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arXiv 2109.11564astro-ph.GA
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SDSS-IV MaNGA:邻近星系恒星金属丰度的驱动因素

SDSS-IV MaNGA: drivers of stellar metallicity in nearby galaxies

Justus Neumann, Daniel Thomas, Claudia Maraston, Daniel Goddard, Jianhui Lian, Lewis Hill, Helena Domínguez Sánchez, Mariangela Bernardi, Berta Margalef-Bentabo… 展开作者

Justus Neumann, Daniel Thomas, Claudia Maraston, Daniel Goddard, Jianhui Lian, Lewis Hill, Helena Domínguez Sánchez, Mariangela Bernardi, Berta Margalef-Bentabol, Jorge K. Barrera-Ballesteros, Dmitry Bizyaev, Nicholas F. Boardman, Niv Drory, Joseé G. Fernández-Trincado, Richard Lane

摘要:

恒星金属丰度在星系内和星系间的分布是宇宙时间内化学演化的一个极好的遗迹。我们提出了一个详细的分析空间分辨恒星星族的基础上$>2.6$万空间箱从7439个附近的星系在SDSS-IV的MANGA调查。为了解释准确的倾斜校正,我们推导出一个方程的形态依赖的星系倾角的测定。我们的研究超越了众所周知的全球质量-金属丰度关系和径向金属丰度梯度提供了一个统计上合理的探索恒星金属丰度$[Z/H]$,恒星表面质量密度$Σ_\star$和银河系中心距离之间的局部关系在全球质量形态平面。我们发现一个显着的解决质量密度金属丰度关系$\rm rΣ_\star ZR$的所有类型和质量以上$10^{9.8}\,\mathrm{M_\odot}$的星系。不同的径向距离对关系的扩展做出重要贡献。特别是,在低和中等质量的星系,我们发现,在固定的$Σ_\star$金属丰度增加与半径的形态无关。对于高质量,这种径向依赖性只在螺旋星系的高$Σ_\star$区域观察到。这一结果要求除了$Σ_\star$之外,还有一个金属丰度的驱动因素,它促进了星系外部比内部更强烈的化学富集。我们讨论了气体吸积,外流,再循环和径向迁移作为可能的情况。

英文摘要:

The distribution of stellar metallicities within and across galaxies is an excellent relic of the chemical evolution across cosmic time. We present a detailed analysis of spatially resolved stellar populations based on $>2.6$ million spatial bins from 7439 nearby galaxies in the SDSS-IV MaNGA survey. To account for accurate inclination corrections, we derive an equation for morphology dependent determination of galaxy inclinations. Our study goes beyond the well-known global mass-metallicity relation and radial metallicity gradients by providing a statistically sound exploration of local relations between stellar metallicity $[Z/H]$, stellar surface mass density $Σ_\star$ and galactocentric distance in the global mass-morphology plane. We find a significant resolved mass density-metallicity relation $\rm rΣ_\star ZR$ for galaxies of all types and masses above $10^{9.8}\,\mathrm{M_\odot}$. Different radial distances make an important contribution to the spread of the relation. Particularly, in low and intermediate mass galaxies, we find that at fixed $Σ_\star$ metallicity increases with radius independently of morphology. For high masses, this radial dependence is only observed in high $Σ_\star$ regions of spiral galaxies. This result calls for a driver of metallicity, in addition to $Σ_\star$ that promotes chemical enrichment in the outer parts of galaxies more strongly than in the inner parts. We discuss gas accretion, outflows, recycling and radial migration as possible scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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