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This is a Quantitative Study study.

October 3, 2025Open Access

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XXIV. 54 New Quasars and Candidate Obscured Quasars at 5. 71 z 7. 02

Key Points

Identification of 43 quasars and 11 candidate obscured quasars at redshifts between 5.71 and 7.02 indicates significant findings in the early universe.
The study also reports the identification of 29 galaxies and five strong [O III] line emitters, enhancing our understanding of cosmic structure.
Using the Hyper Suprime-Cam survey, this paper marks a substantial contribution to the SHELLQs project focusing on low-luminosity quasars.
These findings highlight the importance of spectroscopic observations in uncovering quasar candidates and their surrounding environments.

Abstract

We present spectroscopic identification of 43 quasars and 11 candidate obscured quasars in the epoch of reionization (EoR) at 5. 71 z 7. 02, along with 29 galaxies at similar redshifts. This is the 24th publication from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) imaging survey to search for EoR quasars. The HSC-SSP survey has completed, and this paper is likely the final installment of major (unobscured) quasar discoveries from the SHELLQs project. In addition to the EoR objects, we identified five strong O III line emitters at z < 1, 30 Galactic brown dwarfs, and 14 passive galaxies at z 2, which contaminated our sample of photometric quasar candidates. The present paper focuses on describing the immediate outcome of the spectroscopic observations, while a statistical analysis of the full SHELLQs sample will be presented in our next publication.

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XXIV. 54 New Quasars and Candidate Obscured Quasars at 5. 71 z 7. 02

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Abstract

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