论文标题
三重合并的AGN试验：检测微弱的X射线点源
AGN Triality of Triple Mergers: Detection of Faint X-ray Point Sources
论文作者
论文摘要
我们通过对附近三重AGN的首次系统搜索（z <0.077）三重星系合并进行的第一次系统搜索进行了X射线分析。我们分析了与Baymax的7个三重星系合并（X射线中的多重AGN分析）的档案Chandra观测值，将每个观测值与单个，双重和三重X射线点源模型拟合。通过这样做，我们得出结论，1个三重合并具有一个X射线点源（SDSS J0858+1822，尽管不太可能是AGN）； 5个三重合并很可能由两个X射线点源（NGC 3341，SDSS J1027+1749，SDSS J1631+2352，SDSS J1708+2153和SDSS J2356 $ - $ 1016）;一个系统由三个X射线点源（SDSS J0849+1114）组成。通过拟合每个点源的单个X射线光谱，我们分析了2-7 keV亮度以及与每个电势AGN相关的遮挡水平。我们发现4/5双X射线点源系统具有明亮的X射线光度（L_2-7 KEV> 10^40 ERG S^-1）的主要和次要点源，可能与4个新的未发现的双重AGN有关。发现双点源系统的物理分离在3-9 kpc和2x10^-3-3-0.84之间。在我们的同伴论文中提出了一项多波长分析以确定这项工作中发现的X射线点源的起源（Foord等，2020c）。
We present results from our X-ray analysis of the first systematic search for triple AGN in nearby (z<0.077) triple galaxy mergers. We analyze archival Chandra observations of 7 triple galaxy mergers with BAYMAX (Bayesian Analysis of Multiple AGN in X-rays), fitting each observation with single, dual, and triple X-ray point source models. In doing so, we conclude that 1 triple merger has one X-ray point source (SDSS J0858+1822, although it's unlikely to be an AGN); 5 triple mergers are likely composed of two X-ray point sources (NGC 3341, SDSS J1027+1749, SDSS J1631+2352, SDSS J1708+2153, and SDSS J2356$-$1016); and one system is composed of three X-ray point sources (SDSS J0849+1114). By fitting the individual X-ray spectra of each point source, we analyze the 2-7 keV luminosities as well as the levels of obscuration associated with each potential AGN. We find that 4/5 dual X-ray point source systems have primary and secondary point sources with bright X-ray luminosities (L_2-7 kev >10^40 erg s^-1), possibly associated with 4 new undetected dual AGN. The dual and triple point source systems are found to have physical separations between 3-9 kpc and flux ratios between 2x10^-3 - 0.84. A multi-wavelength analysis to determine the origin of the X-ray point sources discovered in this work is presented in our companion paper (Foord et al. 2020c).
