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

Author(s): Decarli, Roberto; Walter, Fabian; Venemans, Bram P; Ba nados, Eduardo; Bertoldi, Frank; et al

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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 resolution. The [C II] line was significantly detected (at >5-σ) in 23 sources (85%). We find typical line luminosities of = - [ ] L L10C 9 10 II , 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.
Publication Date: 15-Feb-2018
Electronic Publication Date: 20-Feb-2018
Citation: Decarli, Roberto, Walter, Fabian, Venemans, Bram P, Ba nados, Eduardo, Bertoldi, Frank, Carilli, Chris, Fan, Xiaohui, Farina, Emanuele Paolo, Mazzucchelli, Chiara, Riechers, Dominik, Rix, Hans-Walter, Strauss, Michael A, Wang, Ran, Yang, Yujin. (2018). An ALMA [C II] Survey of 27 Quasars at z > 5.94. \apj, 854 (97 - 97. doi:10.3847/1538-4357/aaa5aa
DOI: doi:10.3847/1538-4357/aaa5aa
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Type of Material: Journal Article
Journal/Proceeding Title: Astrophysical Journal
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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