Accurate dust temperature determination in a z = 7.13 galaxy
Journal article, 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
Author
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, Space, Earth and Environment, Astronomy and Plasmaphysics
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-L63Subject Categories
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1093/mnrasl/slab104