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arxiv: 2508.21229 · v2 · pith:EI2I24GEnew · submitted 2025-08-28 · 🌌 astro-ph.GA

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XXIV. 54 New Quasars and Candidate Obscured Quasars at 5.71 le z le 7.02

Yoshiki Matsuoka , Kazushi Iwasawa , Masafusa Onoue , Takuma Izumi , Michael A. Strauss , Masayuki Akiyama , Kentaro Aoki , Junya Arita
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Xuheng Ding Masatoshi Imanishi Nobunari Kashikawa Toshihiro Kawaguchi Satoshi Kikuta Kotaro Kohno Chien-Hsiu Lee Tohru Nagao Camryn L. Phillips Mahoshi Sawamura John D. Silverman Ayumi Takahashi Yoshiki Toba
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keywords quasarsshellqssubarucandidateexplorationgalaxieslow-luminosityobscured
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We present spectroscopic identification of 43 quasars and 11 candidate obscured quasars in the epoch of reionization (EoR) at $5.71 \le z \le 7.02$, 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 $z \sim 2$, 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.

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  1. A first look at quasar-galaxy clustering at $z\simeq7.3$

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    JWST data on two z~7.3 quasars yields a quasar-galaxy correlation length of 7.6 h^{-1} cMpc, a minimum halo mass of 10^{11.6} solar masses, and a duty cycle of 0.05%.