Subaru high-z exploration of low-luminosity quasars (SHELLQs) - XV. constraining the cosmic reionization at 5.5 < z < 7

Lu, Ting Yi and Goto, Tomotsugu and Hashimoto, Tetsuya and Santos, Daryl Joe D. and Wong, Yi Hang Valerie and Kim, Seong Jin and Hsiao, Tiger Y.Y. and Kilerci, Ece and Ho, Simon C.C. and Nagao, Tohru and Matsuoka, Yoshiki and Onoue, Masafusa and Toba, Yoshiki (2022) Subaru high-z exploration of low-luminosity quasars (SHELLQs) - XV. constraining the cosmic reionization at 5.5 < z < 7. Monthly Notices of the Royal Astronomical Society, 517 (1). pp. 1264-1281. ISSN 0035-8711 (Print) 1365-2966 (Online)

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Revealing the cosmic hydrogen reionization history is one of the main goals of the modern cosmology. z > 5 quasars (QSOs) have been used as back-lights to investigate the evolution of the intervening intergalactic medium (IGM) during the cosmic reionization since their first discovery. However, due to the small population of luminous QSOs (∼130 QSOs known to date), a tight constraint on the reionization history has not yet been placed. In this work, we aim to tighten the constraint using the 93 QSOs (5.5 < z < 7.1) recently discovered in the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQS) project. This is the largest QSO sample used to constrain the epoch of reionization. We measure the mean IGM Ly α transmission and the QSO near-zone size using the UV spectra of these QSOs. The mean IGM Ly α transmission rises above zero at z ≲ 6, indicating the end of the reionization. The near-zone sizes of the SHELLQs QSOs are consistent with sizes spanned by QSOs of lifetime tq ∼ 1–100 Myr in simulations. Due to the scatter created by the low signal-to-noise spectra and large Ly α redshift uncertainty, we cannot conclude whether the redshift evolution of the near-zone size is affected by the reionization effect.
Item Type: Article
Uncontrolled Keywords: (cosmology:) dark ages, reionization, first stars; (cosmology:) observations; (galaxies:) intergalactic medium; (galaxies:) quasars: general; (galaxies:) quasars:absorption lines
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ece Kilerci
Date Deposited: 16 Apr 2023 17:00
Last Modified: 16 Apr 2023 17:00

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