论文标题

主动银河核鬼:系统地搜索褪色的核

Active galactic nuclei ghosts: A systematic search for faded nuclei

论文作者

Esparza-Arredondo, Donaji, Osorio-Clavijo, Natalia, González-Martín, Omaira, Victoria-Ceballos, Cesar, Haro-Corzo, Sinhué, Reyes-Amador, Ulises, López-Sánchez, Jafet, Pasetto, Alice

论文摘要

诸如主动银河核(AGN)的重新定位,增强和褪色之类的物理过程尚不完全了解,因为这些事件的时间表预计将持续很多年。但是,众所周知,AGN组件之间的能量预算的差异,例如光电离区域和中红外(mir)灰尘回声,可以解释为对AGN进化的提示。在这里,我们提出了一个由88名AGN候选人组成的目录,其中示出了有关其在附近宇宙中活动的褪色和上升的提示。我们使用AGN缩放关系从877个候选者的初始样本中使用公开可用的光学,X射线和miR亮度选择它们。然后,我们使用多波长信息来丢弃被核外发射污染的来源,而X射线光度的污染物却无法很好地校正吸收。我们发现96%的候选人是褪色的来源。该结果表明了一种场景,宇宙过去在过去的某个地方具有其AGN活动的峰值,并且在当前的衰落阶段中占主导地位。或者,褪色阶段比上升阶段更长,这与星系合并模拟一致。这些淡出的候选者中约有50%与合并或交互系统有关。最后,我们还发现了约30%的候选者中存在喷气机的存在,并且首选的AGN尘埃几何形状类似于圆环,而不是类似风。如果核活动处于效率低下,我们的结果与核活动的褪色兼容。

Physical processes such as re-ignition, enhancement, and fading of active galactic nuclei (AGN) are not entirely understood because the timeline of these events is expected to last many years. However, it is well known that the differences in the energy budget between AGN components, like the optical ionizing region and the mid-infrared (MIR) dust echoes, can be interpreted as a hint on AGN evolution. Here we present a catalog of 88 AGN candidates showing hints on the fading and rising of their activity in the nearby Universe. We use AGN scaling relations to select them from an initial sample of 877 candidates using publicly available optical, X-ray, and MIR luminosities. We then use the multi-wavelength information to discard sources contaminated with extranuclear emission and those with an X-ray luminosity not well corrected for absorption. We find that 96% of our candidates are fading sources. This result suggests a scenario where the Universe had its peak of AGN activity somewhere in the past and is dominated by a fading phase at the present time. Alternatively, the fading phase is longer than the rising phase, which is consistent with galaxy merger simulations. Around 50% of these fading candidates are associated with merging or interacting systems. Finally, we also find the existence of jets in ~30% of these candidates and that the preferred AGN dust geometry is torus-like, instead of wind-like. Our results are compatible with the fading of nuclear activity, expected if they are in an inefficient state.

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