发光亚毫米波星系中的子结构形成（FOSSILS）：初始样本与宇宙正午时期尘埃旋涡星系的发现

本研究利用阿塔卡马大型毫米/亚毫米波阵（ALMA）对12个亚毫米波星系进行了高分辨率远红外观测，旨在研究早期大质量星系的子结构形成。研究发现这些星系呈现出多样的形态特征，包括一个可能由潮汐相互作用引发的旋涡星系，以及部分类似于宁静星系的致密结构。

arXiv:2509.20720v2 Announce Type: replace Abstract: High-resolution far-infrared (FIR) observation of submillimeter galaxies (SMGs) is an effective approach to study the formation of substructures in the early epoch of massive galaxies. We present the 870$\mu$m continuum images resolved down to sub-kpc scales for 12 SMGs taken by Atacama Large Millimeter/Submillimeter Array (ALMA) as an initial sample of the FOSSILS Survey. We discovered a wide variety of morphological properties, including a two-arm spiral galaxy at $z=2.5$ possibly induced by a tidal interaction with a minor companion. Nonetheless, about half of the sample exhibit a compact and circular morphology, which is reminiscent of optical morphology of compact quiescent galaxies. Future studies with larger sample and combination of the rest-frame optical images taken by James Webb Space Telescope will shed light on the various evolutionary track of SMGs.