The ALMA-CRISTAL survey: Widespread dust-obscured star formation in typical star-forming galaxies at z=4-6
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arXiv
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2023
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| author | Mitsuhashi, Ikki Tadaki, Ken-ichi Ikeda, Ryota Herrera-Camus, Rodrigo Aravena, Manuel De Looze, Ilse Schreiber, Natascha M. Förster González-López, Jorge Spilker, Justin Assef, Roberto J. Bouwens, Rychard Barcos-Munoz, Loreto Birkin, Jack Bowler, Rebecca A. A. Rivera, Gabriela Calistro Davies, Rebecca Da Cunha, Elisabete Díaz-Santos, Tanio Ferrara, Andrea Fisher, Deanne Lee, Lilian L. Li, Juno Lutz, Dieter Relaño, Monica Naab, Thorsten Palla, Marco Posses, Ana Solimano, Manuel Tacconi, Linda Übler, Hannah van der Giessen, Stefan Veilleux, Sylvain |
| author_facet | Mitsuhashi, Ikki Tadaki, Ken-ichi Ikeda, Ryota Herrera-Camus, Rodrigo Aravena, Manuel De Looze, Ilse Schreiber, Natascha M. Förster González-López, Jorge Spilker, Justin Assef, Roberto J. Bouwens, Rychard Barcos-Munoz, Loreto Birkin, Jack Bowler, Rebecca A. A. Rivera, Gabriela Calistro Davies, Rebecca Da Cunha, Elisabete Díaz-Santos, Tanio Ferrara, Andrea Fisher, Deanne Lee, Lilian L. Li, Juno Lutz, Dieter Relaño, Monica Naab, Thorsten Palla, Marco Posses, Ana Solimano, Manuel Tacconi, Linda Übler, Hannah van der Giessen, Stefan Veilleux, Sylvain |
| contents | 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 six galaxies from archival data, we have individually detected rest-frame 158$μ$m dust continuum emission from 19 galaxies, nine of which are reported for the first time. The derived far-infrared luminosities are in the range $\log_{10} L_{\rm IR}\,[L_{\odot}]=$10.9-12.4, an order of magnitude lower than previously detected massive dusty star-forming galaxies (DSFGs). The average relationship between the fraction of dust-obscured star formation ($f_{\rm obs}$) and the stellar mass is consistent with previous results at z=4-6 in a mass range of $\log_{10} M_{\ast}\,[M_{\odot}]\sim$9.5-11.0 and show potential evolution from z=6-9. The individual $f_{\rm obs}$ exhibits a significant diversity, and it shows a correlation with the spatial offset between the dust and the UV continuum, suggesting the inhomogeneous dust reddening may cause the source-to-source scatter in $f_{\rm obs}$. The effective radii of the dust emission are on average $\sim$1.5 kpc and are $\sim2$ times more extended than the rest-frame UV. The infrared surface densities of these galaxies ($Σ_{\rm IR}\sim2.0\times10^{10}\,L_{\odot}\,{\rm kpc}^{-2}$) 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_17671 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The ALMA-CRISTAL survey: Widespread dust-obscured star formation in typical star-forming galaxies at z=4-6 Mitsuhashi, Ikki Tadaki, Ken-ichi Ikeda, Ryota Herrera-Camus, Rodrigo Aravena, Manuel De Looze, Ilse Schreiber, Natascha M. Förster González-López, Jorge Spilker, Justin Assef, Roberto J. Bouwens, Rychard Barcos-Munoz, Loreto Birkin, Jack Bowler, Rebecca A. A. Rivera, Gabriela Calistro Davies, Rebecca Da Cunha, Elisabete Díaz-Santos, Tanio Ferrara, Andrea Fisher, Deanne Lee, Lilian L. Li, Juno Lutz, Dieter Relaño, Monica Naab, Thorsten Palla, Marco Posses, Ana Solimano, Manuel Tacconi, Linda Übler, Hannah van der Giessen, Stefan Veilleux, Sylvain Astrophysics of Galaxies 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 six galaxies from archival data, we have individually detected rest-frame 158$μ$m dust continuum emission from 19 galaxies, nine of which are reported for the first time. The derived far-infrared luminosities are in the range $\log_{10} L_{\rm IR}\,[L_{\odot}]=$10.9-12.4, an order of magnitude lower than previously detected massive dusty star-forming galaxies (DSFGs). The average relationship between the fraction of dust-obscured star formation ($f_{\rm obs}$) and the stellar mass is consistent with previous results at z=4-6 in a mass range of $\log_{10} M_{\ast}\,[M_{\odot}]\sim$9.5-11.0 and show potential evolution from z=6-9. The individual $f_{\rm obs}$ exhibits a significant diversity, and it shows a correlation with the spatial offset between the dust and the UV continuum, suggesting the inhomogeneous dust reddening may cause the source-to-source scatter in $f_{\rm obs}$. The effective radii of the dust emission are on average $\sim$1.5 kpc and are $\sim2$ times more extended than the rest-frame UV. The infrared surface densities of these galaxies ($Σ_{\rm IR}\sim2.0\times10^{10}\,L_{\odot}\,{\rm kpc}^{-2}$) 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. |
| title | The ALMA-CRISTAL survey: Widespread dust-obscured star formation in typical star-forming galaxies at z=4-6 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2311.17671 |