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arXiv 1807.01490astro-ph.GA
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来自主要合并的内在和观察到的对偶AGN分数

Intrinsic and observed dual AGN fractions from major mergers

J. M. Solanes, J. D. Perea, G. Valentí-Rojas, A. del Olmo, I. Márquez, C. Ramos Almeida, J. L. Tous

摘要:

一套432碰撞无碰撞的模拟的质量比为1:1和3:1的螺旋星系的绑定对,与$Λ$ CDM范式一致的全球性质,被用来测试的猜想,主要合并燃料的双重AGN(DAGN)的本地体积。我们的分析基于这样的前提:可以通过用对其在相空间中的相对分离的限制来取代中心BH的物理特性来捕获这种情况的本质方面。我们介绍了几种估计的DAGN分数和推断预测的活动水平和分辨率限制通常涉及这些系统的调查,评估其依赖的参数控制的长度合并和核活动。给定一组约束条件,我们发现,后者的一些因素所采用的值往往条件的结果从个别实验。尽管如此,结果并没有揭示,在一般情况下,非常紧密的相关性,是频率的趋势归一化合并时间与轨道圆度相关的最明显的效果。与其他理论研究一致,我们的模拟预测这些系统的内在丰度范围从$\sim$几到$15\%$取决于实现的最大水平的核活动。与此同时,我们表明,这些概率减少了约一个数量级时,他们被过滤的DAGN分数在低红移的观测研究所施加的典型约束。作为一个整体,本工作的结果证明,考虑到最常见的限制,在光学波长的密切的活性对的检测本身是足够的调和固有频率设想在一个层次的宇宙与小部分的双峰窄线系统,这是经常报告在千帕尺度。

英文摘要:

A suite of 432 collisionless simulations of bound pairs of spiral galaxies with mass ratios 1:1 and 3:1, and global properties consistent with the $Λ$CDM paradigm, is used to test the conjecture that major mergers fuel the dual AGN (DAGN) of the local volume. Our analysis is based on the premise that the essential aspects of this scenario can be captured by replacing the physics of the central BH with restrictions on their relative separation in phase space. We introduce several estimates of the DAGN fraction and infer predictions for the activity levels and resolution limits usually involved in surveys of these systems, assessing their dependence on the parameters controlling the length of both mergers and nuclear activity. Given a set of constraints, we find that the values adopted for some of the latter factors often condition the outcomes from individual experiments. Still, the results do not reveal, in general, very tight correlations, being the tendency of the frequencies normalized to the merger time to anticorrelate with the orbital circularity the clearest effect. In agreement with other theoretical studies, our simulations predict intrinsic abundances of these systems that range from $\sim$few to $15\%$ depending on the maximum level of nuclear activity achieved. At the same time, we show that these probabilities are reduced by about an order of magnitude when they are filtered with the typical constraints applied by observational studies of the DAGN fraction at low redshift. As a whole, the results of the present work prove that the consideration of the most common limitations involved in the detection of close active pairs at optical wavelengths is sufficient by itself to reconcile the intrinsic frequencies envisaged in a hierarchical universe with the small fractions of double-peaked narrow-line systems which are often reported at kpc-scales.

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