发表机构
Wayne State University; University of Michigan; NASA Goddard Space Flight Center; California Institute of Technology（韦恩州立大学; 密歇根大学; 美国宇航局戈达德太空飞行中心; 加州理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用XRISM和NuSTAR对Serpens X-1进行联合光谱分析，确定其倾角为5°±1°、内盘半径为6.6±0.6 Rg，并分析8次I型X射线暴。
AI 中文摘要
我们展示了中子星低质量X射线双星Serpens X-1的首次XRISM和NuSTAR联合观测。我们对XRISM/Resolve、XRISM/Xtend和NuSTAR的联合观测数据进行光谱建模，测试了康普顿化模型和双热连续谱模型。我们发现，混合双热模型能充分描述源的连续谱，而康普顿化模型则预测出大量非物理的参数值。我们进行了反射建模，并严格约束了源的倾角为5°±1°，内盘半径为6.6±0.6 Rg。我们表明，XRISM/Resolve的光谱分辨率能够确定唯一的内盘半径，这有望在其他系统中约束中子星的自转。我们讨论了在约8 keV以上XRISM/Resolve与NuSTAR之间光谱形状的差异。我们还展示了观测期间发生的8次I型X射线暴的光变曲线和光谱分析。
英文摘要
We present the first simultaneous XRISM and NuSTAR observations of the neutron star low mass X-ray binary Serpens X-1. We perform spectral modeling on the joint observations of XRISM/Resolve, XRISM/Xtend, and NuSTAR, testing Comptonization and double thermal continuum model prescriptions. We find that a hybrid double thermal model adequately describes the underlying continuum of the source while the Comptonization models predict largely unphysical parameter values. We perform reflection modeling and confirm with tight constraints an inclination of 5^{\circ} \pm 1^{\circ} and inner disk radius of 6.6 \pm 0.6 Rg for the source. We show that the spectral resolution of XRISM/Resolve allows for the determination of a unique inner disk radius, which has the potential to constrain neutron star spin in other systems. We discuss discrepancies in spectral shape between XRISM/Resolve and NuSTAR above \sim 8 keV. We also present lightcurve and spectral analyses of 8 Type-I X-ray bursts that occurred during the observations.
CommentsAccepted for publication in ApJ, 15 pages, 6 figures
