The ALMA-CRISTAL survey

We present the morphological parameters and global properties of dust-obscured star formation in typical star-forming galaxies at z = 4–6. Among 26 galaxies composed of 20 galaxies observed by the Cycle-8 ALMA Large Program, CRISTAL, and 6 galaxies from archival data, we individually detect rest-frame 158 μm dust continuum emission from 19 galaxies, 9 of which are reported for the first time. The derived far-infrared luminosities are in the range log 10 L IR [ L ⊙ ] = 10.9 − 12.4, an order of magnitude lower than previously detected massive dusty star-forming galaxies (DSFGs). We find the average relationship between the fraction of dust-obscured star formation ( f obs ) and the stellar mass to be consistent with previous results at z = 4–6 in a mass range of log 10 M * [ M ⊙ ]∼9.5 − 11.0 and to show potential evolution from z = 6 − 9. The individual f obs exhibits significant diversity, and we find a potential correlation with the spatial offset between the dust and UV continuum, suggesting that inhomogeneous dust reddening may cause the source-to-source scatter in f obs . The effective radii of the dust emission are on average ∼1.5 kpc and are about two times more extended than those seen in rest-frame UV. The infrared surface densities of these galaxies (Σ IR ∼ 2.0 × 10 10 L ⊙ kpc −2 ) are one order of magnitude lower than those of DSFGs that host compact central starbursts. On the basis of the comparable contribution of dust-obscured and dust-unobscured star formation along with their similar spatial extent, we suggest that typical star-forming galaxies at z = 4 − 6 form stars throughout the entirety of their disks.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2024-10-01
DOI
https://doi.org/10.1051/0004-6361/202348782
Citations
24
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
7.96

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article

The ALMA-CRISTAL survey

Ilse De Looze, M. Relaño, Thorsten Naab, G. Calistro Rivera et al.
24 citations
Astronomy and Astrophysics
Galaxies: Formation, Evolution, Phenomena
7.96
article

The ALMA-CRISTAL survey

Ilse De Looze, M. Relaño, Thorsten Naab, G. Calistro Rivera, Andrea Ferrara, Jorge González-López, Roberto J. Assef, Sylvain Veilleux, Ken-ichi Tadaki, Marco Palla, Rodrigo Herrera-Camus, Lilian L. Lee, David B. Fisher, Ikki Mitsuhashi, Jack E. Birkin, D. Lutz, Manuel Solimano, Hannah Übler, Justin Spilker, R. L. Davies, R. A. A. Bowler, Ryota Ikeda, Ana Posses, Elisabete da Cunha, Manuel Aravena, Juno Li, L. J. Tacconi, T. Díaz-Santos, N. M. Förster Schreiber, Stefan van der Giessen, Rychard Bouwens, Loreto Barcos-Muñoz
article en
24 citations

Abstract

We present the morphological parameters and global properties of dust-obscured star formation in typical star-forming galaxies at z = 4–6. Among 26 galaxies composed of 20 galaxies observed by the Cycle-8 ALMA Large Program, CRISTAL, and 6 galaxies from archival data, we individually detect rest-frame 158 μm dust continuum emission from 19 galaxies, 9 of which are reported for the first time. The derived far-infrared luminosities are in the range log 10 L IR [ L ⊙ ] = 10.9 − 12.4, an order of magnitude lower than previously detected massive dusty star-forming galaxies (DSFGs). We find the average relationship between the fraction of dust-obscured star formation ( f obs ) and the stellar mass to be consistent with previous results at z = 4–6 in a mass range of log 10 M * [ M ⊙ ]∼9.5 − 11.0 and to show potential evolution from z = 6 − 9. The individual f obs exhibits significant diversity, and we find a potential correlation with the spatial offset between the dust and UV continuum, suggesting that inhomogeneous dust reddening may cause the source-to-source scatter in f obs . The effective radii of the dust emission are on average ∼1.5 kpc and are about two times more extended than those seen in rest-frame UV. The infrared surface densities of these galaxies (Σ IR ∼ 2.0 × 10 10 L ⊙ kpc −2 ) are one order of magnitude lower than those of DSFGs that host compact central starbursts. On the basis of the comparable contribution of dust-obscured and dust-unobscured star formation along with their similar spatial extent, we suggest that typical star-forming galaxies at z = 4 − 6 form stars throughout the entirety of their disks.

Astronomy and AstrophysicsVol. 690
Leiden University (NL), European Southern Observatory (DE), Scuola Normale Superiore (IT), University of Concepción (CL), Universidad de Granada (ES), The University of Western Australia (AU), Carnegie Institution for Science (US), The Graduate University for Advanced Studies, SOKENDAI (JP), University of Cambridge (GB), National Radio Astronomy Observatory (US), Mitchell Institute (US), University of Manchester (GB), Ghent University (BE), ASTRO-3D (AU), Max Planck Institute for Extraterrestrial Physics (DE), Max Planck Institute for Astrophysics (DE), McCormick (United States) (US), Joint Space Science Institute (US), Carnegie Observatories (US), Las Campanas Observatory (CL), ARC Centre of Excellence for All-sky Astrophysics (AU), National Astronomical Observatory of Japan (JP), International Centre for Radio Astronomy Research (AU), National Astronomical Observatories (CN), Osservatorio di Astrofisica e Scienza dello Spazio, University College London (GB), University of Virginia (US), Swinburne University of Technology (AU), University of Maryland, College Park (US), The University of Tokyo (JP), Foundation for Research and Technology Hellas (GR), Texas A&M University (US), Universidad Diego Portales (CL), Hokkai Gakuen University (JP)
Deutsche Forschungsgemeinschaft, Science and Technology Facilities Council, Japan Society for the Promotion of Science
Openalex Percentile: Top 2%
Galaxies: Formation, Evolution, Phenomena
7.96
DOIOpen Access PDFOpenAlex
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