AI 中文总结
研究五个爱丁顿比率跨度大的可变AGNs，通过多时期多波长观测，发现X射线热改正$\kappa_{\rm 2 - 10}$与$\lambda_{\rm Edd}$紧密相关，$\lambda_{\rm Edd}$是主要驱动因素，此发现为吸积流结构及辐射输出研究提供独特见解。
AI 中文摘要
活动星系核（AGNs）的热光度（$L_{\rm bol}$）是吸积物理的关键示踪剂，但其直接测定常受限于光谱覆盖范围和宿主星系的污染。热改正（$\kappa_{\lambda} = L_{\rm bol}/L_{\lambda}$）提供了估算$L_{\rm bol}$的实用方法，其中X射线热改正（$\kappa_{\rm 2 - 10}$）对探索吸积盘与X射线日冕之间的耦合至关重要。本文展示了对五个高度可变、状态变化的AGNs进行的多时期、多波长观测，其爱丁顿比率跨度超过三个数量级（$-3.6\lesssim \log \lambda_{\rm Edd} \lesssim -0.5$）。这一独特数据集揭示了$\kappa_{\rm 2 - 10}$与$\lambda_{\rm Edd}$之间非常紧密的关系，固有散射仅约为$\sim0.05$ dex。我们发现，虽然这些源在光度空间中遵循不同轨迹的热改正取决于黑洞质量，但它们都呈现相同的$\kappa_{\rm 2 - 10}-\lambda_{\rm Edd}$趋势。这明确表明$\lambda_{\rm Edd}$是X射线热改正的主要驱动因素，并指出了一个紧密的潜在趋势，可用于从X射线光度获得热输出的可靠估计。我们的结果突出了对可变AGN的时域、多波长观测如何为吸积流结构及其辐射输出提供独特见解。
英文摘要
The bolometric luminosity ($L_{\rm bol}$) of active galactic nuclei (AGNs) is a key tracer of accretion physics, but its direct determination is often hindered by limited spectral coverage and contamination of the host galaxy. Bolometric corrections ($κ_λ = L_{\rm bol}/L_λ$) offer a practical means of estimating $L_{\rm bol}$, with the X-ray bolometric correction ($κ_{\rm 2-10}$) being crucial for exploring the coupling between the accretion disk and the X-ray corona. Here we present multi-epoch, multi-wavelength observations of five highly variable, changing-state AGNs that span more than three orders of magnitude in Eddington ratio ($-3.6\lesssim \log λ_{\rm Edd} \lesssim -0.5$). This unique data set reveals a remarkably tight relation between $κ_{\rm 2-10}$ and $λ_{\rm Edd}$, with an intrinsic scatter of only $\sim0.05$ dex. We find that while the sources show bolometric corrections following different tracks in luminosity space that depend on black hole mass, they all display the same $κ_{\rm 2-10}-λ_{\rm Edd}$ trend. This shows unambiguously that $λ_{\rm Edd}$ is the primary driver of X-ray bolometric corrections, and points to a tight underlying trend that can be used to obtain reliable estimates of bolometric output from X-ray luminosities. Our results highlight how time-domain, multi-wavelength observations of variable AGN offer unique insights into the accretion flow structure and its radiative output.
Comments4 figures, accepted for publication in ApJ Letter. Comments are welcome
