SDSS-IV MaNGA: A SERENDIPITOUS OBSERVATION OF A POTENTIAL GAS ACCRETION EVENT
SDSS-IV MaNGA: A SERENDIPITOUS OBSERVATION OF A POTENTIAL GAS ACCRETION EVENT
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DOI：
10.3847/0004-637x/832/2/182
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
Edmond Cheung;D. Stark;Song Huang;K. Rubin;Lihwai Lin;C. Tremonti;Kai Zhang;R. Yan;D. Bizyaev;M. Boquien;J. Brownstein;N. Drory;J. Gelfand;J. Knapen;R. Maiolino;O. Malanushenko;K. Masters;M. Merrifield;Z. Pace;K. Pan;R. Riffel;A. Roman-Lopes;W. Rujopakarn;D. Schneider;J. Stott;D. Thomas;A. Weijmans
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文献类型：
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作者：
Edmond Cheung;D. Stark;Song Huang;K. Rubin;Lihwai Lin;C. Tremonti;Kai Zhang;R. Yan;D. Bizyaev;M. Boquien;J. Brownstein;N. Drory;J. Gelfand;J. Knapen;R. Maiolino;O. Malanushenko;K. Masters;M. Merrifield;Z. Pace;K. Pan;R. Riffel;A. Roman-Lopes;W. Rujopakarn;D. Schneider;J. Stott;D. Thomas;A. Weijmans
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巨大的、不对称的Hα复合体，它没有光学对应物，延伸到一个尘埃、恒星爆发星系的有效半径之外108 ″（16.3 kpc）。这个Hα延伸大约是宿主星系有效半径的三倍，并显示出尾状形态。我们分析了它的气相金属丰度、气体运动学和发射线比，并讨论了这个Hα扩展是否可能是扩散电离气体、气体吸积事件或其他什么。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。
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 Hα complex with no optical counterpart that extends ≈8″ (≈6.3 kpc) beyond the effective radius of a dusty, starbursting galaxy. This Hα 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 Hα 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.