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arXiv 2212.10751astro-ph.GA
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含TYPHOON的条形镓的金属度梯度

Metallicity Gradient of Barred Galaxies with TYPHOON

Qian-Hui Chen, Kathryn Grasha, Andrew J. Battisti, Lisa J. Kewley, Barry F. Madore, Mark Seibert, Jeff A. Rich, Rachael L. Beaton

摘要:

棒在混合星系内部区域的物质和刺激径向迁移方面起着重要作用。以前的观测已经发现了金属丰度梯度的影响的酒吧的证据,但效果仍然是不确定的。我们使用的台风/PrISM调查调查的金属丰度梯度沿和超越酒吧区域在整个恒星形成盘附近的五个星系。使用发射线图,以确定恒星形成spaxels,我们恢复全球金属丰度梯度范围从-0.0162到-0.073德克斯/千秒差距的证据表明,银河酒吧作为一个代理人在影响原位恒星形成以及气体和恒星的运动。我们观察到的情况下,“浅-陡”的金属丰度径向剖面,与酒吧平坦的金属丰度梯度内的酒吧区(NGC~5068和NGC~1566)的证据,也注意到的情况下,酒吧似乎驱动一个陡峭的金属丰度梯度产生“陡-浅”的金属丰度剖面(NGC~1365和NGC~1744)。对于NGC~2835,“陡-浅”金属丰度梯度突变发生在距离$\sim$ 4倍棒半径处,这更可能是由气体吸积驱动到星系外围而不是棒。棒区金属丰度梯度的变化反映了NGC~1365、NGC~1566和NGC~1744恒星形成率面密度的波动。需要一个更大的样本结合流体动力学模拟,以进一步探索不同的ISM混合机制的多样性和相对重要性的气相金属丰度梯度在本地星系。

英文摘要:

Bars play an important role in mixing material in the inner regions of galaxies and stimulating radial migration. Previous observations have found evidence for the impact of a bar on metallicity gradients but the effect is still inconclusive. We use the TYPHOON/PrISM survey to investigate the metallicity gradients along and beyond the bar region across the entire star-forming disk of five nearby galaxies. Using emission line diagrams to identify star-forming spaxels, we recover the global metallicity gradients ranging from -0.0162 to -0.073 dex/kpc with evidence that the galactic bars act as an agent in affecting in-situ star formation as well as the motions of gas and stars. We observe cases with a `shallow-steep' metallicity radial profile, with evidence of the bar flattening the metallicity gradients inside the bar region (NGC~5068 and NGC~1566) and also note instances where the bar appears to drive a steeper metallicity gradient producing `steep-shallow' metallicity profiles (NGC~1365 and NGC~1744). For NGC~2835, a `steep-shallow' metallicity gradient break occurs at a distance $\sim$ 4 times the bar radius, which is more likely driven by gas accretion to the outskirt of the galaxy instead of the bar. The variation of metallicity gradients around the bar region traces the fluctuations of star formation rate surface density in NGC~1365, NGC~1566 and NGC~1744. A larger sample combined with hydrodynamical simulations is required to further explore the diversity and the relative importance of different ISM mixing mechanisms on the gas-phase metallicity gradients in local galaxies.

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