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arXiv 1609.02155astro-ph.GA
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SDSS-IV MaNGA:对潜在气体吸积事件的偶然观测

SDSS-IV MaNGA: A serendipitous observation of a potential gas accretion event

Edmond Cheung, David V. Stark, Song Huang, Kate H. R. Rubin, Lihwai Lin, Christy Tremonti, Kai Zhang, Renbin Yan, Dmitry Bizyaev, Médéric Boquien, Joel R. Brown… 展开作者

Edmond Cheung, David V. Stark, Song Huang, Kate H. R. Rubin, Lihwai Lin, Christy Tremonti, Kai Zhang, Renbin Yan, Dmitry Bizyaev, Médéric Boquien, Joel R. Brownstein, Niv Drory, Joseph D. Gelfand, Johan H. Knapen, Roberto Maiolino, Olena Malanushenko, Karen L. Masters, Michael R. Merrifield, Zach Pace, Kaike Pan, Rogemar A. Riffel, Alexandre Roman-Lopes, Wiphu Rujopakarn, Donald P. Schneider, John P. Stott, Daniel Thomas, Anne-Marie Weijmans

摘要:

星系外温暖的电离气体的性质可能会阐明几个关键的星系演化过程。MaNGA巡天的一次偶然观测揭示了一个大的、不对称的H $α$复合体,它没有光学对应物,使$\approx8"$($\approx6.3$ kpc)超出了一个尘埃星爆星系的有效半径。这个H $α$的延伸大约是宿主星系有效半径的三倍,并显示出类似尾巴的形态。我们分析了它的气相金属丰度,气体运动学和发射线比,并讨论是否这个H $α$扩展可能是扩散电离气体,气体吸积事件,或其他东西。我们发现,这种温暖的,电离的气体结构是最一致的气体吸积通过回收风材料,这可能是一个重要的过程,调节低质量端的星系恒星质量函数。

英文摘要:

The nature of warm, ionized gas outside of galaxies may illuminate several key galaxy evolutionary processes. A serendipitous observation by the MaNGA survey has revealed a large, asymmetric H$α$ complex with no optical counterpart that extends $\approx8"$ ($\approx6.3$ kpc) beyond the effective radius of a dusty, starbursting galaxy. This H$α$ extension is approximately three times the effective radius of the host galaxy and displays a tail-like morphology. We analyze its gas-phase metallicities, gaseous kinematics, and emission-line ratios, and discuss whether this H$α$ extension could be diffuse ionized gas, a gas accretion event, or something else. We find that this warm, ionized gas structure is most consistent with gas accretion through recycled wind material, which could be an important process that regulates the low-mass end of the galaxy stellar mass function.

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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