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We present ALMA [CII] 158 $\mu$m line and underlying far-infrared (FIR)continuum emission observations ($0''.70 \times 0''.56$ resolution) toward HSCJ124353.93$+$010038.5 (J1243$+$0100) at $z = 7.07$, the only low-luminosity($M_{\rm 1450} > -25$ mag) quasar currently known at $z > 7$. The FIR continuumis bright (1.52 mJy) and resolved with a total luminosity of $L_{\rm FIR} = 3.5\times 10^{12}~L_\odot$. The spatially extended component is responsible for$\sim 40\%$ of the emission. The area-integrated [CII] spectrum shows a broadwing (${\rm FWHM} = 997$ km s$^{-1}$, $L_{\rm [CII]} = 1.2 \times10^9~L_\odot$) as well as a bright core (${\rm FWHM} = 235$ km s$^{-1}$,$L_{\rm [CII]} = 1.9 \times 10^9~L_\odot$). This wing is the first detection ofa galactic-scale quasar-driven outflow (atomic outflow rate $> 447~M_\odot$yr$^{-1}$) at $z > 7$. The estimated large mass loading factor of the totaloutflow (e.g., $\gtrsim 9$ relative to the [CII]-based SFR) suggests that thisoutflow will soon quench the star-formation of the host. The core gas dynamicsare governed by rotation, with a rotation curve suggestive of a compact bulge($\sim 3.3 \times 10^{10}~M_\odot$), although it is not yet spatially resolved.Finally, we found that J1243$+$0100 has a black hole mass-to-dynamical massratio (and -to-bulge mass ratio) of $\sim 0.4\%$ ($\sim 1\%$), consistent withthe local value within uncertainties. Our results therefore suggest that theblack hole-host co-evolution relation is already in place at $z \sim 7$ forthis object.

astrophysical journal/the astrophysical journal

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XIII.  Large-scale Feedback and Star Formation in a Low-Luminosity Quasar at z =  7.07 on the Local Black Hole to Host Mass Relation