论文标题
来自金属性 - 恒星质量SFR关系的银河流出的限制Eagle Simulation和SDSS星系
Constraints on galactic outflows from the metallicity-stellar mass-SFR relation of EAGLE simulation and SDSS galaxies
论文作者
论文摘要
恒星反馈驱动的流出调节星系的恒星形成和化学富集，但质量流出速率对星系特性的潜在依赖性仍然很大。我们开发了一个简单而全面的非平衡化学演化模型〜（NE-CEM），以使用SDSS在$ z {=} 0 $上观察到的金属性 - 恒星质量-SFR关系来限制流出的质量加载因子$η$。我们的NE-CEM通过明确跟踪恒星形成和质量负载的历史来预测化学富集。在探索了鹰模拟后，我们发现了一个紧凑而灵活的模型，该模型准确地描述了星系的平均恒星形成历史。我们发现，应用一种新颖的化学测量方法$η$，我们发现$η$可以通过其对恒星质量的依赖性和特定的Sfr进行参数，为$ \logη\ propto m _*^αs{\ mathrm {\ mathrm {sfr}}^β$，并以$α{=} {=} 0.12 $和$β$ n 0.3.2 $ in ee我们的化学提取的$η$与Mitchell等人的运动学测量非常吻合。经过Eagle进行了广泛的测试后，我们将NE-CEM贝叶斯分析应用于SDSS数据，产生了$ \ log（η/0.631）= 0.731 {\ pm} 0.002 \ times（m _*/10^{9.5} {9.5} M _ {\ odot} \ odot} {\ odot}） （s {\ mathrm {sfr}}/10^{ - 9.5} yr^{ - 1}）^{0.078 \ pm0.003} $，与倾斜的测量值非常一致。我们最合适的NE-CEM不仅准确地描述了$ z {=} 0 $的金属性 - 固有质量-SFR关系，而且还成功地重现了较高的红移时所谓的“基本金属关系”。我们的结果表明，不同的星系表明，不同的星系形成了星星，并在非平衡的时尚时代相互融合，并丰富了它们的气体，但相互融合的时尚相互融合。
Stellar feedback-driven outflows regulate the stellar formation and chemical enrichment of galaxies, yet the underlying dependence of mass outflow rate on galaxy properties remains largely unknown. We develop a simple yet comprehensive non-equilibrium chemical evolution model~(NE-CEM) to constrain the mass-loading factor $η$ of outflows using the metallicity-stellar mass-SFR relation observed by SDSS at $z{=}0$. Our NE-CEM predicts the chemical enrichment by explicitly tracking both the histories of star formation and mass-loading. After exploring the EAGLE simulation, we discover a compact yet flexible model that accurately describes the average star formation histories of galaxies. Applying a novel method of chemically measuring $η$ to EAGLE, we find $η$ can be parametrised by its dependence on stellar mass and specific SFR as $\logη\propto M_*^αs{\mathrm{SFR}}^β$, with $α{=}{-}0.12$ and $β{=}0.32$ in EAGLE. Our chemically-inferred $η$ agrees remarkably well with the kinematic measurements by Mitchell et al. After extensive tests with EAGLE, we apply an NE-CEM Bayesian analysis to the SDSS data, yielding a tight constraint of $\log(η/0.631)=0.731{\pm}0.002\times(M_*/10^{9.5}M_{\odot})^{-0.222\pm0.004} (s{\mathrm{SFR}}/10^{-9.5}yr^{-1})^{0.078\pm0.003}$, in good agreement with the down-the-barrel measurements. Our best-fitting NE-CEM not only accurately describes the metallicity-stellar mass-SFR relation at $z{=}0$, but also successfully reproduce the so-called "fundamental metallicity relation'' at higher redshifts. Our results reveal that different galaxies form stars and enrich their gas in a non-equilibrium but strikingly coherent fashion across cosmic time.
