Spatially Resolved Interstellar Medium and Highly Excited Dense Molecular Gas in the Most Luminous Quasar at z = 6.327

Spatially Resolved Interstellar Medium and Highly Excited Dense Molecular Gas in the Most Luminous Quasar at z = 6.327

Among more than 200 quasars known at z 6, only one object, J0100+2802 (z = 6.327), was found hosting a >1010 M supermassive black hole. In order to investigate the host galaxy properties of J0100+2802, we performed multi-band ALMA observations, aiming at mapping the dust continuum, [C ii] and CO(...

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Bibliographic Details
Published in:The Astrophysical journal 2019-07, Vol.880 (1), p.2
Main Authors: Wang, Feige, Wang, Ran, Fan, Xiaohui, Wu, Xue-Bing, Yang, Jinyi, Neri, Roberto, Yue, Minghao
Format: Article
Language:eng
Subjects:
Active galactic nuclei
Astrophysics
Cosmic dust
cosmology: observations
Density
Dust
early universe
Emission
Emission lines
Emission measurements
Emissivity
Energy distribution
Galaxies
galaxies: active
galaxies: high-redshift
Graybody
Interstellar chemistry
Interstellar gas
Interstellar matter
Interstellar medium
Line spectra
Mapping
Molecular gases
Quasars
quasars: individual (J0100+2802)
Supermassive black holes
Temperature
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Summary:Among more than 200 quasars known at z 6, only one object, J0100+2802 (z = 6.327), was found hosting a >1010 M supermassive black hole. In order to investigate the host galaxy properties of J0100+2802, we performed multi-band ALMA observations, aiming at mapping the dust continuum, [C ii] and CO(6-5) emission lines with subkiloparsec scale resolution, as well as detecting high-J CO lines in CO(11-10), CO(10-9), and CO(7-6). The galaxy size is measured to be Rmajor = 3.6 0.2 kpc from the high-resolution continuum observations. No ordered motion on kiloparsec scales was found in either the [C ii] or the CO(6-5) emission. The velocity dispersion is measured to be 161 7 km s−1, which is about three times smaller than that estimated from the local M- relation. In addition, we found that the CO emission is more concentrated (a factor of 1.8 0.4) than the [C ii] emission. Together with CO(2-1) detected by the Very Large Array (VLA), we measured the CO spectral line energy distribution, which is best fit by a two-component model that includes a cool component at ∼24 K with a density of cm−3, and a warm component at ∼224 K with a density of cm−3. We also fit the dust continuum with a graybody model. This indicated that the continuum has either a high dust emissivity β 2 or a hot dust temperature Tdust 60 K, or a combination of these two factors. The highly excited CO emission and hot dust temperature suggest that the powerful active galactic nucleus in J0100+2802 could contribute to the gas and dust heating, but future observations are needed to confirm this.
ISSN:0004-637X
1538-4357