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We conduct intensity mapping to probe for extended diffuse Ly$\alpha$emission around Ly$\alpha$ emitters (LAEs) at $z\sim2-7$, exploiting very deep($\sim26$ mag at $5\sigma$) and large-area ($\sim4.5$ deg$^2$) Subaru/HyperSuprime-Cam narrow-band (NB) images and large LAE catalogs consisting of atotal of 1781 LAEs at $z=2.2$, $3.3$, $5.7$, and $6.6$ obtained by the HSC-SSPSILVERRUSH and CHORUS projects. We calculate the spatial correlations of theseLAEs with $\sim1-2$ billion pixel flux values of the NB images, deriving theaverage Ly$\alpha$ surface brightness (${\rm SB_{Ly\alpha}}$) radial profilesaround the LAEs. By carefully estimating systematics such as fluctuations ofsky background and point spread functions, we detect diffuse Ly$\alpha$emission ($\sim10^{-20}-10^{-19}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$) at$100-1000$ comoving kpc around $z=3.3$ LAEs at the $4.1\sigma$ level andtentatively ($\sim2\sigma$) at the other redshifts, beyond the virial radius ofa dark-matter halo with a mass of $10^{11}\ M_\odot$. While the observed ${\rmSB_{Ly\alpha}}$ profiles have similar amplitudes at $z=2.2-6.6$ within theuncertainties, the intrinsic ${\rm SB_{Ly\alpha}}$ profiles (corrected for thecosmological dimming effect) increase toward high redshifts. This trend may beexplained by increasing hydrogen gas density due to the evolution of the cosmicvolume. Comparisons with theoretical models suggest that extended Ly$\alpha$emission around a LAE is powered by resonantly scattered Ly$\alpha$ photons inthe CGM and IGM that originates from the inner part of the LAE, and/orneighboring galaxies around the LAE.

SILVERRUSH. XI. Intensity Mapping for Lya Emission Extending over $100-1000$ comoving kpc around $z\sim2-7$ LAEs with Subaru HSC-SSP and CHORUS Data