基于NICER数据的中子星PSR J0614-3329的半径测量
The Radius of the Neutron Star PSR J0614-3329 from NICER Data
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中文总结 AI 辅助
本文分析NICER数据，测得中子星PSR J0614-3329赤道半径68%可信区间为9.88-12.77km，还开展NICER与XMM-Newton数据联合拟合，探讨其对中子星核心致密物质性质的意义。
中文摘要 AI 辅助
中子星半径测量，尤其是利用中子星内部组成探测器（NICER）收集的X射线数据进行的测量，为核饱和密度以上的冷催化物质模型提供了宝贵信息。本文对318赫兹脉冲星PSR J0614-3329的NICER数据开展分析，该脉冲星的质量经射电观测确定约为1.4-1.5倍太阳质量。我们探究的最佳拟合模型包含三个均匀温度的圆形热点，得出赤道圆周半径的68%可信区间为9.88-12.77千米。我们还对该脉冲星的NICER数据与X射线多镜面任务（XMM-Newton）数据开展联合拟合，但发现当按常规假设XMM-Newton的背景由周围天区观测确定时，同时拟合两组数据的最佳模型会系统性低估XMM-Newton数据。最后，我们结合其他中子星的数据，探讨了本研究结果对中子星核心致密物质性质的意义。
英文摘要
Neutron star radius measurements, particularly using X-ray data collected with the Neutron star Interior Composition Explorer (NICER), have provided invaluable information for models of cold, catalyzed matter at densities above that of nuclear saturation. Here we present an analysis of NICER data on the 318-Hz pulsar PSR J0614-3329, which has a mass ~1.4-1.5 solar masses determined from radio observations. The best-fitting model we explore has three uniform-temperature circular hot spots and yields a symmetric 68% credible range for the equatorial circumferential radius of 9.88-12.77 km. We also explore joint fits to the NICER data and the X-ray Multi-Mirror (XMM-Newton) data on this pulsar, but find that the models that best fit both data sets systematically underpredict the XMM-Newton data when, as is standard, it is assumed that the XMM-Newton background is known from observations of surrounding fields. Finally, we discuss the implications of our results, combined with data on other neutron stars, for the properties of the dense matter in neutron star cores.
发表机构
- University of Maryland（马里兰大学）
- Joint Space-Science Institute, University of Maryland（马里兰大学联合空间科学研究所）
- Institute for Advanced Study（高等研究院）
- University of Illinois at Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）
- Department of Physics, University of Illinois at Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校物理系）
- Department of Astronomy, University of Illinois at Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校天文学系）
- Astroparticle Physics Laboratory NASA/GSFC（NASA/戈达德太空飞行中心高能粒子物理实验室）
- Center for Research and Exploration in Space Science and Technology, NASA/GSFC（NASA/戈达德太空飞行中心空间科学与技术研究探索中心）
- X-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center（NASA戈达德太空飞行中心X射线天体物理实验室）
机构由 AI 辅助整理，请以论文原文为准。
