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Copious Amounts of Dust and Gas in a z = 7.5 Quasar Host Galaxy

Venemans, Bram P. and Walter, Fabian and Decarli, Roberto and Bañados, Eduardo and Carilli, Chris and Winters, Jan Martin and Schuster, Karl-Friedrich and da Cunha, Elisabete and Fan, Xiaohui and Farina, Emanuele Paolo and Mazzucchelli, Chiara and Rix, Hans-Walter and Weiss, Axel (2017) Copious Amounts of Dust and Gas in a z = 7.5 Quasar Host Galaxy. Astrophysical Journal Letters, 851 (1). Art. No. L8. ISSN 2041-8213. doi:10.3847/2041-8213/aa943a.

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We present IRAM/NOEMA and JVLA observations of the quasar J1342+0928 at z = 7.54 and report detections of copious amounts of dust and [C II] emission in the interstellar medium (ISM) of its host galaxy. At this redshift, the age of the universe is 690 Myr, about 10% younger than the redshift of the previous quasar record holder. Yet, the ISM of this new quasar host galaxy is significantly enriched by metals, as evidenced by the detection of the [C II] 158 μm cooling line and the underlying far-infrared (FIR) dust continuum emission. To the first order, the FIR properties of this quasar host are similar to those found at a slightly lower redshift (z ~ 6), making this source by far the FIR-brightest galaxy known at z ≳ 7.5. The [C II] emission is spatially unresolved, with an upper limit on the diameter of 7 kpc. Together with the measured FWHM of the [C II] line, this yields a dynamical mass of the host of <1.5 x 10^(11) M⊙. Using standard assumptions about the dust temperature and emissivity, the NOEMA measurements give a dust mass of (0.6-4.3 x 10^8 M⊙. The brightness of the [C II] luminosity, together with the high dust mass, imply active ongoing star formation in the quasar host. Using [C II]–SFR scaling relations, we derive star formation rates of 85–545 M⊙ yr^(−1) in the host, consistent with the values derived from the dust continuum. Indeed, an episode of such past high star formation is needed to explain the presence of ~10^8 M⊙ of dust implied by the observations.

Item Type:Article
Related URLs:
URLURL TypeDescription
Venemans, Bram P.0000-0001-9024-8322
Walter, Fabian0000-0003-4793-7880
Decarli, Roberto0000-0002-2662-8803
Bañados, Eduardo0000-0002-2931-7824
Carilli, Chris0000-0001-6647-3861
da Cunha, Elisabete0000-0001-9759-4797
Fan, Xiaohui0000-0003-3310-0131
Farina, Emanuele Paolo0000-0002-6822-2254
Mazzucchelli, Chiara0000-0002-5941-5214
Rix, Hans-Walter0000-0003-4996-9069
Weiss, Axel0000-0003-4678-3939
Additional Information:© 2017 The American Astronomical Society. Received 2017 August 29; revised 2017 October 13; accepted 2017 October 17; published 2017 December 6. We thank the referee for providing valuable comments and suggestions. B.P.V., F.W., and E.P.F. acknowledge funding through the ERC grant "Cosmic Dawn." Support for R.D. was provided by the DFG priority program 1573 "The physics of the interstellar medium." We thank Amanda Karakas for help with estimating the metal production in stars. We are grateful to the JVLA and NOEMA for providing DDT observations. This work is based on observations carried our under project number E16AH with the IRAM NOEMA Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).
Funding AgencyGrant Number
European Research Council (ERC)Cosmic Dawn
Deutsche Forschungsgemeinschaft (DFG)1573
Institut National des Sciences de l'Univers (INSU)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Max Planck SocietyUNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
Subject Keywords:cosmology: observations – galaxies: active – galaxies: high-redshift – galaxies: ISM
Issue or Number:1
Record Number:CaltechAUTHORS:20171206-110318937
Persistent URL:
Official Citation:Bram P. Venemans et al 2017 ApJL 851 L8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83728
Deposited By: Tony Diaz
Deposited On:07 Dec 2017 00:02
Last Modified:15 Nov 2021 20:13

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