Spatially Resolved Interstellar Medium and Highly Excited Dense Molecular Gas in the Most Luminous Quasar at z = 6.327
AffiliationUniv Arizona, Steward Observ
quasars: individual (J0100+2802)
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationFeige Wang et al 2019 ApJ 880 2
RightsCopyright © 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractAmong more than 200 quasars known at z greater than or similar to 6, only one object, J0100+2802 (z = 6.327), was found hosting a >10(10) M-circle dot 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 R-major = 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-sigma 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 similar to 24 K with a density of n((H2)) = 10(4.5) cm(-3), and a warm component at similar to 224 K with a density of n((H2)) = 10(3.6) cm(-3). We also fit the dust continuum with a graybody model. This indicated that the continuum has either a high dust emissivity beta greater than or similar to 2 or a hot dust temperature T-dust greater than or similar to 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.
VersionFinal published version
SponsorsNational Key R&D Program of China [2016YFA0400703]; National Science Foundation of China [11473004, 11533001, 11721303]; US NSF [AST-1515115]; NASA ADAP [NNX17AF28G]; VLA [VLA/14B-151, VLA/15A-494]; JCMT/SCUBA-2 [M15BI055]