双峰窄线活动星系核中千秒差距尺度的空间偏移。I.选择强有力的双活动星系核候选者的标记
Kiloparsec-scale Spatial Offsets in Double-peaked Narrow-line Active Galactic Nuclei. I. Markers for Selection of Compelling Dual Active Galactic Nucleus Candidates
摘要：
具有kpc尺度分离的双活动星系核（AGN）的合并残余星系应该是广泛存在的，这是星系合并和触发气体吸积到超大质量黑洞上的结果，但很少观察到双活动星系核。斯隆数字巡天中具有双峰窄活动星系核发射线的星系核是可能的双重活动星系核候选者，但它们的双峰轮廓也可能是气体运动学或活动星系核驱动的流出和喷流在小或大尺度上的结果。为了区分这两种情况，我们利用Lick、Palomar和MMT天文台对SDSS中81个双峰窄线活动星系核在0.03 < z < 0.36处进行了长缝光谱观测，获得了活动星系核辐射的空间分布。我们发现，所有81个系统都表现出双活动星系核的发射分量与~kpc的投影空间分离的天空，这表明他们是由kpc尺度的双重活动星系核或kpc尺度的外流，喷流，或旋转的气体盘。此外，我们发现，子样本（58%）的对象与空间紧凑的发射成分可能优先产生的双重活动星系核，而子样本（42%）的空间扩展的发射成分可能优先产生的活动星系核流出。我们还发现，对于32%的样本的两个活动星系核的发射组件优先与宿主星系主轴对齐，预期的双活动星系核在宿主星系的潜在轨道。我们的研究结果既缩小了产生双重活动星系核成分的可能物理机制的列表，并提出了从双峰窄线活动星系核的完整样本中选择最有希望的双重活动星系核候选者的几个观测标准。使用这些标准，我们确定了17个最引人注目的双重活动星系核候选者在我们的样本。
英文摘要：
Merger-remnant galaxies with kpc-scale separation dual active galactic nuclei (AGNs) should be widespread as a consequence of galaxy mergers and triggered gas accretion onto supermassive black holes, yet very few dual AGNs have been observed. Galaxies with double-peaked narrow AGN emission lines in the Sloan Digital Sky Survey are plausible dual AGN candidates, but their double-peaked profiles could also be the result of gas kinematics or AGN-driven outflows and jets on small or large scales. To help distinguish between these scenarios, we have obtained spatial profiles of the AGN emission via follow-up long-slit spectroscopy of 81 double-peaked narrow-line AGNs in SDSS at 0.03 < z < 0.36 using Lick, Palomar, and MMT Observatories. We find that all 81 systems exhibit double AGN emission components with ~kpc projected spatial separations on the sky, which suggests that they are produced by kpc-scale dual AGNs or kpc-scale outflows, jets, or rotating gaseous disks. In addition, we find that the subsample (58%) of the objects with spatially compact emission components may be preferentially produced by dual AGNs, while the subsample (42%) with spatially extended emission components may be preferentially produced by AGN outflows. We also find that for 32% of the sample the two AGN emission components are preferentially aligned with the host galaxy major axis, as expected for dual AGNs orbiting in the host galaxy potential. Our results both narrow the list of possible physical mechanisms producing the double AGN components, and suggest several observational criteria for selecting the most promising dual AGN candidates from the full sample of double-peaked narrow-line AGNs. Using these criteria, we determine the 17 most compelling dual AGN candidates in our sample.
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