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arXiv 2301.04731astro-ph.HEhep-ph
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AGN 1H~0707-495和IRAS 13224-3809中X射线混响的扩展电晕模型

Extended Corona Models of X-ray Reverberation in the AGN 1H~0707-495 and IRAS 13224-3809

S. Hancock, A. J. Young, P. Chainakun

摘要:

我们拟合了一个新的垂直扩展日冕模型,以先前测量的混响时间滞后观测的\emph{XMM-Newton}在两个极端可变窄线塞弗特1活动星系核(AGN),1H~0707-495和IRAS~13224-3809,在各种类似的观测通量组,并探讨了该模型在所有的观测超过16年的时间。该模型采用两个X射线源,分别位于黑洞旋转轴的高度,$h_1$和$h_2$。这些源具有其相关的光子指数$Γ_1$和$Γ_2$,其响应于盘中的波动,具有$t_\text{max}$的最大响应持续时间和$t_\text{shift}$两者的响应之间的传播延迟。我们发现,对于1H 0707-495,$h_2$与$Γ_1$显著相关,与电离$ξ$反相关。虽然1H 0707-495日冕向上延伸,但发射似乎更柔和,圆盘的电离程度更低。我们在IRAS 13224-3809中发现了相似性,但$Γ_2$与$t_\text{max}$和$t_\text{shift}$之间存在显著的反相关性。这表明,当IRAS 13224-3809日冕在垂直向上延伸时变得更软时,整体日冕响应发生得更快。这也可能意味着内部椎间盘也变得更加活跃。此外,IRAS 13224-3809中的$Γ_1$和$Γ_2$是极端的,相对较少的变量,但比1H 0707-495中更分离。这意味着IRAS 13224-3809日冕可能比1H 0707-495更不均匀,因为它有两个更清晰的光谱带,分别是$Γ_1$和$Γ_2$(可能与两个不同的日冕温度区有关)。

英文摘要:

We fit a new vertically extended corona model to previously measured reverberation time lags observed by \emph{XMM-Newton} in two extremely variable Narrow Line Seyfert 1 Active Galactic Nuclei (AGN), 1H~0707-495 and IRAS~13224-3809, in a variety of similarly observed flux groups and explore the model in all observations over a 16 year period. The model employs two X-ray sources located along the black hole rotational axis at height, $h_1$ and $h_2$ respectively. These sources have their associated photon indices $Γ_1$ and $Γ_2$ which respond to fluctuations in the disc with a maximum response duration of $t_\text{max}$ and a propagation delay between the response of the two of $t_\text{shift}$. We find that for 1H 0707-495, $h_2$ is significantly correlated with $Γ_1$ and anti-correlated with ionisation $ξ$. Whilst the 1H 0707-495 corona extends upwards, the emission appears softer and the disc is less ionised. We find similarities in IRAS 13224-3809, but significant anti-correlation between $Γ_2$ and both $t_\text{max}$ and $t_\text{shift}$. This suggests that when the IRAS 13224-3809 corona becomes softer while extending vertically upwards, the overall corona response occurs faster. This may also suggest that the inner disc also becomes more active. In addition, $Γ_1$ and $Γ_2$ are extreme, relatively less variable, but more separate in IRAS 13224-3809 than in 1H 0707-495. This suggests that the IRAS 13224-3809 corona may be more patchy in the sense that it has two more clear distinct spectral zones of $Γ_1$ and $Γ_2$ (possibly relating to two distinct zones of coronal temperature) when compared to 1H 0707-495.

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