An ALMA [C ii] Survey of 27 Quasars at z > 5.94

We present a survey of the [C ii] 158 m line and underlying far-infrared (FIR) dust continuum emission in a sample of 27 quasars using the Atacama Large Millimeter Array (ALMA) at resolution. The [C ii] line was significantly detected (at - ) in 23 sources (85%). We find typical line luminosities of...

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Bibliographic Details
Published in:The Astrophysical journal 2018-02, Vol.854 (2), p.97
Main Authors: Decarli, Roberto, Walter, Fabian, Venemans, Bram P., Bañados, Eduardo, Bertoldi, Frank, Carilli, Chris, Fan, Xiaohui, Farina, Emanuele Paolo, Mazzucchelli, Chiara, Riechers, Dominik, Rix, Hans-Walter, Strauss, Michael A., Wang, Ran, Yang, Yujin
Format: Article
Language:English
Subjects:
Astrophysics
Black holes
Continuum radiation
Deposition
Emission
Emissions
Far infrared radiation
Galaxies
galaxies: high-redshift
galaxies: ISM
Luminosity
Polls & surveys
Quasars
quasars: emission lines
quasars: general
Radio telescopes
Star formation
Wavelengths
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Summary:We present a survey of the [C ii] 158 m line and underlying far-infrared (FIR) dust continuum emission in a sample of 27 quasars using the Atacama Large Millimeter Array (ALMA) at resolution. The [C ii] line was significantly detected (at - ) in 23 sources (85%). We find typical line luminosities of , and an average line width of ∼385 . The [C ii]-to-far-infrared luminosity ratios ([C ii]/FIR) in our sources span one order of magnitude, highlighting a variety of conditions in the star-forming medium. Four quasar host galaxies are clearly resolved in their [C ii] emission on a few kpc scales. Basic estimates of the dynamical masses of the host galaxies give masses between 2 × 1010 and 2 × 1011 , i.e., more than an order of magnitude below what is expected from local scaling relations, given the available limits on the masses of the central black holes ( , assuming Eddington-limited accretion). In stacked ALMA [C ii] spectra of individual sources in our sample, we find no evidence of a deviation from a single Gaussian profile. The quasar luminosity does not strongly correlate with either the [C ii] luminosity or equivalent width. This survey (with typical on-source integration times of 8 minutes) showcases the unparalleled sensitivity of ALMA at millimeter wavelengths, and offers a unique reference sample for the study of the first massive galaxies in the universe.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aaa5aa