论文标题
IR选定活性银核的特性
Properties of IR selected Active Galactic Nuclei
论文作者
论文摘要
语境。星系的活性银河核（AGN）在星系的生命和进化中起着重要作用，因为它们对某些特性和星系的进化路径的影响。众所周知，红外发射对于选择具有AGN的星系很有用，尽管已经观察到恒星形成星系存在污染。目标。在这项工作中，我们研究了在中期和近IR波长中识别的AGN的星系性能。使用光谱和X射线光度法证实了在IR波长下选择的AGN样品。我们研究了光学和IR颜色选择的AGN的近紫外，光学，近IR（miR）特性以及[O III]λ5007光度，黑洞质量和形态特性。方法。我们使用两种MID-IR颜色选择技术，幂律排放法和中IR选择技术的组合选择了AGN候选者。我们使用两个线诊断图确认了AGN选择，这些图表使用了比率[O III]/H \ B {ETA}和发射线宽度σ[O III]（Kinematics-excitation图，Kex）和主机Galaxy Stellar Stellar Mass（Mass-Excitation Gaingram，Mex，Mex），以及X-Ray Photay Photoy Photemement。结果。根据诊断图，在选择AGN方面取得了最大成功的方法是使用中MID和近IR选择技术和幂律发射的方法。使用中IR和近IR观察的组合的方法选择了大量AGN，并且在成功率（61％）和回收的AGN总数方面都相当有效。我们还发现，KEX方法在AGN选择框中呈现SF星系的污染。根据基于Sérsic指数的形态学研究，与没有AGN的星系相比，AGN样品具有凸起+磁盘成分的星系形态的百分比更高。
Context. Active galactic nuclei (AGN) of galaxies play an important role in the life and evolution of galaxies due to the impact they exert on certain properties and the evolutionary path of galaxies. It is well known that infrared (IR) emission is useful for selecting galaxies with AGNs, although it has been observed that there is contamination by star-forming galaxies. Aims. In this work we investigate galaxy properties hosting AGNs identified at mid and near-IR wavelengths. The sample of AGNs selected at IR wavelengths was confirmed using optical spectroscopy and X-ray photometry. We study the near-UV, optical, near and mid-IR (MIR) properties, as well as [O III] λ5007 luminosity, black hole mass and morphology properties of optical and IR colour selected AGNs. Methods. We selected AGN candidates using two mid-IR colour selection techniques, a power-law emission method and a combination of mid and near-IR selection techniques. We confirm the AGN selection with two line diagnostic diagrams that use the ratio [O III]/H\b{eta} and the emission line width σ [O III] (kinematics-excitation diagram, KEx) and the host galaxy stellar mass (mass-excitation diagram, MEx), as well as X-ray photometry. Results. According to the diagnostic diagrams, the methods with the greatest success in selecting AGNs are those that use a combination of a mid and near-IR selection technique and a power-law emission. The method that use a combination of mid and near-IR observation selects a large number of AGNs, and is reasonably efficient in both the success rate (61%) and total number of AGN recovered. We also find that the KEx method presents contamination of SF galaxies within the AGN selection box. According to morphological studies based on the Sérsic index, AGN samples have higher percentages of galaxy morphologies with bulge+disk components compared to galaxies without AGNs.
