SKIRT中X射线荧光线固有线轮廓
Intrinsic line profiles for X-ray fluorescent lines in SKIRT
AI总结：
本文在SKIRT中实现X射线荧光线固有线轮廓，通过多洛伦兹参数化模拟冷气体运动学，证明其展宽和移动可被XRISM/Resolve探测，为约束冷气体速度结构提供新工具。
摘要：
我们在X射线辐射转移代码SKIRT中加入了最强荧光线固有线轮廓，以基于XRISM/Resolve和Athena/X-IFU的高分辨率谱线观测来模拟冷气体结构和运动学。Cr、Mn、Fe、Co、Ni和Cu的Ka和Kb线固有线轮廓基于多洛伦兹参数化实现，在辐射转移过程中从这些洛伦兹分量中采样线能量。在光学薄区域，SKIRT结果与实验室测得的固有线轮廓一致。通过一个包含运动学的更复杂三维模型，我们发现固有线轮廓被展宽和移动的程度足以被XRISM/Resolve探测到；该模型还证明了固有线形对于约束运动学的重要性。我们发现观测到的线轮廓直接反映冷气体运动学，无需任何额外的辐射转移效应。随着首批XRISM/Resolve数据的到来，对SKIRT的X射线辐射转移框架进行此次更新恰逢其时，为从X射线微量热仪光谱中约束冷气体速度结构提供了独特工具。
英文摘要：
We included the intrinsic line profiles of the strongest fluorescent lines in the X-ray radiative transfer code SKIRT to model the cold-gas structure and kinematics based on high-resolution line observations from XRISM/Resolve and Athena/X-IFU. The intrinsic line profiles of the Ka and Kb lines of Cr, Mn, Fe, Co, Ni, and Cu were implemented based on a multi-Lorentzian parameterisation and line energies are sampled from these Lorentzian components during the radiative transfer routine. In the optically thin regime, the SKIRT results match the intrinsic line profiles as measured in the laboratory. With a more complex 3D model that also includes kinematics, we find that the intrinsic line profiles are broadened and shifted to an extent that will be detectable with XRISM/Resolve; this model also demonstrates the importance of the intrinsic line shapes for constraining kinematics. We find that observed line profiles directly trace the cold-gas kinematics, without any additional radiative transfer effects. With the advent of the first XRISM/Resolve data, this update to the X-ray radiative transfer framework of SKIRT is timely and provides a unique tool for constraining the velocity structure of cold gas from X-ray microcalorimeter spectra.
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