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arXiv 1806.03082astro-ph.HE
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吸积毫秒X射线脉冲星SAX J1748 2010年爆发内的X射线爆发。9 -2021

The X-ray bursts within the 2010 outburst of the accreting millisecond X-ray pulsar SAX J1748.9-2021

Ziwei Wu, Guoqiang Ding, Zhibing Li, Yupeng Chen, Jinlu Qu

摘要:

利用\textit{Rossi X-ray Timing Explorer}的观测资料,对吸积毫秒X射线脉冲星SAX~J1748.9-2021在2010年爆发期间的X射线爆发进行了研究。我们发现了13个X射线爆发,包括12个标准型\uppercase \expandafter{\romannumeral1} X射线爆发和一个无冷却尾的不规则X射线爆发。在爆发过程中,持续发射发生在$\sim$(1-5)$\%\rm {\dot{M}_{Edd}}$。我们使用一个组合模型的黑体(BB),幂律,和线组件,以适应持续发射光谱。在组合模型中加入了另一个BB,以解释中子星表面热核燃烧产生的X射线爆发。最后,我们用一个乘法因子$f_{\rm a}$加上一个BB来拟合X射线爆发的光谱,从而修正了组合模型。发现在某些情况下,$f_{\rm a}$与爆发通量呈负相关。分析表明,不规则X射线爆发的点火深度明显小于\uppercase \expandafter{\romannumeral1}型X射线爆发的点火深度。我们认为,探测到的\uppercase型\expandafter{\romannumeral1} X射线爆发起源于富氦或纯氦环境,而不规则的X射线爆发则起源于浅海热核闪光。

英文摘要:

With the observations from \textit{Rossi X-ray Timing Explorer}, we search and study the X-ray bursts of accreting millisecond X-ray pulsar SAX~J1748.9-2021 during its 2010 outburst. We find 13 X-ray bursts, including 12 standard type-\uppercase\expandafter{\romannumeral1} X-ray bursts and an irregular X-ray burst which lacks cooling tail. During the outburst, the persistent emission occurred at $\sim$(1-5)$\%\rm {\dot{M}_{Edd}}$. We use a combination model of a blackbody (BB), a powerlaw, and a line component to fit the persistent emission spectra. Another BB is added into the combination model to account for the emission of the X-ray bursts due to the thermonuclear burning on the surface of the neutron star. Finally, we modify the combination model with a multiplicative factor $f_{\rm a}$, plus a BB to fit the spectra during the X-ray bursts. It is found that the $f_{\rm a}$ is inversely correlated with the burst flux in some cases. Our analysis suggests that the ignition depth of the irregular X-ray burst is obviously smaller than those of the type-\uppercase\expandafter{\romannumeral1} X-ray bursts. We argue that the detected type-\uppercase\expandafter{\romannumeral1} X-ray bursts originate from helium-rich or pure-helium environment, while the irregular X-ray burst originates from the thermonuclear flash in a shallow ocean.

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