A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IX. The most overdense region at <i>z</i> ∼ 5 inhabited by a massive radio galaxy-Reference-Cited by-同舟云学术

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

Published:2022-09-22 Issue:6 Volume:74 Page:L27-L32
ISSN:0004-6264
Container-title:Publications of the Astronomical Society of Japan
language:en
Short-container-title:

Author:

Uchiyama Hisakazu¹,Yamashita Takuji¹²,Nagao Tohru¹,Ono Yoshiaki³,Toshikawa Jun⁴,Ichikawa Kohei⁵⁶⁷,Kawakatu Nozomu⁸,Kajisawa Masaru¹,Toba Yoshiki¹²⁹¹⁰^ORCID,Matsuoka Yoshiki¹,Kubo Mariko¹^ORCID,Imanishi Masatoshi²¹¹^ORCID,Ito Kei¹²,Kawaguchi Toshihiro¹³,Lee Chien-Hsiu¹⁴,Saito Tomoki¹⁵

Affiliation:

1. Research Center for Space and Cosmic Evolution, Ehime University , 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577 , Japan

2. National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan

3. Institute for Cosmic Ray Research, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582 , Japan

4. Department of Physics, University of Bath , Claverton Down, Bath BA2 7AY , UK

5. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University , Sendai, Miyagi 980-8578 , Japan

6. Astronomical Institute, Tohoku University , 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578 , Japan

7. Max-Planck-Institut für extraterrestrische Physik (MPE) , Giessenbachstrasse 1, D-85748 Garching bei München , Germany

8. National Institute of Technology , Kure College, 2-2-11 Agaminami, Kure, Hiroshima 737-8506 , Japan

9. Department of Astronomy, Kyoto University , Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502 , Japan

10. Academia Sinica Institute of Astronomy and Astrophysics , 11F of Astronomy-Mathematics Building, AS/NTU, No.1, Section 4 , Roosevelt Road, Taipei 10617, Taiwan

11. Department of Astronomical Science, The Graduate University for Advanced Studies , SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 , Japan

12. Department of Astronomy, School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 , Japan

13. Department of Economics, Management and Information Science, Onomichi City University , 1600-2 Hisayamada, Onomichi, Hiroshima 722-8506 , Japan

14. NSF’s National Optical-Infrared Astronomy Research Laboratory , Tucson, AZ 85742 , USA

15. Nishi-Harima Astronomical Observatory, Centre for Astronomy, University of Hyogo , 407-2 Nishigaichi, Sayo-cho, Sayo, Hyogo 679-5313 , Japan

Abstract

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 ${M_{\odot}}$ 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.

Funder

Japan Society for the Promotion of Science

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

https://academic.oup.com/pasj/article-pdf/74/6/L27/47471036/psac075.pdf

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