S19A0032abst
S19A0032
We aim to understand the origin of the observed large-scale distribution of the effective Lyα forest opacity (τeff, averaged on ∼70 cMpc scales) of the intergalactic medium at the end tail of cosmic reionization. It has been known that the large variations in observed τeff at z>∼5.5 cannot be explained by the density fluctuations alone, and thus additional fluctuations in the ionizing background and/or the temperature of the IGM are required. Three possible scenarios have been proposed to account for the observed τeff variation, which predict contradictory relationships between galaxy distribution and the IGM opacity structure. Constraining the scenarios of the end of reionization must provide us with new insights about the detailed process at earlier epochs of cosmic reionization. To examine these models, we propose HSC observations of the fields of luminous quasars at z∼6 for which extremely high or low τeff have been measured in their Lyα forest. Using the r2, i2, z band images, we search for Lyman Break Galaxies, as tracers of the large-scale density field, and quasar candidates within the large cylindrical regions across z=5.4–6.0 covered by the HSC field-of-view (100 cMpc in radius), whose size is well suited to our experiment.
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