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arXiv 1905.02147astro-ph.HE
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NGC 4151的光谱性质及用TCAF解估算黑洞质量

Spectral properties of NGC 4151 and the Estimation of black hole mass using TCAF solution

Prantik Nandi, Sandip K. Chakrabarti, Santanu Mondal

摘要:

利用\textit{NuSTAR}对2012年Seyfert 1.5活动星系核(AGN)NGC~4151进行了X射线能谱分析。这是第一次尝试,以适应AGN数据使用物理的两个组成部分平流(TCAF)的解决方案。利用TCAF模型得到的光谱,我们解开了在$3.0$ ~ $70.0$ ~keV能量范围内源的连续辐射性质。该模型直接在{ \fontfamily{qcr} \selectfont XSPEC}中用作加性局部模型。此外,我们使用了幂律(PL)组件,以照顾可能的X射线贡献的射流,这是没有纳入目前版本的TCAF。我们的主要目标是从现有的档案数据中获得中心超大质量黑洞的流动性质和质量。我们从三次观测的光谱拟合中获得的平均质量的最佳估计是$M_{BH}=3.03^{+0.26}_{-0.26}\times 10^7 M_\odot$。这与文献中早期的估计一致,例如混响映射、气体运动学和黑洞周围的恒星动力学。根据模型拟合的物理参数,讨论了吸积动力学和流动几何。模型拟合的盘吸积率低于低角动量晕吸积率,表明源在观测过程中处于硬态。

英文摘要:

We present X-ray spectral analysis of Seyfert 1.5 Active Galactic Nuclei (AGN) NGC~4151 using \textit{NuSTAR} observation during 2012. This is the first attempt to fit an AGN data using the physical Two Component Advective flow (TCAF) solution. We disentangle the continuum emission properties of the source in the energy range $3.0$ to $70.0$~keV using the spectrum obtained from TCAF model. This model was used as an additive local model directly in {\fontfamily{qcr}\selectfont XSPEC}. Additionally, we used a power law (PL) component, to take care of possible X-ray contribution from the jet, which is not incorporated in the present version of TCAF. Our primary aim is to obtain the flow properties and the mass of the central supermassive black hole from the available archival data. Our best estimate of the average mass obtained from spectral fits of three observations, is $M_{BH}=3.03^{+0.26}_{-0.26}\times 10^7 M_\odot$. This is consistent with earlier estimations in the literature such as reverberation mapping, gas kinematics and stellar dynamics around black holes. We also discuss the accretion dynamics and the flow geometry on the basis of model fitted physical parameters. Model fitted disk accretion rate is found to be lower than the low angular momentum halo accretion rate, indicating that the source was in a hard state during the observation.

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