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arXiv 2409.07908astro-ph.HE
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利用合成NICER数据对吸积毫秒脉冲星进行参数约束

Parameter constraints for accreting millisecond pulsars with synthetic NICER data

Bas Dorsman, Tuomo Salmi, Anna L. Watts, Mason Ng, Satish Kamath, Anna Bobrikova, Juri Poutanen, Vladislav Loktev, Yves Kini, Devarshi Choudhury, Serena Vincigu… 展开作者

Bas Dorsman, Tuomo Salmi, Anna L. Watts, Mason Ng, Satish Kamath, Anna Bobrikova, Juri Poutanen, Vladislav Loktev, Yves Kini, Devarshi Choudhury, Serena Vinciguerra, Slavko Bogdanov, Deepto Chakrabarty

AI总结:

本文通过修改X-PSI代码引入吸积盘和大气模型,并利用合成NICER数据验证了对吸积毫秒脉冲星质量、半径和热斑参数的约束能力,为未来NICER及IXPE联合分析奠定基础。

摘要:

脉冲轮廓建模(PPM)是一种用于推断毫秒脉冲星质量、半径和热斑性质的技术。PPM目前已被常规用于利用中子星内部组成探测器(NICER)的数据分析转动供能毫秒脉冲星(RMPs)。将PPM扩展到吸积毫秒脉冲星(AMPs)具有吸引力,因为它们是一类不同的源,具有由吸积驱动的热斑产生的明亮X射线辐射。在本文中,我们提出了对其中一个PPM代码X-PSI的修改,使其能够用于AMPs。特别是,我们实现了适用于AMPs热斑的吸积盘和大气模型,并提高了整体计算效率。然后,我们在两个具有合理AMPs参数的场景中,利用合成NICER数据测试参数恢复。我们发现在第一个场景中,即热斑较大时,我们能够紧密且准确地约束包括质量和半径在内的所有参数。在第二个场景中,即高倾角系统且热斑较小时,我们发现模型参数的一个子集之间存在简并性,并且推断的质量和半径存在轻微偏差。这项对合成数据的分析为未来利用NICER数据对AMPs进行分析奠定了基础。此类分析可以通过未来对成像X射线偏振测量探测器(IXPE)偏振数据的(联合)分析加以补充。

英文摘要:

Pulse profile modelling (PPM) is a technique for inferring mass, radius and hotspot properties of millisecond pulsars. PPM is now regularly used for analysis of rotation-powered millisecond pulsars (RMPs) with data from the Neutron Star Interior Composition ExploreR (NICER). Extending PPM to accreting millisecond pulsars (AMPs) is attractive, because they are a different source class featuring bright X-ray radiation from hotspots powered by accretion. In this paper, we present a modification of one of the PPM codes, X-PSI, so that it can be used for AMPs. In particular, we implement a model of an accretion disc and atmosphere model appropriate for the hotspots of AMPs, and improve the overall computational efficiency. We then test parameter recovery with synthetic NICER data in two scenarios with reasonable parameters for AMPs. We find in the first scenario, where the hotspot is large, that we are able to tightly and accurately constrain all parameters including mass and radius. In the second scenario, which is a high inclination system with a smaller hotspot, we find degeneracy between a subset of model parameters and a slight bias in the inferred mass and radius. This analysis of synthetic data lays the ground work for future analysis of AMPs with NICER data. Such an analysis could be complemented by future (joint) analysis of polarization data from the Imaging X-ray Polarimetry Explorer (IXPE).

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。

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