发表机构
Università degli Studi Roma Tre; Istituto Nazionale di Fisica Nucleare, Sezione di Roma “Tor Vergata”; NASA Marshall Space Flight Center; Agenzia Spaziale Italiana; INAF - Osservatorio astronomico di Roma; Clemson University; INAF-Osservatorio Astronomico di Brera（罗马第三大学; 意大利国家核物理研究所罗马“托尔维加塔”分部; 美国国家航空航天局马歇尔太空飞行中心; 意大利航天局; 意大利国家天体物理研究所罗马天文台; 克莱姆森大学; 意大利国家天体物理研究所布里埃拉天文台）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用IXPE及协同观测数据，对西弗特星系NGC 5506进行偏振测量，给出2-8 keV偏振上限3.1%，并模拟日冕几何，约束倾角低于40°。
AI 中文摘要
我们报告了使用成像X射线偏振探测器（IXPE）对康普顿薄型西弗特星系NGC 5506进行的观测。该观测的净观测时间为975千秒，部分与NuSTAR（52千秒）和XMM-Newton（37千秒）同时进行。仅使用IXPE数据的简单基线模型，我们在99%置信水平上给出了2-8 keV偏振分数的上限：Π<3.1%。随后，我们结合三个X射线天文台的数据进行了光谱偏振分析。虽然纯光谱建模确认了相对论性反射和冷远距离反射的存在，以及主连续谱幂律，但它们的贡献对日冕Π的约束略有不同，具体取决于特定假设。我们还使用辐射传输代码MONK进行了蒙特卡洛模拟，探索了各种日冕几何形状。将这些结果与IXPE数据进行比较，并假设径向延伸的日冕（正如先前对类似源的观测所建议的那样），相应的偏振上限要求倾角低于40°。
英文摘要
We report on the observation of the Compton-thin Seyfert galaxy NGC~5506 performed with the Imaging X-ray Polarimetry Explorer (IXPE). The observation, with a net observing time of 975~ks, was partly simultaneous with \textit{NuSTAR} (52~ks) and \textit{XMM-Newton} (37~ks). Using a simple baseline model with IXPE data only, we find an upper limit on the 2--8~keV polarization fraction at the $99\%$ confidence level: $Π<3.1\%$. We then performed a spectropolarimetric analysis combining data from the three X-ray observatories. While pure spectral modeling confirms the presence of both relativistic and cold distant reflection, in addition to the primary continuum power law, their contributions lead to somewhat different constraints on the coronal $Π$, depending on the specific assumptions. We also performed Monte Carlo simulations with the radiative transfer code \texttt{MONK}, exploring various coronal geometries. Comparing these results with the IXPE data, and assuming a radially extended corona, as suggested by previous observations of similar sources, the corresponding polarization upper limits require inclination angles below 40°.
Comments9 pages, 5 figures, 1 table
