论文标题
SDSS-IV漫画：星系气相金属性梯度在整个质量平面上有所不同
SDSS-IV MaNGA: galaxy gas-phase metallicity gradients vary across the mass-size plane
论文作者
论文摘要
气相丰度和丰度梯度提供了有关过去恒星几代的大量信息，并且是星系发展方式的强大探针。已经研究了星系中的气体丰度梯度作为星系质量和大小的函数，但在整个星系质量平面上都没有被考虑。因此，我们使用从Apo（漫画）光谱调查的附近星系中选择的超过1000个星系的样本研究了整个平面上的气相丰度梯度。我们发现梯度在系统上变化，因此比给定恒星质量处的较大的星系高于$ 10^{10} m _ {\ odot} $，显示较小的梯度。这种大小的行为不能用仪器效应来解释，也不能仅仅反映梯度和形态之间已知趋势的反映。我们探索了这种模式的物理起源的多种可能性，尽管需要进一步的工作来建立坚定的物理解释。
Gas-phase abundances and abundance gradients provide much information on past stellar generations, and are powerful probes of how galaxies evolve. Gas abundance gradients in galaxies have been studied as functions of galaxies' mass and size individually, but have largely not been considered across the galaxy mass--size plane. Thus, we investigate gas-phase abundance gradients across this plane, using a sample of over 1000 galaxies selected from the MApping Nearby Galaxies at APO (MaNGA) spectroscopic survey. We find that gradients vary systematically such that above $10^{10}M_{\odot}$, smaller galaxies display flatter gradients than larger galaxies at a given stellar mass. This mass--size behaviour cannot be explained by instrumental effects, nor is it simply a reflection of known trends between gradients and morphology. We explore multiple possibilities for a physical origin for this pattern, though further work is needed to establish a firm physical interpretation.
