Formation Of Sub-Structure In Luminous Submillimeter galaxies (FOSSILS): Evidence of Multiple Pathways to Trigger Starbursts in Luminous Submillimeter Galaxies
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909860555128832 |
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| author | Ikeda, Ryota Iono, Daisuke Tadaki, Ken-ichi Franco, Maximilien Yun, Min S. Zavala, Jorge A. Tamura, Yoichi Tsukui, Takafumi Williams, Christina C. Hatsukade, Bunyo Lee, Minju M. Michiyama, Tomonari Mitsuhashi, Ikki Nakanishi, Kouichiro Casey, Caitlin M. Ikarashi, Soh Lee, Kianhong Matsuda, Yuichi Saito, Toshiki Silva, Andrea Umehata, Hideki Yajima, Hidenobu |
| author_facet | Ikeda, Ryota Iono, Daisuke Tadaki, Ken-ichi Franco, Maximilien Yun, Min S. Zavala, Jorge A. Tamura, Yoichi Tsukui, Takafumi Williams, Christina C. Hatsukade, Bunyo Lee, Minju M. Michiyama, Tomonari Mitsuhashi, Ikki Nakanishi, Kouichiro Casey, Caitlin M. Ikarashi, Soh Lee, Kianhong Matsuda, Yuichi Saito, Toshiki Silva, Andrea Umehata, Hideki Yajima, Hidenobu |
| contents | We present an analysis of rest-frame optical and far-infrared continuum emission in three luminous submillimeter galaxies (SMGs) at $3.0\lesssim z\lesssim4.5$. The SMGs are spatially resolved down to 400-500 pc ($\sim0.05$'') resolution by James Webb Space telescope (JWST) and Atacama Large Millimeter/submillimeter Array (ALMA) observations. Despite similarities in their observed far-infrared properties (flux density, infrared luminosity, and effective radius), the three SMGs exhibit heterogeneous morphologies both across wavelengths and among the sources themselves. While two of them (AzTEC-4 and AzTEC-8) show a disk-like structure in optical continuum, AzTEC-1 is dominated by highly concentrated component with the Sérsic index of $n=5.4$, where its far-infrared continuum emission is clumpy and less concentrated. AzTEC-4, which is confirmed to be at $z=4.198$, shows a two-arm spiral of dust, but not in the stellar distribution. These three SMGs exemplify that multiple physical mechanisms exist in triggering starbursts in luminous SMGs at high redshift: secular instability in gas disks (AzTEC-4) in addition to possible minor mergers (AzTEC-8), and a combination of the efficient gas supply to the central core induced by a gas-rich major merger and the reformation of cold gas disk (AzTEC-1). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_18006 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Formation Of Sub-Structure In Luminous Submillimeter galaxies (FOSSILS): Evidence of Multiple Pathways to Trigger Starbursts in Luminous Submillimeter Galaxies Ikeda, Ryota Iono, Daisuke Tadaki, Ken-ichi Franco, Maximilien Yun, Min S. Zavala, Jorge A. Tamura, Yoichi Tsukui, Takafumi Williams, Christina C. Hatsukade, Bunyo Lee, Minju M. Michiyama, Tomonari Mitsuhashi, Ikki Nakanishi, Kouichiro Casey, Caitlin M. Ikarashi, Soh Lee, Kianhong Matsuda, Yuichi Saito, Toshiki Silva, Andrea Umehata, Hideki Yajima, Hidenobu Astrophysics of Galaxies We present an analysis of rest-frame optical and far-infrared continuum emission in three luminous submillimeter galaxies (SMGs) at $3.0\lesssim z\lesssim4.5$. The SMGs are spatially resolved down to 400-500 pc ($\sim0.05$'') resolution by James Webb Space telescope (JWST) and Atacama Large Millimeter/submillimeter Array (ALMA) observations. Despite similarities in their observed far-infrared properties (flux density, infrared luminosity, and effective radius), the three SMGs exhibit heterogeneous morphologies both across wavelengths and among the sources themselves. While two of them (AzTEC-4 and AzTEC-8) show a disk-like structure in optical continuum, AzTEC-1 is dominated by highly concentrated component with the Sérsic index of $n=5.4$, where its far-infrared continuum emission is clumpy and less concentrated. AzTEC-4, which is confirmed to be at $z=4.198$, shows a two-arm spiral of dust, but not in the stellar distribution. These three SMGs exemplify that multiple physical mechanisms exist in triggering starbursts in luminous SMGs at high redshift: secular instability in gas disks (AzTEC-4) in addition to possible minor mergers (AzTEC-8), and a combination of the efficient gas supply to the central core induced by a gas-rich major merger and the reformation of cold gas disk (AzTEC-1). |
| title | Formation Of Sub-Structure In Luminous Submillimeter galaxies (FOSSILS): Evidence of Multiple Pathways to Trigger Starbursts in Luminous Submillimeter Galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.18006 |