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arXiv 2009.14211astro-ph.GA
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MaNGA星系中局域和全局气体金属丰度与恒星年龄的关系

Local and global gas metallicity versus stellar age relation in MaNGA galaxies

Laura Sánchez-Menguiano, Jorge Sánchez Almeida, Casiana Muñoz-Tuñón, Sebastián F. Sánchez

摘要:

寻找联系星系物理性质的新的全局标度关系具有根本的意义。此外,从空间分辨关系中恢复它们一直是积分场光谱学(IFS)的焦点之一。在这项研究中,我们调查之间的恒星年龄($Age_\star$)和气相金属丰度($Z_g$)的存在的全球和本地的关系。为此,我们分析了736恒星形成盘星系的样本MaNGA调查IFS数据。我们报告了全球$Z_g$和$D(4000)$(恒星年龄的指标)之间的正相关性,其斜率随着星系质量的增加而减小。在局部,当分析恒星形成区域的$Z_g$和$D(4000)$,以及去除两个参数的径向梯度后的残差时,发现了类似的趋势。局部律的斜率系统地小于全局律。我们将这种差异归因于随机误差,这使得在执行最小二乘拟合时系统地低估了$Age_\star-Z_g$关系的真实斜率。探索的关系与已知的气体金属丰度和恒星形成率之间的关系密切相关,在固定的质量,都呈现出一个共同的物理起源。

英文摘要:

The search for new global scaling relations linking physical properties of galaxies has a fundamental interest. Furthermore, their recovery from spatially resolved relations has been one of the spotlights of integral field spectroscopy (IFS). In this study we investigate the existence of global and local relations between stellar age ($Age_\star$) and gas-phase metallicity ($Z_g$). To this aim, we analyze IFS data for a sample of 736 star-forming disk galaxies from the MaNGA survey. We report a positive correlation between the global $Z_g$ and $D(4000)$ (an indicator of stellar age), with a slope that decreases with increasing galaxy mass. Locally, a similar trend is found when analyzing the $Z_g$ and $D(4000)$ of the star-forming regions, as well as the residuals resulting from removing the radial gradients of both parameters. The local laws have systematically smaller slopes than the global one. We ascribe this difference to random errors, that make the true slope of the $Age_\star-Z_g$ relation to be systematically underestimated when performing a least square fitting. The explored relation is intimately linked with the already known relation between gas metallicity and star formation rate at fixed mass, both presenting a common physical origin.

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