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arXiv 2108.04288astro-ph.HE
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使用NuSTAR观测的Seyfert 2 ESO 103- 035日冕温度变化的证据

Evidence for coronal temperature variation in Seyfert 2 ESO 103--035 using NuSTAR observations

Samuzal Barua, V. Jithesh, Ranjeev Misra, Gulab C Dewangan, Rathin Sarma, Amit Pathak, Biman J Medhi

摘要:

利用\textit{NuSTAR}观测资料对活动星系核ESO 103- 035进行了通量分辨光谱分析。在早期的工作之后,我们使用具有相对论反射分量的热康普顿化模型来拟合光谱,以获得两个通量水平的日冕温度的估计。在3- 78 keV波段,当通量从$9.8$增加到$11.9 \times 10^{-11}$ erg cm $^{-2}$ s $^{-1}$时,日冕温度从24.0 $^{+6.8}_{-3.4}$增加到55.3 $^{+54.6}_{-7.2}$ keV(误差在1- $σ$置信水平)。高能光子折射率的边际变化允许不变化的光学深度和以因子$\sim$ 2变化的光学深度。这与先前对活动星系核Ark 564的\textit{NuSTAR}通量分辨光谱学的工作形成对比,在该工作中发现温度随着通量以及光学深度的$10$变化而降低。结果可以理解的框架,活动星系核的变化是由日冕加热的变化,导致相关的温度与流量的增加和相反的效果时,变化是由种子光子通量的变化占主导地位。

英文摘要:

We report flux-resolved spectroscopic analysis of the active galactic nucleus (AGN) ESO 103--035 using \textit{NuSTAR} observations. Following an earlier work, we fit the spectra using a thermal Comptonization model with a relativistic reflection component to obtain estimates of the coronal temperature for two flux levels. The coronal temperature was found to increase from 24.0$^{+6.8}_{-3.4}$ to 55.3$^{+54.6}_{-7.2}$ keV (errors at 1-$σ$ confidence level) as the flux increased from $9.8$ to $11.9 \times 10^{-11}$ erg cm$^{-2}$ s$^{-1}$ in the 3--78 keV band. A marginal variation in the high energy photon index allows for both, a non-varying optical depth and for the optical depth to have varied by a factor of $\sim$2. This is in contrast to a previous work on \textit{NuSTAR} flux resolved spectroscopy of the AGN, Ark 564, where the temperature was found to decrease with flux along with a $10$\% variation in the optical depth. The results maybe understood in a framework where AGN variability is either dominated by coronal heating variation leading to correlated increase of temperature with flux and the opposite effect being seen when the variability is dominated by changes in the seed photon flux.

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