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首页> 外文期刊>The Astrophysical journal >Emission Signatures from Subparsec Binary Supermassive Black Holes. III. Comparison of Models with Observations
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Emission Signatures from Subparsec Binary Supermassive Black Holes. III. Comparison of Models with Observations

机译：Subparsec二进制超卡孔的发射签名。 III。 与观察模型的比较

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摘要

We present a method for comparing the Hβ emission-line profiles of observed supermassive black hole (SBHB) candidates and models of subparsec SBHBs in circumbinary disks. Using the approach based on principal component analysis, we infer the values of the binary parameters for the spectroscopic SBHB candidates and evaluate the parameter degeneracies, representative of the uncertainties intrinsic to such measurements. We find that as a population, the SBHB candidates favor the average value of the semimajor axis corresponding to log(a /M )?≈ 4.20?±?0.42 and comparable mass ratios, q ?>?0.5. If the SBHB candidates considered are true binaries, this result would suggest that there is a physical process that allows initially unequal-mass systems to evolve toward comparable mass ratios (e.g., accretion that occurs preferentially onto the smaller of the black holes) or point to some, yet unspecified, selection bias. Our method also indicates that the SBHB candidates equally favor configurations in which the mini-disks are coplanar or misaligned with the binary orbital plane. If confirmed for true SBHBs, this finding would indicate the presence of a physical mechanism that maintains misalignment of the mini-disks down to subparsec binary separations (e.g., precession driven by gravitational torques). The probability distributions of the SBHB parameters inferred for the observed SBHB candidates and our control group of AGNs are statistically indistinguishable, implying that this method can in principle be used to interpret the observed emission-line profiles once a sample of confirmed SBHBs is available but cannot be used as a conclusive test of binarity.
机译：我们提出了一种用于比较观察到的超大分离黑洞（SBHB）候选物（SBHB）候选物的Hβ排放线轮廓和亚宝峰SBHBS的模型的方法。使用基于主成分分析的方法，我们推断出光谱SBHB候选物的二元参数的值，并评估参数退化，代表这种测量的不确定因素。我们发现，作为一个人口，SBHB候选人赞成与日志相对应的半约轴的平均值（ a / m）？≈4.20？±0.42和相当的质量比， q？> ？0.5。如果考虑的SBHB候选者是真正的二进制文件，则该结果表明存在物理过程，其允许最初不等质量的系统朝向可比质量比（例如，优先发生在黑洞的较小孔上的凸起）或点一些，但未指明的选择偏见。我们的方法还表明SBHB候选者同样有利于迷你盘的配置，其中迷你盘是共面的或与二元轨道平面未对准。如果确认真正的SBHBS，则该发现将表明存在物理机制，其将迷你块的未对准保持在次级分离（例如，由引力扭矩驱动的Precession）。所观察到的SBHB候选者的SBHB参数的概率分布和我们的AGNS的控制组是统计学上的无法区分的，这意味着该方法原则上可以用于解释一旦确认的SBHB的样本可获得但不能用作二十型的结论性测试。

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