从引力红移测量推断孤立中子星的整体性质
The Bulk Properties of Isolated Neutron Stars Inferred from the Gravitational Redshift Measurements
AI总结：
本研究采用含最新中子星质量-半径观测约束的三个物态方程模型（含一阶强相变模型），更新三颗孤立中子星的引力质量等整体性质估算，发现新约束更严格、质量约大0.1倍太阳质量，相变对结果影响甚微。
摘要：
测量大多数孤立中子星（INSs）的整体性质是一项具有挑战性的任务。Tang等人（2020年）基于观测数据约束的中子星（NS）物质物态方程（EoS），开发了一种新方法，用以推断几颗已有引力红移数据的孤立中子星的引力质量。然而，在该工作中，作者仅考虑了核实验/核理论以及GW170817引力波数据对物态方程的约束，并未考虑可能存在的相变。在本研究中，我们采用了三个受最新多信使中子星数据约束的物态方程模型（其中一个包含一阶强相变），特别是纳入了中子星内部成分探测器（Neutron Star Interior Composition Explorer）对两颗中子星的最新质量-半径测量结果，以此更新对RBS 1223、RX J0720.4-3125和RX J1856.5-3754的引力质量估算。与我们之前的方法相比，新的约束更严格，推算出的引力质量约大0.1倍太阳质量（$M_\u2299$）。所有推断出的引力质量均处于通过其他方式测量的中子星质量范围内。我们还计算了这些源的半径、潮汐形变率和转动惯量。纳入一阶强相变对结果的修正影响很小。
英文摘要：
The measurements of the bulk properties of most isolated neutron stars (INSs) are challenging tasks. Tang et al. (2020) have developed a new method, based on the equation of state (EoS) of neutron star (NS) material constrained by the observational data, to infer the gravitational masses of a few INSs whose gravitational redshifts are available. However, in that work, the authors only considered the constraints on the EoS from nuclear experiments/theories and the gravitational wave data of GW170817; the possible phase transition has not been taken into account. In this work, we adopt three EoS models (including the one incorporates a first-order strong phase transition) that are constrained by the latest multimessenger NS data, including in particular the recent mass\textendash radius measurements of two NSs by Neutron Star Interior Composition Explorer, to update the estimation of the gravitational masses of RBS 1223, RX J0720.4-3125, and RX J1856.5-3754. In comparison to our previous approach, the new constraints are tighter, and the gravitational masses are larger by about $0.1M_\odot$. All the inferred gravitational masses are within the range of the NS masses measured in other ways. We have also calculated the radius, tidal-deformability, and moment of inertia of these sources. The inclusion of the first-order strong phase transition has little influence on modifying the results.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
