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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Evidence of Early Enrichment of the Galactic Disk by Large-Scale Winds
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Evidence of Early Enrichment of the Galactic Disk by Large-Scale Winds

机译：大风使银河盘早期富集的证据

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Large-scale homogeneous surveys of Galactic stars may indicate that the elemental abundance gradient evolves with cosmic time, which is a phenomenon that was not foreseen in existing models of Galactic chemical evolution ( GCE). If this phenomenon is confirmed in future studies, we can show that this effect, at least in part, is due to largescale winds that once enriched the disk. These set up a steep abundance gradient in the inner disk (R_(GC) ≤ 14 kpc). At the close of the wind phase, chemical enrichment through accretion of metal-poor material from the halo to the disk gradually reduced the metallicity of the inner region, whereas a slight increase in the metallicity proceeded beyond the solar circle. Our "wind+infall" model accounts for a flattening of the abundance gradient in the inner disk, in agreement with observations. Accordingly, we propose that enrichment by large-scale winds is a crucial factor in chemical evolution in the disk. We anticipate ihat rapid flattening of the abundance gradient is the hallmark of disk galaxies with significant central bulges.
机译：银河系恒星的大规模均匀调查可能表明元素丰度梯度随宇宙时间而演化，这是现有银河系化学演化模型（GCE）中未预见到的现象。如果在以后的研究中证实了这种现象，我们可以证明这种影响至少部分是由于曾经充斥了磁盘的大风所致。这些在内盘上设置了一个陡峭的丰度梯度（R_（GC）≤14 kpc）。在风期结束时，由于贫金属物质从晕圈到圆盘的积聚而引起的化学富集逐渐降低了内部区域的金属性，而金属性的轻微增加则超出了太阳圈。与观察结果一致，我们的“风+入”模型解释了内盘中丰度梯度的展平。因此，我们提出，大风的富集是盘中化学演化的关键因素。我们预计，丰度梯度的快速变平是具有明显中心隆起的盘状星系的标志。

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