400 pc Imaging of a Massive Quasar Host Galaxy at a Redshift of 6.6

We report high spatial resolution (∼0 076, 410 pc) Atacama Large Millimeter/submillimeter Array imaging of the dust continuum and the ionized carbon line [C ii] in a luminous quasar host galaxy at z = 6.6, 800 million years after the big bang. Based on previous studies, this galaxy hosts a ∼1 × 109...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2019-04, Vol.874 (2), p.L30
Main Authors: Venemans, Bram P., Neeleman, Marcel, Walter, Fabian, Novak, Mladen, Decarli, Roberto, Hennawi, Joseph F., Rix, Hans-Walter
Format: Article
Language:English
Subjects:
Active galactic nuclei
cosmology: observations
Deposition
Energy
Galaxies
galaxies: active
galaxies: high-redshift
galaxies: ISM
galaxies: star formation
High resolution
Kinematics
Morphology
Quasars
quasars: individual (VIK J030516.92-315056)
Radio telescopes
Red shift
Space telescopes
Spatial resolution
Star & galaxy formation
Star formation
Star formation rate
Stars
Stars & galaxies
Supernovae
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Summary:We report high spatial resolution (∼0 076, 410 pc) Atacama Large Millimeter/submillimeter Array imaging of the dust continuum and the ionized carbon line [C ii] in a luminous quasar host galaxy at z = 6.6, 800 million years after the big bang. Based on previous studies, this galaxy hosts a ∼1 × 109 black hole and has a star formation rate of ∼1500 yr−1. The unprecedented high resolution of the observations reveals a complex morphology of gas within 3 kpc of the accreting central black hole. The gas has a high velocity dispersion with little ordered motion along the line of sight, as would be expected from gas accretion that has yet to settle in a disk. In addition, we find the presence of [C ii] cavities in the gas distribution (with diameters of ∼0.5 kpc), offset from the central black hole. This unique distribution and kinematics cannot be explained by a simple model. Plausible scenarios are that the gas is located in a truncated or warped disk, or the holes are created by interactions with nearby galaxies or due to energy injection into the gas. In the latter case, the energy required to form the cavities must originate from the central active galactic nucleus, as the required energy far exceeds the energy output expected from supernovae. This energy input into the gas, however, does not inhibit the high rate of star formation. Both star formation and black hole activity could have been triggered by interactions with satellite galaxies; our data reveal three additional companions detected in [C ii] emission around the quasar.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/ab11cc