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Journal Article

Red quasars blow out molecular gas from galaxies during the peak of cosmic star formation


Stacey,  H. R.
Computational Structure Formation, MPI for Astrophysics, Max Planck Society;


Costa,  T.
Physical Cosmology, MPI for Astrophysics, Max Planck Society;

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Stacey, H. R., Costa, T., McKean, J. P., Sharon, C. E., Rivera, G. C., Glikman, E., et al. (2023). Red quasars blow out molecular gas from galaxies during the peak of cosmic star formation. Monthly Notices of the Royal Astronomical Society, 517(3), 3377-3391. doi:10.1093/mnras/stac2765.

Cite as: https://hdl.handle.net/21.11116/0000-000C-8F87-B
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.