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
Abstract We present Atacama Large Millimeter/submillimeter Array [C ii ] 158 μ m line and underlying far-infrared (FIR) continuum emission observations (0.″70 × 0.″56 resolution) toward HSC J124353.93+010038.5 (J1243+0100) at z = 7.07, the only low-luminosity ( M 1450 > −25 mag) quasar currently...
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Published in | The Astrophysical journal Vol. 914; no. 1; pp. 36 - 52 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Philadelphia
The American Astronomical Society
01.06.2021
IOP Publishing |
Subjects | |
Online Access | Get full text |
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Summary: | Abstract
We present Atacama Large Millimeter/submillimeter Array [C
ii
] 158
μ
m line and underlying far-infrared (FIR) continuum emission observations (0.″70 × 0.″56 resolution) toward HSC J124353.93+010038.5 (J1243+0100) at
z
= 7.07, the only low-luminosity (
M
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
FIR
= 3.5 × 10
12
L
⊙
. The spatially extended component is responsible for ∼40% of the emission. The area-integrated [C
ii
] spectrum shows a broad wing (FWHM = 997 km s
−1
,
L
[C
ii
]
= 1.2 × 10
9
L
⊙
), as well as a bright core (FWHM = 235 km s
−1
,
L
[C
ii
]
= 1.9 × 10
9
L
⊙
). This wing is the first detection of a galactic-scale quasar-driven outflow (atomic outflow rate >447
M
⊙
yr
−1
) at
z
> 7. The estimated large mass-loading factor of the total outflow (e.g., ≳9 relative to the [C
ii
]-based star formation rate) 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 (∼3.3 × 10
10
M
⊙
), although it is not yet spatially resolved. Finally, we found that J1243+0100 has a black hole mass–to–dynamical mass (and –to–bulge mass) ratio of ∼0.4% (∼1%), consistent with the local value within the uncertainties. Our results therefore suggest that the black hole–host coevolution relation is already in place at
z
∼ 7 for this object. |
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Bibliography: | Galaxies and Cosmology AAS30626 |
ISSN: | 0004-637X 1538-4357 |
DOI: | 10.3847/1538-4357/abf6dc |