Accurate dust temperature determination in a z = 7.13 galaxy
Artikel i vetenskaplig tidskrift, 2021

We report ALMA Band 9 continuum observations of the normal, dusty star-forming galaxy A1689-zD1 at z = 7.13, resulting in a ∼4.6 σ detection at 702 GHz. For the first time, these observations probe the far-infrared spectrum shortward of the emission peak of a galaxy in the Epoch of Reionization (EoR). Together with ancillary data from earlier works, we derive the dust temperature, Td, and mass, Md, of A1689-zD1 using both traditional modified blackbody spectral energy density fitting, and a new method that relies only on the [C ii] 158 μm line and underlying continuum data. The two methods give Td = (42+13-7, 40+13-) K, and Md} = (1.7+1.3-0.7, 2.0+1.8-1.0), ×, 107, M⊙. Band 9 observations improve the accuracy of the dust temperature (mass) estimate by ∼50 per cent (6 times). The derived temperatures confirm the reported increasing Td-redshift trend between z = 0 and 8; the dust mass is consistent with a supernova origin. Although A1689-zD1 is a normal UV-selected galaxy, our results, implying that ∼85 per cent of its star-formation rate is obscured, underline the non-negligible effects of dust in EoR galaxies.

dust, extinction

galaxies: evolution

galaxies: individual: (A1689-zD1)

galaxies: formation

submillimetre: galaxies

galaxies: high-redshift


Tom J.L.C. Bakx

National Astronomical Observatory of Japan

Nagoya University

Laura Sommovigo

Scuola Normale Superiore di Pisa

S. Carniani

Scuola Normale Superiore di Pisa

Andrea Ferrara

Scuola Normale Superiore di Pisa

Hollis B. Akins

Grinnell College

S. Fujimoto

Niels Bohr Institute

Cosmic Dawn Center (DAWN)

Masato Hagimoto

Nagoya University

Kirsten Kraiberg Knudsen

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Andrea Pallottini

Scuola Normale Superiore di Pisa

Y. Tamura

Nagoya University

Darach Watson

Cosmic Dawn Center (DAWN)

Niels Bohr Institute

Monthly Notices of the Royal Astronomical Society: Letters

17453925 (ISSN) 17453933 (eISSN)

Vol. 508 1 L58-L63


Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

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