Constraints on the End of Reionization from the Density Fields Surrounding Two Highly Opaque Quasar Sightlines

The observed large-scale scatter in Lyman $\alpha$ opacity of the intergalactic medium at $z<6$ implies large fluctuations neutral hydrogen fraction that are unexpected long after reionization has ended. A number models have emerged to explain these make testable predictions for relationship between Ly$\alpha$ and density. We present selections $z=5.7$ Ly$\alpha$-emitting galaxies (LAEs) fields surrounding two highly opaque quasar sightlines with troughs. lie towards $z=6.0$ ULAS J0148+0600, which we re-analyze previously published results using improved photometric selection, $z=6.15$ SDSS J1250+3130, presented here first time. In both fields, report a deficit LAEs within 20 $h^{-1}$ Mpc quasar. association galaxy underdensities is consistent driven by ionizing UV background, or an ultra-late not yet concluded $z=5.7$.