The X-ray dim isolated neutron stars (XDINSs) are peculiar pulsar-like objects, characterized by their very well Planck-like spectrum. In studying their spectral energy distributions, the optical/UV excess is a long standing problem. Recently, Kaplan et al. (2011) have measured the optical/UV excess for all seven sources, which is understandable in the resonant cyclotron scattering (RCS) model previously addressed. The RCS model calculations show that the RCS process can account for the observed optical/UV excess for most sources . The flat spectrum of RX J2143.0+0654 may due to contribution from bremsstrahlung emission of the electron system in addition to the RCS process.
Dynamics of black hole - neutron star binaries in young star clusters
年轻的星团可能是宇宙时间中大质量恒星最常见的诞生地，并以多种方式影响紧凑双星的形成。本文利用粒子数合成程序\texttt{MOBSE}与体程序\texttt{NBODY6++GPU}的接口，模拟了年轻星团中黑洞-中子星双星的形成过程.年轻星团中形成的BHNS（动力学BHNS）比孤立双星形成的BHNS（孤立BHNS）质量大得多：$\sim{}40$ ~\%的动力学BHNS合并有总质量$>15$ M $_\odot$，而只有$\sim{}0.01$ ~\%的孤立BHNS合并有超过这个值的质量。因此，我们的模型强烈支持GW 190814的动力学形成的情况下，它的总质量$\sim{}26$ M $_\odot$，如果这个事件是一个BHNS合并。我们所有的动力学BHNS都是在它们合并之前从它们的母星团中喷射出来的。因此，发生在该领域的BHNS合并的一个重要部分可能起源于一个年轻的星团。从引力波探测的BHNS合并的质谱将提供一个线索，以区分动力学和孤立形成的BHNS。
Testing selectively enhanced QCD axions couplings as an explanation of the RX J1856.5-3754 hard X-ray excess
Birla Institute of Technology and Science - Pilani（比拉理工学院皮拉尼分校）；Birla Institute of Technology and Science Pilani, K. K. Birla Goa Campus（比拉理工学院皮拉尼分校K.K.比尔拉果阿校区）
研究利用 QCD 轴子转换光子解释壮丽七颗中子星之一的硬 X 射线数据，采用核子 - 核子轫致辐射及库珀对破坏与形成过程，对比常用模型，发现微电子伏特尺度增强模型更吻合数据，可解释 2 - 8 千电子伏特硬 X 射线发射。
How Bright in Gravitational Waves are Millisecond Pulsars for the Galactic Center GeV Gamma-Ray Excess? A Systematic Study and Implications for Dark Matter
Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台暗物质与空间天文重点实验室）；School of Astronomy and Space Science, University of Science and Technology of China（中国科学技术大学天文与空间科学学院）；Fermi National Accelerator Laboratory（费米国家加速器实验室）；Kavli Institute for Cosmological Physics, University of Chicago（芝加哥大学卡弗里宇宙物理学研究所）
