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首页> 外文期刊>Astronomy and astrophysics >Cyclotron resonant scattering feature simulations - I. Thermally averaged cyclotron scattering cross sections, mean free photon-path tables, and electron momentum sampling
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Cyclotron resonant scattering feature simulations - I. Thermally averaged cyclotron scattering cross sections, mean free photon-path tables, and electron momentum sampling

机译：回旋加速器共振散射特征模拟-I.热平均回旋加速器散射截面，平均自由光子路径表和电子动量采样

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Context. Electron cyclotron resonant scattering features (CRSFs) are observed as absorption-like lines in the spectra of X-ray pulsars. A significant fraction of the computing time for Monte Carlo simulations of these quantum mechanical features is spent on the calculation of the mean free path for each individual photon before scattering, since it involves a complex numerical integration over the scattering cross section and the (thermal) velocity distribution of the scattering electrons. Aims. We aim to numerically calculate interpolation tables which can be used in CRSF simulations to sample the mean free path of the scattering photon and the momentum of the scattering electron. The tables also contain all the information required for sampling the scattering electron’s final spin. Methods. The tables were calculated using an adaptive Simpson integration scheme. The energy and angle grids were refined until a prescribed accuracy is reached. The tables are used by our simulation code to produce artificial CRSF spectra. The electron momenta sampled during these simulations were analyzed and justified using theoretically determined boundaries. Results. We present a complete set of tables suited for mean free path calculations of Monte Carlo simulations of the cyclotron scattering process for conditions expected in typical X-ray pulsar accretion columns (0.01 ≤ B/Bcrit ≤ 0.12, where Bcrit = 4.413 × 1013 G, and 3 keV ≤ kBT ≤ 15 keV). The sampling of the tables is chosen such that the results have an estimated relative error of at most 1/15 for all points in the grid. The tables are available online (see link in footnote, page 1).
机译：上下文。在X射线脉冲星的光谱中，电子回旋共振散射特征（CRSF）被观察为吸收状线。这些量子力学特征的蒙特卡罗模拟的计算时间的很大一部分用于散射之前每个光子的平均自由程的计算，因为它涉及散射截面和（热）的复杂数值积分。散射电子的速度分布。目的我们旨在数值计算插值表，该表可用于CRSF模拟中以采样散射光子的平均自由程和散射电子的动量。该表还包含采样散射电子的最终自旋所需的所有信息。方法。这些表是使用自适应辛普森积分方案计算的。完善能量和角度网格，直到达到规定的精度。我们的仿真代码使用这些表来生成人工CRSF光谱。使用理论上确定的边界对在这些模拟过程中采样的电子矩进行了分析和证明。结果。我们提供了一套完整的表格，适用于典型X射线脉冲星积聚色谱柱（0.01≤B / Bcrit≤0.12，其中Bcrit = 4.413×1013 G，且3 keV≤kBT≤15 keV）。选择表的抽样，以使结果对网格中的所有点的估计相对误差最多为1/15。这些表可在线获得（请参见第1页脚注中的链接）。

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