King Ghidorah Supercluster: Mapping the light and dark matter in a new supercluster at z =&nbsp;0.55 using the subaru hyper suprime-cam

Shimakawa, Rhythm; Okabe, Nobuhiro; Shirasaki, Masato; Tanaka, Masayuki

doi:10.1093/mnrasl/slac150

King Ghidorah Supercluster: Mapping the light and dark matter in a new supercluster at z = 0.55 using the subaru hyper suprime-cam

Journal Article · Sat Nov 26 00:00:00 EST 2022 · Monthly Notices of the Royal Astronomical Society: Letters

DOI:https://doi.org/10.1093/mnrasl/slac150· OSTI ID:1902179

; ; Shirasaki, Masato; Tanaka, Masayuki

ABSTRACT

This paper reports our discovery of the most massive supercluster, termed the King Ghidorah Supercluster (KGSc), at z = 0.50–0.64 in the Third Public Data Release of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP PDR3) over 690 deg2, as well as an initial result for a galaxy and dark matter mapping. The primary structure of the KGSc comprises triple broad weak-lensing (WL) peaks over 70 comoving Mpc. Such extensive WL detection at z > 0.5 can only currently be achieved using the wide-field high-quality images produced by the HSC-SSP. The structure is also contiguous with multiple large-scale structures across a ∼400 comoving Mpc scale. The entire field has a notable overdensity (δ = 14.7 ± 4.5) of red-sequence clusters. Additionally, large-scale underdensities can be found in the foreground along the line of sight. We confirmed the overdensities in stellar mass and dark matter distributions to be tightly coupled and estimated the total mass of the main structure to be 1 × 1016 solar masses, according to the mock data analyses based on large-volume cosmological simulations. Further, upcoming wide-field multi-object spectrographs such as the Subaru Prime Focus Spectrograph may aid in providing additional insights into distant superclusters beyond the 100 Mpc scale.

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Sponsoring Organization:: USDOE

OSTI ID:: 1902179

Journal Information:: Monthly Notices of the Royal Astronomical Society: Letters, Journal Name: Monthly Notices of the Royal Astronomical Society: Letters Journal Issue: 1 Vol. 519; ISSN 1745-3925

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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