Kavli Affiliate: John D. Silverman
| First 5 Authors: Takuma Izumi, Yoshiki Matsuoka, Seiji Fujimoto, Masafusa Onoue, Michael A. Strauss
| Summary:
We present ALMA [CII] 158 $mu$m line and underlying far-infrared (FIR)
continuum emission observations ($0”.70 times 0”.56$ resolution) toward HSC
J124353.93$+$010038.5 (J1243$+$0100) at $z = 7.07$, the only low-luminosity
($M_{rm 1450} > -25$ mag) quasar currently known at $z > 7$. The FIR continuum
is 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 broad
wing (${rm FWHM} = 997$ km s$^{-1}$, $L_{rm [CII]} = 1.2 times
10^9~L_odot$) 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 of
a galactic-scale quasar-driven outflow (atomic outflow rate $> 447~M_odot$
yr$^{-1}$) at $z > 7$. The estimated large mass loading factor of the total
outflow (e.g., $gtrsim 9$ relative to the [CII]-based SFR) suggests that this
outflow will soon quench the star-formation of the host. The core gas dynamics
are 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 mass
ratio (and -to-bulge mass ratio) of $sim 0.4%$ ($sim 1%$), consistent with
the local value within uncertainties. Our results therefore suggest that the
black hole-host co-evolution relation is already in place at $z sim 7$ for
this object.
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