The Origin of Double-peaked Narrow Lines in Active Galactic Nuclei. IV. Association with Galaxy Mergers
The Origin of Double-peaked Narrow Lines in Active Galactic Nuclei. IV. Association with Galaxy Mergers
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DOI：
10.3847/1538-4357/aae2b4
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发表时间：
2018-10
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影响因子：
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通讯作者：
J. Comerford;R. Nevin;A. Stemo;F. Müller-Sánchez;F. Müller-Sánchez;R. Barrows;M. Cooper;J. Newman-J.
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文献类型：
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作者：
J. Comerford;R. Nevin;A. Stemo;F. Müller-Sánchez;F. Müller-Sánchez;R. Barrows;M. Cooper;J. Newman-J.
活动星系核（AGN）光谱中的双峰窄发射线可以由活动星系核流出、旋转或双活动星系核（AGN对）产生。因此，双峰窄AGN发射线是有用的示踪剂的星系和超大质量黑洞的共同演化，由AGN反馈和AGN燃料驱动。我们进一步研究这个概念，后续的光学长缝观测的样本95斯隆数字巡天（SDSS）星系，有双峰窄AGN发射线。基于长缝谱的运动学分析，我们证实了以前的工作，发现大多数双峰窄AGN发射线与外流。我们还发现，其中8个星系的伴星系的视速度间隔<500 km s−1，物理间隔<30 kpc。由于我们在这两个星系中都发现了活动星系核的证据，因此这八个系统都是引人注目的双重活动星系核候选者。具有双峰窄AGN发射线的星系团在这种星系合并中出现的频率至少是典型活动星系的两倍。最后，我们得出结论，至少有3%的SDSS星系的双峰窄AGN发射线被发现在星系合并，这两个星系在SDSS成像解决。
Double-peaked narrow emission lines in active galactic nucleus (AGN) spectra can be produced by AGN outflows, rotation, or dual AGNs, which are AGN pairs in ongoing galaxy mergers. Consequently, double-peaked narrow AGN emission lines are useful tracers of the coevolution of galaxies and their supermassive black holes, as driven by AGN feedback and AGN fueling. We investigate this concept further with follow-up optical longslit observations of a sample of 95 Sloan Digital Sky Survey (SDSS) galaxies that have double-peaked narrow AGN emission lines. Based on a kinematic analysis of the longslit spectra, we confirm previous work that finds that the majority of double-peaked narrow AGN emission lines are associated with outflows. We also find that eight of the galaxies have companion galaxies with line-of-sight velocity separations <500 km s−1 and physical separations <30 kpc. Since we find evidence of AGNs in both galaxies, all eight of these systems are compelling dual AGN candidates. Galaxies with double-peaked narrow AGN emission lines occur in such galaxy mergers at least twice as often as typical active galaxies. Finally, we conclude that at least 3% of SDSS galaxies with double-peaked narrow AGN emission lines are found in galaxy mergers where both galaxies are resolved in SDSS imaging.