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arXiv 1609.01740astro-ph.GA
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银河系的全球关系是从局部关系中产生的吗?SDSS IV MaNGA表面质量密度-金属丰度关系

Do galaxy global relationships emerge from local ones? The SDSS IV MaNGA surface mass density-metallicity relation

Jorge K. Barrera-Ballesteros, Timothy M. Heckman, Guangtun B. Zhu, Nadia L. Zakamska, Sebastian F. Sánchez, David Law, David Wake, Jenny E. Green, Dmitry Bizyae… 展开作者

Jorge K. Barrera-Ballesteros, Timothy M. Heckman, Guangtun B. Zhu, Nadia L. Zakamska, Sebastian F. Sánchez, David Law, David Wake, Jenny E. Green, Dmitry Bizyaev, Daniel Oravetz, Audrey Simmons, Elena Malanushenko, Kaike Pan, Alexandre Roman Lopes, Richard R. Lane

摘要:

我们提出了恒星表面质量密度{ \it vs.} SDSS IV MaNGA巡天中包含的653个盘状星系样本中超过50万个空间分辨的恒星形成分辨率元素(spaxels)的气体金属丰度($Σ_*-Z$)关系。我们发现这些本地属性之间的紧密关系,随着表面密度的增加,具有更高的金属。这种关系在表面质量密度上延伸了三个数量级,在金属丰度上延伸了四个数量级。我们发现,这种局部关系可以同时再现盘星系的两个众所周知的属性:它们的全球质量-金属丰度关系{ \it和}它们的径向金属丰度梯度。我们还发现,$Σ_* - Z$关系是在很大程度上独立的星系的总恒星质量和特定的恒星形成率(sSFR),除了在低恒星质量和高sSFR。这些结果表明,在当今的宇宙中,局部性质在决定典型盘星系的气相金属丰度方面起着关键作用。

英文摘要:

We present the stellar surface mass density {\it vs.} gas metallicity ($Σ_*-Z$) relation for more than 500,000 spatially-resolved star-forming resolution elements (spaxels) from a sample of 653 disk galaxies included in the SDSS IV MaNGA survey. We find a tight relation between these local properties, with higher metallicities as the surface density increases. This relation extends over three orders of magnitude in the surface mass density and a factor of four in metallicity. We show that this local relationship can simultaneously reproduce two well-known properties of disk galaxies: their global mass-metallicity relationship {\it and} their radial metallicity gradients. We also find that the $Σ_* - Z$ relation is largely independent of the galaxy's total stellar mass and specific star-formation rate (sSFR), except at low stellar mass and high sSFR. These results suggest that in the present-day universe local properties play a key role in determining the gas-phase metallicity in typical disk galaxies.

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