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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/34243
Title: ALMA 200 pc Imaging of a z 7 Quasar Reveals a Compact, Disk-like Host Galaxy
Authors: Walter, Fabian
Neeleman, Marcel
DECARLI, ROBERTO 
Venemans, Bram
Meyer, Romain
Weiss, Axel
Bañados, Eduardo
Bosman, Sarah E. I.
Carilli, Chris
Fan, Xiaohui
Riechers, Dominik
Rix, Hans-Walter
Thompson, Todd A.
Issue Date: 2022
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 927
Issue: 1
First Page: 21
Abstract: We present 0.″035 resolution (~200 pc) imaging of the 158 μm [C II] line and the underlying dust continuum of the z = 6.9 quasar J234833.34-305410.0. The 18 hour Atacama Large Millimeter/submillimeter Array observations reveal extremely compact emission (diameter ~1 kpc) that is consistent with a simple, almost face-on, rotation-supported disk with a significant velocity dispersion of ~160 km s<SUP>-1</SUP>. The gas mass in just the central 200 pc is ~4 × 10<SUP>9</SUP> M <SUB>⊙</SUB>, about a factor of two higher than that of the central supermassive black hole. Consequently we do not resolve the black hole's sphere of influence, and find no kinematic signature of the central supermassive black hole. Kinematic modeling of the [C II] line shows that the dynamical mass at large radii is consistent with the gas mass, leaving little room for a significant mass contribution by stars and/or dark matter. The Toomre-Q parameter is less than unity throughout the disk, and thus is conducive to star formation, consistent with the high-infrared luminosity of the system. The dust in the central region is optically thick, at a temperature >132 K. Using standard scaling relations of dust heating by star formation, this implies an unprecedented high star formation rate density of >10<SUP>4</SUP> M <SUB>⊙</SUB> yr<SUP>-1</SUP> kpc<SUP>-2</SUP>. Such a high number can still be explained with the Eddington limit for star formation under certain assumptions, but could also imply that the central supermassive black hole contributes to the heating of the dust in the central 200 pc.
URI: http://hdl.handle.net/20.500.12386/34243
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ac49e8
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ac49e8
Bibcode ADS: 2022ApJ...927...21W
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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