见证红色序列的诞生：z = 4.425的两个相互作用的红外恒星爆发中[ CII ]和尘埃的ALMA高分辨率成像
Witnessing the birth of the red sequence: ALMA high-resolution imaging of [CII] and dust in two interacting ultra-red starbursts at z = 4.425
摘要：
利用阿塔卡马大型毫米/亚毫米阵列（ALMA）的灵敏度和空间分辨率，我们研究了SGP 38326中星际介质（包括气体和尘埃）的形态和物理尺度，SGP 38326是$z= 4.425$上的一对无透镜的相互作用的星爆。SGP 38326是$z > 4$已知的最明亮的恒星爆发系统，具有IR衍生的${\rm SFR \sim 4300 \,} M_\odot \, {\rm yr}^{-1}$。Sgp 38326还包含一个分子气体库，是早期宇宙中发现的最大的分子气体库之一，它很可能是$z \sim 3$中一个巨大的红色死亡椭圆星系的前身。探测尺度的$\sim 0.1"$或$\sim 800 \, {\rm pc}$，我们发现，从冷尘埃颗粒的连续发射的平滑分布与更不规则的气体形态形成对比，跟踪的[CII]精细结构的发射。气体也比尘埃延伸到更大的物理尺度。由解析的[CII]发射提供的速度信息表明，SGP 38326的两个分量的动力学与盘状有序旋转是相容的，但也揭示了ISM是湍流和不稳定的。我们的观测结果支持这样一种情况，即至少有一部分最遥远的极端星爆是富含气体的星系的高耗散合并。
英文摘要：
Exploiting the sensitivity and spatial resolution of the Atacama Large Millimeter/submillimeter Array (ALMA), we have studied the morphology and the physical scale of the interstellar medium - both gas and dust - in SGP38326, an unlensed pair of interacting starbursts at $z= 4.425$. SGP38326 is the most luminous star bursting system known at $z > 4$ with an IR-derived ${\rm SFR \sim 4300 \,} M_\odot \, {\rm yr}^{-1}$. SGP38326 also contains a molecular gas reservoir among the most massive ever found in the early Universe, and it is the likely progenitor of a massive, red-and-dead elliptical galaxy at $z \sim 3$. Probing scales of $\sim 0.1"$ or $\sim 800 \, {\rm pc}$ we find that the smooth distribution of the continuum emission from cool dust grains contrasts with the more irregular morphology of the gas, as traced by the [CII] fine structure emission. The gas is also extended over larger physical scales than the dust. The velocity information provided by the resolved [CII] emission reveals that the dynamics of the two components of SGP38326 are compatible with disk-like, ordered rotation, but also reveals an ISM which is turbulent and unstable. Our observations support a scenario where at least a subset of the most distant extreme starbursts are highly dissipative mergers of gas-rich galaxies.
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