吸积毫秒X射线脉冲星SRGA J144459.2-604207爆发衰减的光谱研究
Spectral study of the outburst decay of the accreting millisecond X-ray pulsar SRGA J144459.2-604207
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中文总结 AI 辅助
该研究利用NICER和雨燕卫星观测数据，通过吸收康普顿化模型等，研究吸积毫秒X射线脉冲星SRGA J144459.2-604207爆发衰减光谱，分析其光谱演化、宁静态光度及相关现象，探索外流等能量机制。
中文摘要 AI 辅助
我们利用中子星内部成分探测器（NICER）和雨燕卫星的观测数据，研究了吸积X射线毫秒脉冲星SRGA J144459.2-604207在2024年爆发期间的光谱。通过吸收康普顿化模型探索了爆发衰减、再耀发和宁静态期间的光谱。发现宁静态光谱也可用吸收幂律和吸收黑体模型解释。研究了源从爆发衰减到宁静态的光谱演化。还研究了约45年的长期宁静X射线活动，发现长期宁静光度可用深层地壳加热模型解释。此外，发现伴星的日冕活动无法单独为源的宁静X射线光度提供能量。将该源置于射电- X射线光度平面并与其他源比较，估计了其螺旋桨光度。在爆发衰减期间检测到几次再耀发，其中一次与超快外流和射电辐射的探测近乎同时发生。我们还探索了可能为这个吸积双星中的外流、射电辐射和相关喷流形成提供能量的合理机制。
英文摘要
We study the spectra of the accreting X-ray millisecond pulsar SRGA J144459.2-604207 during the 2024 outburst using the Neutron star Interior Composition Explorer (NICER) and Swift observations. The spectra during the outburst decay, reflares, and quiescent state are explored using the absorbed Comptonized model. We find that the spectra during the quiescent state can also be explained using the absorbed power-law and absorbed blackbody model. The spectral evolution of the source is explored as the outburst decays into quiescence. We study the long-term quiescent X-ray activity of the source spanning roughly 45 years and find that the long-term quiescent luminosity may be explained using the deep crustal heating model. We also find that the coronal activity of the companion star alone cannot power the quiescent X-ray luminosity of the source. We place the source on the radio-X-ray luminosity plane and compare its position with other sources. We estimate the propeller luminosity of the source and find that it is smaller than the estimated luminosity during reflares and the quiescent state during the 2024 outburst. Several reflares are detected during the outburst decay, one of which is near-simultaneous with the detection of an ultrafast outflow and radio emission. We explore plausible mechanisms that may power outflow, radio emission and associated jet formation in this accreting binary.
发表机构
- Aryabhatta Research Institute of Observational Sciences（阿亚巴哈塔观测科学研究所）
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