Resolving accretion flows in nearby active galactic nuclei with the Event Horizon Telescope

Resolving accretion flows in nearby active galactic nuclei with the Event Horizon Telescope
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使用事件视界望远镜解析附近活动星系核中的吸积流

DOI:
10.1093/mnras/stz2874
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发表时间:
2019-07
影响因子:
4.8
通讯作者:
Yaherlyn Diaz
Yaherlyn Diaz
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bidisha B;yopadhyay;Fu-Guo Xie;Neil M Nagar;Dominik R G Schleicher;Venkatessh Ramakrishnan;Patricia Arévalo;Elena López;Yaherlyn Diaz

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事件视界望远镜 (EHT) 现在首次获得了 M87 超大质量黑洞周围光子环的图像,为通过甚长基线干涉测量 (VLBI) 探测超大质量黑洞的物理现象提供了独特的机会,例如事件视界的存在、吸积过程以及低光度活动星系核 (LLAGN) 中喷流的形成。我们建立了一个理论模型,其中包括平流主导的吸积流 (ADAF),其中流中的热电子和非热电子发射,以及简单的无线电射流流出。该模型的预测光谱能量分布 (SED) 与亚角秒分辨率观测结果进行比较,以获得模型参数的最佳估计。模型预测的不同频段的径向发射剖面用于预测是否可以通过 EHT 或 Global 3 毫米 VLBI 阵列 (GMVA) 等望远镜来解决流入问题。在这项工作中,该模型最初使用 M87 的高分辨率 SED 数据进行测试,然后应用于我们的五个星系样本(Cen A、M84、NGC 4594、NGC 3998 和 NGC 4278)。然后,该模型允许我们预测是否可以在 8 小时积分时间内使用 EHT 或 GMVA 检测并解析这些星系中的任何一个的流入。
The Event Horizon Telescope (EHT), now with its first ever image of the photon ring around the supermassive black hole of M87, provides a unique opportunity to probe the physics of supermassive black holes through Very Long Baseline Interferometry (VLBI), such as the existence of the event horizon, the accretion processes as well as jet formation in low-luminosity AGNs (LLAGNs). We build a theoretical model that includes an advection dominated accretion flow (ADAF) with emission from thermal and non-thermal electrons in the flow and a simple radio jet outflow. The predicted spectral energy distribution (SED) of this model is compared to sub-arcsec resolution observations to get the best estimates of the model parameters. The model-predicted radial emission profiles at different frequency bands are used to predict whether the inflow can be resolved by the EHT or with telescopes such as the Global 3-mm VLBI array (GMVA). In this work the model is initially tested with high-resolution SED data of M87 and then applied to our sample of five galaxies (Cen A, M84, NGC 4594, NGC 3998, and NGC 4278). The model then allows us to predict if one can detect and resolve the inflow for any of these galaxies using the EHT or GMVA within an 8 h integration time.
半人马座 A 黑洞的质量,来自 SINFONI AO 辅助的恒星运动学积分场观测
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