kubo; Masatoshi Imanishi; Kei Ito; Toshihiro Kawaguchi; Chien-Hsiu Lee; Tomoki Saito

doi:10.1093/pasj/psac075

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

Hisakazu Uchiyama, Takuji Yamashita, Tohru Nagao, Yoshiaki Ono, Jun Toshikawa, Kohei Ichikawa, Nozomu Kawakatu, Masaru Kajisawa, Yoshiki Toba, Yoshiki Matsuoka, Mariko Kubo, Masatoshi Imanishi, Kei Ito, Toshihiro Kawaguchi, Chien-Hsiu Lee, Tomoki Saito

Department of Physics

Research output: Contribution to journal › Letter › peer-review

2 Citations (SciVal)

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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 outskirts of an overdense region identified by the r-dropout galaxies at a 4.7σ 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 >1014 M⊙ 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.

Original language	English
Pages (from-to)	L27-L32
Journal	Publications of the Astronomical Society of Japan
Volume	74
Issue number	6
Early online date	22 Sept 2022
DOIs	https://doi.org/10.1093/pasj/psac075
Publication status	Published - 31 Dec 2022

Bibliographical note

HU acknowledges support from the JSPS grant 22K14075 and 21H04490. TY acknowledges support from the JSPS grant 21K13968 and 20H01939. TN acknowledges support from the JSPS grant 20H01949.

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10.1093/pasj/psac075

Uchiyama2022b_arXiv
This is a pre-copyedited, author-produced version of an article accepted for publication in Publications of the Astronomical Society of Japan following peer review. The version of record Hisakazu Uchiyama, Takuji Yamashita, Tohru Nagao, Yoshiaki Ono, Jun Toshikawa, Kohei Ichikawa, Nozomu Kawakatu, Masaru Kajisawa, Yoshiki Toba, Yoshiki Matsuoka, Mariko Kubo, Masatoshi Imanishi, Kei Ito, Toshihiro Kawaguchi, Chien-Hsiu Lee, Tomoki Saito, 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, Publications of the Astronomical Society of Japan, Volume 74, Issue 6, December 2022, Pages L27–L32 is available online at: https://doi.org/10.1093/pasj/psac075
Accepted author manuscript, 1.71 MB

Astrophysics at the University of Bath 2020-2023
Wuyts, S. (PI) & Toshikawa, J. (Researcher)
Science and Technology Facilities Council
1/04/20 → 31/03/24
Project: Research council

Cite this

Uchiyama, H., Yamashita, T., Nagao, T., Ono, Y., Toshikawa, J., Ichikawa, K., Kawakatu, N., Kajisawa, M., Toba, Y., Matsuoka, Y., Kubo, M., Imanishi, M., Ito, K., Kawaguchi, T., Lee, C.-H., & Saito, T. (2022). 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. Publications of the Astronomical Society of Japan, 74(6), L27-L32. https://doi.org/10.1093/pasj/psac075

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. / Uchiyama, Hisakazu; Yamashita, Takuji; Nagao, Tohru et al.
In: Publications of the Astronomical Society of Japan, Vol. 74, No. 6, 31.12.2022, p. L27-L32.

Research output: Contribution to journal › Letter › peer-review

Uchiyama, H, Yamashita, T, Nagao, T, Ono, Y, Toshikawa, J, Ichikawa, K, Kawakatu, N, Kajisawa, M, Toba, Y, Matsuoka, Y, Kubo, M, Imanishi, M, Ito, K, Kawaguchi, T, Lee, C-H & Saito, T 2022, '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', Publications of the Astronomical Society of Japan, vol. 74, no. 6, pp. L27-L32. https://doi.org/10.1093/pasj/psac075

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title = "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 outskirts of an overdense region identified by the r-dropout galaxies at a 4.7σ 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 >1014 M⊙ 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.",

author = "Hisakazu Uchiyama and Takuji Yamashita and Tohru Nagao and Yoshiaki Ono and Jun Toshikawa and Kohei Ichikawa and Nozomu Kawakatu and Masaru Kajisawa and Yoshiki Toba and Yoshiki Matsuoka and Mariko Kubo and Masatoshi Imanishi and Kei Ito and Toshihiro Kawaguchi and Chien-Hsiu Lee and Tomoki Saito",

note = "HU acknowledges support from the JSPS grant 22K14075 and 21H04490. TY acknowledges support from the JSPS grant 21K13968 and 20H01939. TN acknowledges support from the JSPS grant 20H01949.",

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T1 - 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

AU - Uchiyama, Hisakazu

AU - Yamashita, Takuji

AU - Nagao, Tohru

AU - Ono, Yoshiaki

AU - Toshikawa, Jun

AU - Ichikawa, Kohei

AU - Kawakatu, Nozomu

AU - Kajisawa, Masaru

AU - Toba, Yoshiki

AU - Matsuoka, Yoshiki

AU - Kubo, Mariko

AU - Imanishi, Masatoshi

AU - Ito, Kei

AU - Kawaguchi, Toshihiro

AU - Lee, Chien-Hsiu

AU - Saito, Tomoki

N1 - HU acknowledges support from the JSPS grant 22K14075 and 21H04490. TY acknowledges support from the JSPS grant 21K13968 and 20H01939. TN acknowledges support from the JSPS grant 20H01949.

PY - 2022/12/31

Y1 - 2022/12/31

N2 - 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 outskirts of an overdense region identified by the r-dropout galaxies at a 4.7σ 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 >1014 M⊙ 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.

AB - 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 outskirts of an overdense region identified by the r-dropout galaxies at a 4.7σ 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 >1014 M⊙ 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.

U2 - 10.1093/pasj/psac075

DO - 10.1093/pasj/psac075

M3 - Letter

SN - 0004-6264

VL - 74

SP - L27-L32

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 6

ER -

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

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Astrophysics at the University of Bath 2020-2023

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