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首页> 外文期刊>The Astrophysical journal >Timing and spectral studies of LMC X-4 in high and low states with BeppoSAX: Detection of pulsations in the soft spectral component
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Timing and spectral studies of LMC X-4 in high and low states with BeppoSAX: Detection of pulsations in the soft spectral component

机译：使用BeppoSAX在高低状态下对LMC X-4进行时序和频谱研究：检测软频谱分量中的脉动

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摘要

We report here detailed timing and spectral analysis of two BeppoSAX observations of the binary X-ray pulsar LMC X-4 carried out during the low and high states of its 30.5 day long superorbital period. Timing analysis clearly shows 13.5 s X-ray pulsations in the high state of the superorbital period, which allows us to measure the mideclipse time during this observation. Combining this with two other mideclipse times derived earlier with ASCA, we have derived a new estimate of the orbital period derivative. Pulse-phase-averaged spectroscopy in the high and low states shows that the energy spectrum in the 0.1 - 10 keV band comprises a hard power law, a soft excess, and a strong iron emission line. The continuum flux is found to decrease by a factor of similar to 60 in the low state, while the decrease in the iron-line flux is only by a factor of similar to12, suggesting a different site for the production of the line emission. In the low state, we have not found any significant increase in the absorption column density. The X-ray emission is found to come from a very large region, comparable to the size of the companion star. Pulse-phase - resolved spectroscopy in the high state shows a pulsating nature of the soft spectral component with some phase offset compared to the hard X-rays, as is known in some other binary X-ray pulsars. [References: 22]
机译：我们在这里报告在其30.5天长的超轨道周期的低态和高态期间对二元X射线脉冲星LMC X-4进行的两次BeppoSAX观测的详细定时和频谱分析。时序分析清楚地表明，在超轨道周期的高态下有13.5 s的X射线脉动，这使我们能够在这次观测中测量中蚀时间。将其与之前使用ASCA推导的另外两个中蚀时间相结合，我们得出了轨道周期导数的新估计。高和低状态下的脉冲相位平均光谱显示，在0.1-10 keV波段的能谱包括硬功率定律，软过量和强铁发射谱线。在低状态下，连续通量减少了大约60倍，而铁线通量的减少仅减少了12倍，这表明产生线路发射的位置不同。在低状态下，我们没有发现吸收柱密度有任何显着增加。发现X射线辐射来自非常大的区域，与伴星的大小相当。脉冲相位分辨光谱法在高状态下显示出与硬X射线相比具有一些相位偏移的软光谱分量的脉动性质，这在某些其他二元X射线脉冲星中是已知的。 [参考：22]

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