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arXiv 1705.04546astro-ph.HE
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黑洞X射线双星XTE J1859 +226的互相关和时滞研究

A study of the cross-correlation and time lag in black hole X-ray binary XTE J1859+226

Songpeng Pei, Guoqiang Ding, Zhibing Li, Yajuan Lei, Rai Yuen, Jinlu Qu

摘要:

利用Rossi X射线定时探测器(RXTE)的观测数据,系统地研究了黑洞X射线双星(BHXB)XTE J1859+226在1999-2000年爆发期间166天内各光谱态的互相关和时间滞后。反相关和正相关以及它们各自的软、硬X射线滞后只在爆发的前100天内被探测到,此时光度较高。这表明互相关可能与高亮度有关。在XTE J1859+226的每个状态中都检测到正相关,即,硬态、硬中间态(HIMS)、软中间态(SIMS)和软态。然而,仅在HIMS和SIMS中检测到反相关,仅在SIMS中检测到反相关硬滞后,而在HIMS和SIMS两者中均检测到反相关软滞后。此外,在XTE J1859+226中检测到的具有反相关软滞后与硬滞后的观测值之比与中子星低质量X射线双星(NS LMXB)中的观测值之比有显著的不同。到目前为止,在BHXB的软状态中从未检测到反相关,但在NS LMXB的每个分支或状态中检测到反相关。这可能是由于BHXB中软种子光子的起源局限于吸积盘,而对于NS LMXB,来自吸积盘和NS表面。我们注意到,在XTE J1859+226中检测到的反相关时间滞后的时间尺度与其他BHXB和NS LMXB相似。我们认为BHXB中检测到的反相关软滞后可能是由于吸积盘和NS LMXB中的涨落引起的。

英文摘要:

With Rossi X-ray Timing Explorer (RXTE) data, we systematically study the cross-correlation and time lag in all spectral states of black hole X-ray binary (BHXB) XTE J1859+226 in detail during its entire 1999-2000 outburst that lasted for 166 days. Anti-correlations and positive correlations and their respective soft and hard X-ray lags are only detected in the first 100 days of the outburst when the luminosity is high. This suggests that the cross-correlations may be related to high luminosity. Positive correlations are detected in every state of XTE J1859+226, viz., hard state, hard-intermediate state (HIMS), soft-intermediate state (SIMS) and soft state. However, anti-correlations are only detected in HIMS and SIMS, anti-correlated hard lags are only detected in SIMS, while anti-correlated soft lags are detected in both HIMS and SIMS. Moreover, the ratio of the observations with anti-correlated soft lags to hard lags detected in XTE J1859+226 is significantly different from that in neutron star low-mass X-ray binaries (NS LMXBs). So far, anti-correlations are never detected in the soft state of BHXBs but detected in every branch or state of NS LMXBs. This may be due to the origin of soft seed photons in BHXBs is confined to the accretion disk and, for NS LMXBs, from both accretion disk and the surface of the NS. We notice that the timescale of anti-correlated time lags detected in XTE J1859+226 is similar with that of other BHXBs and NS LMXBs. We suggest that anti-correlated soft lag detected in BHXB may result from fluctuation in the accretion disk as well as NS LMXB.

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