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 μm 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 (M1450 > -25 mag) quasar currently known at z > 7. The FIR continuum is bright (1.52 mJy) and resolved with a total luminosity of LFIR = 3.5 × 1012 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 × 109 L⊙), as well as a bright core (FWHM = 235 km s-1, L[C II] = 1.9 × 109 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 × 1010 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.
- Publication:
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The Astrophysical Journal
- Pub Date:
- June 2021
- DOI:
- arXiv:
- arXiv:2104.05738
- Bibcode:
- 2021ApJ...914...36I
- Keywords:
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- Quasars;
- AGN host galaxies;
- Active galaxies;
- Interstellar medium;
- Submillimeter astronomy;
- High-redshift galaxies;
- Galaxy evolution;
- 1319;
- 2017;
- 17;
- 847;
- 1647;
- 734;
- 594;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Slightly revised version after the proof correction. 22 pages, 13 figures, 6 tables. Accepted for publication in ApJ