A warm ultraluminous infrared galaxy just 600 million years after the big bang
Journal article, 2025
We present an Atacama Large Millimeter/submillimeter Array (ALMA) Band 9 continuum detection () of MACS0416_Y1 that confirms the suspected warm dust (91 K) of this Lyman-Break Galaxy (LBG) at with M. A modified blackbody fit to the ALMA Bands 3 through 9 data of MACS0416_Y1 finds an intrinsic infrared luminosity of 1.0, placing this UV-selected LBG in the regime of Ultra Luminous Infrared Galaxies. Its luminous but modest dust reservoir (1.4) is cospatial to regions with a UV-continuum slope as seen by James Webb Space Telescope (JWST) imaging. Although this implies some dust obscuration, the JWST photometry implies less obscured star formation than seen in the complete characterization by ALMA, implying some spatial separation of dust and stars on scales below 200 pc, i.e. smaller than those probed by JWST and ALMA. This source is an extreme example of dust-obscured star formation contributing strongly to the cosmic build-up of stellar mass, which can only be revealed through direct and comprehensive observations in the (sub)mm regime.
infrared: galaxies
galaxies: evolution
dust, extinction
galaxies: formation
galaxies: high-redshift
submillimetre: galaxies
Author
Tom Bakx
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Laura Sommovigo
Flatiron Institute
Y. Tamura
Nagoya University
Renske Smit
Liverpool John Moores University
Andrea Ferrara
Scuola Normale Superiore di Pisa
H. Algera
Academia Sinica
Susanne Aalto
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
D. Bossion
Institut de Physique de Rennes (IPR)
S. Carniani
Scuola Normale Superiore di Pisa
Clarke Jarett Esmerian
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Masato Hagimoto
Nagoya University
Takuya Hashimoto
University of Tsukuba
B. Hatsukade
University of Tokyo
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
E. Ibar
University of Valparaíso
Millenium Nucleus for Galaxies (MINGAL)
H. Inami
Hiroshima University
Akio K. Inoue
Waseda University
Kirsten Knudsen
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
N. Laporte
Laboratoire d'Astrophysique de Marseille
Ken Mawatari
Waseda University
Juan Molina
Millenium Nucleus for Galaxies (MINGAL)
University of Valparaíso
G Nyman
University of Gothenburg
Takashi Okamoto
Hokkaido University
Andrea Pallottini
Scuola Normale Superiore di Pisa
University of Pisa
W. M.C. Sameera
H. Umehata
Nagoya University
Wouter Vlemmings
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Naoki Yoshida
University of Tokyo
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 544 2 1502-1513The Origin and Fate of Dust in Our Universe
Knut and Alice Wallenberg Foundation (KAW 2020.0081), 2021-07-01 -- 2026-06-30.
Knut and Alice Wallenberg Foundation (KAW 2019.0443), 2020-06-01 -- 2023-05-31.
Unravelling the complexity of the reionization history though simulations and multi-wavelength observations (RECAP)
European Commission (EC) (101166930), 2025-06-01 -- 2031-06-30.
Subject Categories (SSIF 2025)
Atom and Molecular Physics and Optics
Astronomy, Astrophysics, and Cosmology
DOI
10.1093/mnras/staf1714