THE PROPERTIES OF CROSS-CORRELATION AND SPECTRA OF THE LOW-MASS X-RAY BINARY 4U 1608-52

THE PROPERTIES OF CROSS-CORRELATION AND SPECTRA OF THE LOW-MASS X-RAY BINARY 4U 1608-52
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低质量X射线双星4U 1608-52的互相关特性和光谱

DOI:
10.1088/0004-6256/147/3/67
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发表时间:
2013-09
影响因子:
5.3
通讯作者:
Yong-Heng Zhao
Yong-Heng Zhao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hao-Tong Zhang;Zhi-Bing Li;Cheng-Min Zhang;Yong-Heng Zhao

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利用RXTE数据,分析了瞬变环礁源4U 1608-52的软、硬X射线之间的互相关函数。我们在1998年、2002年和2010年的三次爆发中发现了反相关性,在后两次爆发中发现了数百秒的显著时间滞后。我们的研究结果表明,软,硬X射线之间没有相关性,在极端的岛屿状态和一个占主导地位的正相关性,在较低的香蕉状态。2010年爆发的反相关性呈现在上香蕉状态,而另外两次爆发的反相关性呈现在岛和左下香蕉状态。到目前为止,对于环礁源,仅对4U 1735-44的互相关进行了统计研究,其中反相关出现在上香蕉状态。在这里,我们对4U 1608-52的研究在2010年的爆发中提供了类似的结果。此外,我们还注意到1998年和2002年爆发的香蕉区上部光度是2010年爆发的1.5倍,而2010年爆发的香蕉区上部光度接近4U 1735-44。结果表明,源的色-色图中的态可以与源的亮度相关联。在2010年爆发期间的进一步光谱分析也显示,这表明,磁盘可以在上香蕉有点截断。上香蕉区的特征与Z源中的外展分支的结果相似。
With RXTE data, we analyzed the cross-correlation function between the soft and hard X-rays of the transient atoll source 4U 1608-52. We found anti-correlations in three outbursts occurred in 1998, 2002, and 2010, and we found significant time lags of several hundreds of seconds in the latter two outbursts. Our results show no correlation between the soft and hard X-rays in the extreme island state and a dominated positive correlation in the lower banana state. Anti-correlations are presented at the upper banana state for the outburst of 2010 and at the island and the lower left banana states for the other two outbursts. So far for atoll sources, the cross-correlation has been studied statistically only for 4U 1735-44, where anti-correlations showed up in the upper banana state. Here our investigation on 4U 1608-52 provides a similar result in its 2010 outburst. In addition, we notice that the luminosities in the upper banana of the 1998 and 2002 outbursts are about 1.5 times that of the 2010 outburst whose luminosity in the upper banana is close to that of 4U 1735-44. The results suggest that the states in the color–color diagram of a source could be correlated with the luminosity of the source. A further spectral analysis during the 2010 outburst is also shown, which suggests that the disk can be a little truncated in the upper banana. The feature on the upper banana is similar to the previous results of the flaring branch in Z sources.
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