A novel “spectral‐ratio model fitting” to resolve complicated X‐ray spectral variations in active galactic nuclei
A novel “spectral‐ratio model fitting” to resolve complicated X‐ray spectral variations in active galactic nuclei
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一种新颖的“光谱比模型拟合”来解决活动星系核中复杂的 X 射线光谱变化
DOI：
10.1002/asna.20230039
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发表时间：
2023
影响因子：
0.9
通讯作者：
Ebisawa Ken
中科院分区：
文献类型：
--
作者：
Midooka Takuya;Mizumoto Misaki;Ebisawa Ken
当代的辐射磁流体动力学模拟的活动星系核预测存在的热和强大的吸积盘风，它变得不稳定远离中心区域，并变成气体团块。这些内部风和外部团块实际上可以分别作为超快流出物（UFO）和cloudspeaker吸收器观察到。我们可以把这幅图称为“热内冷外风模型”。在观测上，由于复杂的光谱变化，对不明飞行物和星云吸收器的起源进行限制是具有挑战性的。本文提出了一种新的方法，即“光谱比模型拟合”法，用以解决吸收体和其它光谱成分的参数简并问题。在该方法中，吸收体在视线上的参数由部分吸收光谱与非吸收光谱的比值来估计。我们将这种方法应用于XMM-牛顿在2016年观察到的窄线塞弗特1星系IRAS 13224-3809，该源显示出极端的光谱变化和复杂的吸收特征。结果，我们发现，软光谱的变化主要是由轻度电离的clueros吸收剂的覆盖率的变化来解释的，并且这些吸收剂以与UFO相当的高速度流出（~ 0.2-0.3 c）。这一结果表明，cloudspeaker吸收体和UFO的形成有着相同的起源，支持“热的内部和cloudspeaker外部风模型”。
Contemporary radiation-magnetohydrodynamic simulation of the AGNs predicts presence of the hot and strong accretion disk wind, which gets unstable far from the central region and turns into gas clumps. These inner-wind and outer clumps may be actually observed as the ultrafast outflows (UFOs) and the clumpy absorbers, respectively. We may call this picture as the "hot inner and clumpy outer wind model". Observationally, it is challenging to place constraints on the origin of the UFOs and clumpy absorbers due to complicated spectral variations. We developed a novel method, "spectral-ratio model fitting", to resolve parameter degeneracy of the clumpy absorbers and other spectral components. In this method, the parameters of the absorber in the line of sight are estimated from the ratio of the partially absorbed spectrum to the non-absorbed one. We applied this method to the narrow-line Seyfert 1 galaxy IRAS 13224-3809 observed by XMM-Newton in 2016 for 1.5 Ms, where the source showed extreme spectral variability and complex absorption features. As a result, we found that the soft spectral variation is mostly explained by a change of the covering fraction of the mildly-ionized clumpy absorbers, and that these absorbers are outflowing with such a high velocity that is comparable to that of the UFO (~ 0.2-0.3 c). This result implies that the formation of the clumpy absorbers and the UFO shares the same origin, supporting the "hot inner and clumpy outer wind model".
使用 Chandra HETGS 观察到的 I 型 AGN 的软 X 射线研究
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
B. McKernan;Tahir Yaqoob Chris Reynolds
通讯作者：
Tahir Yaqoob Chris Reynolds
IRAS 13224–3809 的可变相对论流出
DOI：
10.3847/1538-4357/aae438
发表时间：
2018
期刊：
The Astrophysical Journal
影响因子：
--
作者：
G. Chartas;Manuel H. Cañas
通讯作者：
Manuel H. Cañas
NGC 5548 IV 中活动星系核的解剖。
影响因子：
6.5
作者：
L. D. Gesu;E. Costantini;J. Ebrero;M. Mehdipour;J. Kaastra;J. Kaastra;F. Ursini;P. Petrucci;M. Cappi;G. Kriss;G. Kriss;S. Bianchi;G. Branduardi‐Raymont;B. Marco;A. Rosa;S. Kaspi;S. Paltani;Ciro Pinto;G. Ponti;K. Steenbrugge;M. Whewell
通讯作者：
M. Whewell