Statistical correlation between the distribution of Ly$\alpha$ emitters and IGM HI at $z\sim2.2$ mapped by Subaru/Hyper Suprime-Cam

Understand

The correlation between neutral Hydrogen (HI) in the intergalactic medium (IGM) and galaxies now attracts great interests.

• We select four fields which include several coherently strong Ly$\alpha$ absorption systems at $z\sim2.2$ detected by using background quasars from the whole SDSS/(e)BOSS database.
• Deep narrow-band and $g$-band imaging are performed using the Hyper Suprime-Cam on the Subaru Telescope.
• We select out 2,642 Ly$\alpha$ emitter (LAE) candidates at $z=2.177\pm0.023$ down to the Ly$\alpha$ luminosity of $L_{\text{Ly}\alpha}\approx 2 \times 10^{42} {\rm erg~s}^{-1}$ to construct the galaxy overdensity maps, covering an effective area of 5.39 deg$^2$.