塞弗特1星系中的觉醒野兽KUG 1141+371 I
The Awakening Beast in the Seyfert 1 Galaxy KUG 1141+371 I
摘要：
KUG 1141+371是一个塞弗特1星系，在过去的十年里，它在光学和紫外波段同时显示出通量的增加。例如，2019年最新的雨燕观测表明，KUG 1141+371活动星系核的UVW2通量自2009年以来增加了一个数量级以上。与此同时，KUG 1141+371的软X射线通量自2007年以来也稳步增加了一个数量级。显著的多波长光度变化可能是由于质量吸积率从爱丁顿极限的0.6%提高到3.2%，假设黑洞质量为$10^{8}M_{\odot}$。在这项工作中，我们进行了详细的多历元X射线光谱分析，重点是X射线连续发射和令人困惑的软过量发射的变化。此外，我们的SED模型还表明，随着吸积率的增加，盘的温度同时增加，盘的内径减小。最后讨论了KUG 1141+371与黑洞爆发瞬变的可能联系。
英文摘要：
KUG 1141+371 is a Seyfert 1 galaxy that shows a simultaneous flux increase in the optical and UV bands in the past decade. For instance, the latest Swift observation in 2019 shows that the UVW2 flux of the AGN in KUG 1141+371 has increased by over one order of magnitude since 2009. Meanwhile, the soft X-ray flux of KUG 1141+371 also shows a steady increase by one order of magnitude since 2007. The significant multi-wavelength luminosity change is likely due to a boost of mass accretion rate from approximately 0.6% of the Eddington limit to 3.2%, assuming a black hole mass of $10^{8}M_{\odot}$. In this work, we conduct detailed multi-epoch X-ray spectral analysis focusing on the variability of the X-ray continuum emission and the puzzling soft excess emission. In addition, our SED models also suggest a simultaneous increase of disc temperature and a decreasing inner disc radius along with the increasing accretion rate. Finally, we discuss possible connection between KUG 1141+371 and black hole transients in outburst.
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