2019ApJ...880....2W -
Astrophys. J., 880, 2-2 (2019/July-3)
Spatially resolved interstellar medium and highly excited dense molecular gas in the most luminous quasar at z = 6.327.
WANG F., WANG R., FAN X., WU X.-B., YANG J., NERI R. and YUE M.
Abstract (from CDS):
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-σ 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 n(H2)_=104.5 cm–3, and a warm component at ∼224 K with a density of n(H2)_=103.6 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.
Abstract Copyright:
© 2019. The American Astronomical Society. All rights reserved.
Journal keyword(s):
cosmology: observations - early universe - galaxies: active - galaxies: high-redshift - quasars: individual: J0100+2802
Simbad objects:
7
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