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

Decarli, Roberto and Walter, Fabian and Venemans, Bram P. and Bañados, Eduardo and Bertoldi, Frank and Carilli, Chris and Fan, Xiaohui and Farina, Emanuele Paolo and Mazzucchelli, Chiara and Riechers, Dominik and Rix, Hans-Walter and Strauss, Michael A. and Wang, Ran and Yang, Yujin (2018) An ALMA [C II] Survey of 27 Quasars at z > 5.94. Astrophysical Journal, 854 (2). Art. No. 97. ISSN 1538-4357. doi:10.3847/1538-4357/aaa5aa.

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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_([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 × 10^(10) and 2 × 10^(11) 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 x 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Decarli, Roberto0000-0002-2662-8803
Walter, Fabian0000-0003-4793-7880
Venemans, Bram P.0000-0001-9024-8322
Bañados, Eduardo0000-0002-2931-7824
Bertoldi, Frank0000-0002-1707-1775
Carilli, Chris0000-0001-6647-3861
Fan, Xiaohui0000-0003-3310-0131
Farina, Emanuele Paolo0000-0002-6822-2254
Mazzucchelli, Chiara0000-0002-5941-5214
Riechers, Dominik0000-0001-9585-1462
Rix, Hans-Walter0000-0003-4996-9069
Strauss, Michael A.0000-0002-0106-7755
Wang, Ran0000-0003-4956-5742
Yang, Yujin0000-0003-3078-2763
Additional Information:© 2018 American Astronomical Society. Received 2017 August 23. Accepted 2018 January 5. Published 2018 February 15. We are grateful to the referee, Prof. Takeuchi, for his helpful comments. We thank Bade Uzgil for insightful discussions. Support for R.D. was provided by the DFG priority program 1573 "The physics of the interstellar medium." F.W., B.P.V., and E.P.F. acknowledge support through ERC grant Cosmic_Dawn. D.R. acknowledges support from the National Science Foundation under grant number AST-1614213 to Cornell University. Facility: ALMA - Atacama Large Millimeter Array data: 2015.1.01115.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)1573
European Research Council (ERC)Cosmic_Dawn
Subject Keywords:galaxies: high-redshift; galaxies: ISM; quasars: emission lines; quasars: general
Issue or Number:2
Record Number:CaltechAUTHORS:20180220-065543228
Persistent URL:
Official Citation:Roberto Decarli et al 2018 ApJ 854 97
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84876
Deposited By: Ruth Sustaita
Deposited On:20 Feb 2018 21:14
Last Modified:15 Nov 2021 20:23

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