论文标题
气相金属性作为在不同的空间尺度上的恒星形成驱动因素的诊断
Gas-phase Metallicity as a Diagnostic of the Drivers of Star-formation on Different Spatial Scales
论文作者
论文摘要
我们检查了恒星形成率（SFR）和气相金属性$ z $的相关性。我们首先预测SFR，冷气质量和$ Z $将如何随着简单的气体调节器框架中的流入率或星形成效率（SFE）的变化而变化。 $δ{\ rm log} $ sfr和$δ{\ rm log} z $，当以时间变化的流入率（SFE）驱动气体调节器时，被发现是负相关的。然后，我们根据观测值研究$δ{\ rm log} $ ssfr（特定SFR）和$δ{\ rm log} $（o/h）的相关性，基于$ \ sim $ 100 $ 100 pc和银河系尺度，基于两个2-二维光谱调查，并具有两种2-二维光谱调查。在取出了总体质量和径向依赖性之后，这可能反映了流入气体金属性和/或流出质量加载的变化后，我们发现银河系上的$δ{\ rm log} $ ssfr和$δ{\ rm log} $（o/h）在银河系上是负相关的，但是负相关的，但$δ; log} $（o/h）在星系中的$ \ sim $ 100 PC秤上呈正相关。如果我们假设种群之间的变化反映了单个对象的时间变化，则得出结论，恒星形成率的变化主要是由银河量表的时变流入驱动的，并由$ \ sim $ \ sim $ 100 pc量表驱动的SFE驱动。我们建立了一个理论框架，以了解SFR，气体质量和金属性之间的相关性及其可变性，该框架可能会在不同尺度上发现恒星形成的相关物理过程。
We examine the correlations of star formation rate (SFR) and gas-phase metallicity $Z$. We first predict how the SFR, cold gas mass and $Z$ will change with variations in inflow rate or in star-formation efficiency (SFE) in a simple gas-regulator framework. The changes $Δ{\rm log}$SFR and $Δ{\rm log} Z$, are found to be negatively (positively) correlated when driving the gas-regulator with time-varying inflow rate (SFE). We then study the correlation of $Δ{\rm log}$sSFR (specific SFR) and $Δ{\rm log}$(O/H) from observations, at both $\sim$100 pc and galactic scales, based on two 2-dimensional spectroscopic surveys with different spatial resolutions, MAD and MaNGA. After taking out the overall mass and radial dependences, which may reflect changes in inflow gas metallicity and/or outflow mass-loading, we find that $Δ{\rm log}$sSFR and $Δ{\rm log}$(O/H) on galactic are found to be negatively correlated, but $Δ{\rm log}$sSFR and $Δ{\rm log}$(O/H) are positively correlated on $\sim$100 pc scales within galaxies. If we assume that the variations across the population reflect temporal variations in individual objects, we conclude that variations in the star formation rate are primarily driven by time-varying inflow at galactic scales, and driven by time-varying SFE at $\sim$100 pc scales. We build a theoretical framework to understand the correlation between SFR, gas mass and metallicity, as well as their variability, which potentially uncovers the relevant physical processes of star formation at different scales.
