论文标题
光学选择双AGN的X射线视图
The X-ray view of optically selected dual AGN
论文作者
论文摘要
我们介绍了一项针对光学选择的双重AGN的研究，预计分离为3--97〜kpc。使用多波长（MWL）信息（光学，X射线，MID-IR），我们表征了该样品的固有核性质，并将其与孤立系统的核能进行了比较。在124 X射线检测到的AGN候选物中，有52个成对出现，72个作为单X射线源出现。通过MWL分析，我们在> 80 \％的分数中证实了AGN的存在，成对的检测到的靶标（42位52）。 X射线光谱分析证实了随着分离的降低，AGN光度增加的趋势，表明合并可能在触发更多发光的AGN方面做出了贡献。通过X/MID-IR比率$ vs $ X射线颜色，我们估计了Compton-Thin-Thin Agn的一小部分（带有10 $^{22} $ CM $ $^{ - 2} $ $ <$ <$ <$ n $ _ {\ rm h} <$ 10 $^$ 10 $^{24} $ cm $ cm $ cm $^{ - 2} $，而约为80 \％的compton，是约80 \％的。 n $ _ {\ rm H}> $ 10 $^{24} $ cm $^{ - 2} $）来源。这些被遮盖的来源的部分比在孤立的AGN样品中发现的分数大，证实了成对的AGN表现出更高的遮阳性。通过比较被观察到的X射线光度，通过比较了降低的[O \ iii]发射，进一步证实了这一趋势。然而，在合并的早期阶段，该样品中康普顿厚来源的衍生部分低于与晚期双AGN样品的报道。将X射线中的n $ _ {\ rm H} $与狭窄线区域的E（B-V）衍生而来的N $ _ {\ rm H} $，我们发现吸收材料可能与圆环或宽线区域有关。我们还探索了双重AGN候选物的X射线检测效率，发现当正确观察到（在轴上位置和长时间暴露时）时，X射线数据代表了确认和研究双重AGN系统的有力方法。
We present a study of optically selected dual AGN with projected separations of 3--97~kpc. Using multi-wavelength (MWL) information (optical, X-rays, mid-IR), we characterized the intrinsic nuclear properties of this sample and compared them with those of isolated systems. Among the 124 X-ray detected AGN candidates, 52 appear in pairs and 72 as single X-ray sources. Through MWL analysis, we confirmed the presence of the AGN in a fraction >80\% of the detected targets in pairs (42 over 52). X-ray spectral analysis confirms the trend of increasing AGN luminosity with decreasing separation, suggesting that mergers may have contributed in triggering more luminous AGN. Through X/mid-IR ratio $vs$ X-ray colors, we estimated a fraction of Compton-thin AGN (with 10$^{22}$ cm$^{-2}$ $<$ N$_{\rm H} <$10$^{24}$ cm$^{-2}$) of about 80\%, while about 16\% are Compton thick (CT, with N$_{\rm H}>$10$^{24}$ cm$^{-2}$) sources. These fractions of obscured sources are larger than those found in samples of isolated AGN, confirming that pairs of AGN show higher obscuration. This trend is further confirmed by comparing the de-reddened [O\ III] emission with the observed X-ray luminosity. However, the derived fraction of Compton-thick sources in this sample at early stage of merging is lower than reported for late-merging dual-AGN samples. Comparing N$_{\rm H}$ from X-rays with that derived from E(B-V) from Narrow Line Regions, we find that the absorbing material is likely associated with the torus or the Broad Line Regions. We also explored the X-ray detection efficiency of dual-AGN candidates, finding that, when observed properly (at on-axis positions and with long exposures), X-ray data represent a powerful way to confirm and investigate dual-AGN systems.
