A warm ultra-luminous infrared galaxy just 600 million years after the Big Bang
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2025
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| author | Bakx, T. J. L. C. Sommovigo, Laura Tamura, Yoichi Smit, Renske Ferrara, Andrea Algera, Hiddo Aalto, Susanne Bossion, Duncan Carniani, Stefano Esmerian, Clarke Hagimoto, Masato Hashimoto, Takuya Hatsukade, Bunyo Ibar, Edo Inami, Hanae Inoue, Akio K. Knudsen, Kirsten Laporte, Nicolas Mawatari, Ken Molina, Juan Nyman, Gunnar Okamoto, Takashi Pallottini, Andrea Sameera, W. M. C. Umehata, Hideki Vlemmings, Wouter Yoshida, Naoki |
| author_facet | Bakx, T. J. L. C. Sommovigo, Laura Tamura, Yoichi Smit, Renske Ferrara, Andrea Algera, Hiddo Aalto, Susanne Bossion, Duncan Carniani, Stefano Esmerian, Clarke Hagimoto, Masato Hashimoto, Takuya Hatsukade, Bunyo Ibar, Edo Inami, Hanae Inoue, Akio K. Knudsen, Kirsten Laporte, Nicolas Mawatari, Ken Molina, Juan Nyman, Gunnar Okamoto, Takashi Pallottini, Andrea Sameera, W. M. C. Umehata, Hideki Vlemmings, Wouter Yoshida, Naoki |
| contents | We present an Atacama Large Millimeter/submillimeter Array (ALMA) Band 9 continuum detection ($3.3 σ$) of MACS0416_Y1 that confirms the suspected warm dust (91$^{+62}_{-35}$ K) of this Lyman-Break Galaxy (LBG) at $z = 8.3$ with $\log_{10} M_{\ast}/$M$_{\odot} = 9.0 \pm 0.1$. A modified black-body fit to the ALMA Bands 3 through 9 data of MACS0416_Y1 finds an intrinsic infrared luminosity of 1.0$^{+1.8}_{-0.6} \times{} 10^{12}\ \mathrm{L_{\odot}}$, placing this UV-selected LBG in the regime of Ultra Luminous Infrared Galaxies (ULIRGs). Its luminous but modest dust reservoir (1.4$^{+1.3}_{-0.5} \times{} 10^{6}\ \mathrm{M_{\odot}}$) is co-spatial to regions with a UV-continuum slope $β_{\rm UV} \approx -1.5$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_08327 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A warm ultra-luminous infrared galaxy just 600 million years after the Big Bang Bakx, T. J. L. C. Sommovigo, Laura Tamura, Yoichi Smit, Renske Ferrara, Andrea Algera, Hiddo Aalto, Susanne Bossion, Duncan Carniani, Stefano Esmerian, Clarke Hagimoto, Masato Hashimoto, Takuya Hatsukade, Bunyo Ibar, Edo Inami, Hanae Inoue, Akio K. Knudsen, Kirsten Laporte, Nicolas Mawatari, Ken Molina, Juan Nyman, Gunnar Okamoto, Takashi Pallottini, Andrea Sameera, W. M. C. Umehata, Hideki Vlemmings, Wouter Yoshida, Naoki Astrophysics of Galaxies We present an Atacama Large Millimeter/submillimeter Array (ALMA) Band 9 continuum detection ($3.3 σ$) of MACS0416_Y1 that confirms the suspected warm dust (91$^{+62}_{-35}$ K) of this Lyman-Break Galaxy (LBG) at $z = 8.3$ with $\log_{10} M_{\ast}/$M$_{\odot} = 9.0 \pm 0.1$. A modified black-body fit to the ALMA Bands 3 through 9 data of MACS0416_Y1 finds an intrinsic infrared luminosity of 1.0$^{+1.8}_{-0.6} \times{} 10^{12}\ \mathrm{L_{\odot}}$, placing this UV-selected LBG in the regime of Ultra Luminous Infrared Galaxies (ULIRGs). Its luminous but modest dust reservoir (1.4$^{+1.3}_{-0.5} \times{} 10^{6}\ \mathrm{M_{\odot}}$) is co-spatial to regions with a UV-continuum slope $β_{\rm UV} \approx -1.5$ 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. |
| title | A warm ultra-luminous infrared galaxy just 600 million years after the Big Bang |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2511.08327 |