Subaru hyper suprime-cam excavates colossal over- And underdense structures over 360 deg2 out to z = 1

Rhythm Shimakawa, Yuichi Higuchi, Masato Shirasaki, Masayuki Tanaka, Yen Ting Lin, Masao Hayashi, Rieko Momose, Chien Hsiu Lee, Haruka Kusakabe, Tadayuki Kodama, Naoaki Yamamoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Subaru Strategic Program with the Hyper-Suprime Cam (HSC-SSP) has proven to be successful with its extremely wide area coverage in past years. Taking advantages of this feature, we report initial results from exploration and research of expansive over- and underdense structures at z = 0.3–1 based on the second Public Data Release where optical 5-band photometric data for ∼ eight million sources with i < 23 mag are available over ∼360 deg2. We not only confirm known superclusters but also find candidates of titanic over- and underdense regions out to z = 1. The mock data analysis suggests that the density peaks would involve one or more massive dark matter haloes (>1014 M) of the redshift, and the density troughs tend to be empty of massive haloes over >10 comoving Mpc. Besides, the density peaks and troughs at z ≾ 0.6 are in part identified as positive and negative weak lensing signals respectively, in mean tangential shear profiles, showing a good agreement with those inferred from the full-sky weak lensing simulation. The coming extensive spectroscopic surveys will be able to resolve these colossal structures in 3D space. The number density information over the entire survey field is available as grid-point data on the website of the HSC-SSP data release (

Original languageEnglish
Pages (from-to)3896-3912
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 2021 May 1


  • Galaxies: general
  • Large-scale structure of universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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