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

MPS-Authors

Decarli,  Roberto
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Walter,  Fabian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Venemans,  Bram P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bañados,  Eduardo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bertoldi,  Frank
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Carilli,  Chris
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fan,  Xiaohui
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Farina,  Emanuele Paolo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mazzucchelli,  Chiara
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Riechers,  Dominik
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rix,  Hans-Walter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Strauss,  Michael A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wang,  Ran
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yang,  Yujin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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Citation

Decarli, R., Walter, F., Venemans, B. P., Bañados, E., Bertoldi, F., Carilli, C., et al. (2018). An ALMA [C II] Survey of 27 Quasars at z > 5.94. The Astrophysical Journal, 854.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CE08-B
Abstract
We present a survey of the [C II] 158 μm line and underlying far- infrared (FIR) dust continuum emission in a sample of 27 z≳ 6 quasars using the Atacama Large Millimeter Array (ALMA) at ̃ 1\prime\prime resolution. The [C II] line was significantly detected (at > 5-σ) in 23 sources (85%). We find typical line luminosities of {L}[{{C}{{II}}]}={10}9-10 {L}, and an average line width of ̃385 {km} {{{s}}}-1. 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 {M}, 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 (> 3× {10}8 {M}, 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.