论文标题
[CII]高山星系中的光晕：银河流出的吸烟？
[CII] halos in ALPINE galaxies: smoking-gun of galactic outflows?
论文作者
论文摘要
阿尔玛（Alma）的观察结果表明，许多高红移星系被延长（10-15 kpc）[CII]发出的光环包围，即使是最先进的缩放模拟也无法预测。使用半分析模型，在先前的工作中，我们建议这样的光晕是由Starburst驱动的灾难性冷却流出产生的。在这里，我们进一步改进了模型，并将其预测与从7个星形成的数据进行比较（$ 10 \ lyssim \ rm sfr/ m_ \ odot \ rm yr^{ - 1} <100 $）星系在z = 4-6时，在高山调查中观察到。我们发现（a）检测到的[CII]光环是Starburst驱动的流量的天然副产品； （b）流出质量负载因子在$ 4 \lyssimη\ Lessim 7 $的范围内，低质量，下sfr系统的$η$值较高，并且具有恒星质量为$η\ propto m _*^{ - 0.43} $，并始终使用Momentum-driend-driendion-driventiventiventiventiventiven的假设。我们的模型表明，流出是高Z星系中普遍存在的现象。但是，在低质量系统中，晕圈扩展[CII]发射可能太微弱，无法通过当前灵敏度水平检测到。
ALMA observations have revealed that many high redshift galaxies are surrounded by extended (10-15 kpc) [CII]-emitting halos which are not predicted by even the most advanced zoom-in simulations. Using a semi-analytical model, in a previous work we suggested that such halos are produced by starburst-driven, catastrophically cooling outflows. Here, we further improve the model and compare its predictions with data from 7 star-forming ($10\lesssim \rm SFR/ M_\odot \rm yr^{-1}<100$) galaxies at z=4-6, observed in the ALPINE survey. We find that (a) detected [CII] halos are a natural by-product of starburst-driven outflows; (b) the outflow mass loading factors are in the range $4\lesssimη\lesssim 7$, with higher $η$ values for lower-mass, lower-SFR systems, and scale with stellar mass as $η\propto M_*^{-0.43}$, consistently with the momentum-driven hypothesis. Our model suggests that outflows are widespread phenomena in high-z galaxies. However, in low-mass systems the halo extended [CII] emission is likely too faint to be detected with the current levels of sensitivity.
