NASA's Neutron Star Interior Composition Explorer (NICER) observed X-ray emission from the pulsar PSR J0030+0451 in 2018. Riley \textit{et al.} reported Bayesian parameter measurements of the mass and the radius of the star using pulse-profile modeling of the X-ray data. In this paper, we reproduce their result using the open-source software \textit{X-PSI} and the publicly available data. We reproduce the main result within the expected statistical error. We note the challenges we faced in reproducing the results. We demonstrate that not only that the analysis can be reproduced, it can also be reused in future works by changing the prior distribution for the radius, and by changing the sampler configuration. We find no significant change in the measurement of the mass and radius, demonstrating that the original result is robust to these changes. Finally, we provide a containerized working environment that facilitates third-party reproduction of the measurements of mass and radius of PSR J0030+0451 using the NICER observations.

翻译：美国国家航空航天局的“中子星内部成分探测器”（NICER）于2018年观测了脉冲星PSR J0030+0451的X射线辐射。Riley等人利用X射线数据的脉冲轮廓建模，报告了对该星体质量和半径的贝叶斯参数测量结果。本文中，我们使用开源软件《X-PSI》及公开数据重现了他们的结果，并在预期统计误差范围内复现了主要结论。我们记录了复制过程中遇到的挑战，并证明该分析不仅可被重现，还可通过改变半径的先验分布及采样器配置用于未来研究。研究发现质量和半径的测量结果无显著变化，表明原始结果对此类修改具有稳健性。最后，我们提供了容器化工作环境，便于第三方利用NICER观测数据独立复现PSR J0030+0451的质量与半径测量结果。