STATE TRANSITIONS IN BRIGHT GALACTIC X-RAY BINARIES: LUMINOSITIES SPAN BY TWO ORDERS OF MAGNITUDE
STATE TRANSITIONS IN BRIGHT GALACTIC X-RAY BINARIES: LUMINOSITIES SPAN BY TWO ORDERS OF MAGNITUDE
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明亮星系 X 射线双星中的状态转变：光度跨度达到两个数量级
DOI：
10.1088/0004-637x/701/2/1940
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发表时间：
2009-07
影响因子：
4.9
通讯作者：
Yan, Zhen
中科院分区：
文献类型：
--
作者：
Yu, Wenfei;Yan, Zhen
利用Rossi X射线定时探测器上的全天监视器和雨燕上的突发警报望远镜的X射线监测观测，我们能够研究大约20个明亮的持久和瞬态黑洞和中子星星双星中发生的光谱状态转变。我们已经证实，在硬-软跃迁对应的X射线光度和随后的软态的X射线光度之间存在相关性。这种相关性在跨越2个数量级的光度范围内保持不变，没有通量饱和或截止的迹象。我们还发现，在爆发或耀斑的上升阶段，过渡光度与X射线光度的增加率相关，这意味着过渡光度变化的起源与瞬态源和持久源的非稳态吸积有关。软到硬的过渡和前面的软态的峰值亮度的结束对应的亮度之间的相关性被发现是微不足道的。结果表明，当质量吸积率增大时，谱态跃迁的滞后效应主要是由非定常吸积驱动的.我们的研究结果还意味着，银河系X射线双星可以达到更明亮的硬态爆发期间更高的光度和类似的上升时间尺度的观察。根据这些关联，我们推测下个世纪在银河系双星中将观测到超过爱丁顿光度的明亮硬态。我们还认为，附近星系中的一些超亮X射线源在明亮的短耀斑期间保持在硬态，其中含有恒星质量的致密星。
Using X-ray monitoring observations with the All-Sky Monitor on board the Rossi X-Ray Timing Explorer and the Burst Alert Telescope on board the Swift, we are able to study the spectral state transitions occurred in about 20 bright persistent and transient black hole and neutron star binaries. We have confirmed that there is a correlation between the X-ray luminosity corresponding to the hard-to-soft transition and the X-ray luminosity of the following soft state. This correlation holds over a luminosity range spanning by 2 orders of magnitude, with no indication of a flux saturation or cutoff. We have also found that the transition luminosity correlates with the rate of increase in the X-ray luminosity during the rising phase of an outburst or flare, implying that the origin of the variation of the transition luminosity is associated with non-stationary accretion in both transient sources and persistent sources. The correlation between the luminosity corresponding to the end of the soft-to-hard transition and the peak luminosity of the preceding soft state is found insignificant. The results suggest that the hysteresis effect of spectral state transitions is primarily driven by non-stationary accretion when the mass accretion rate increases rather than the mass accretion rate decreases. Our results also imply that Galactic X-ray binaries can reach more luminous hard states during outbursts of higher luminosities and of similar rise timescales as those observed. Based on the correlations, we speculate that bright hard state beyond the Eddington luminosity will be observed in Galactic binaries in the next century. We also suggest that some ultra-luminous X-ray sources in nearby galaxies, which stay in the hard states during bright, short flares, harbor stellar-mass compact stars.
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DOI：
10.1086/167255
发表时间：
1989-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Parmar;M. Gottwald;M. Klis;J. Paradijs
通讯作者：
A. Parmar;M. Gottwald;M. Klis;J. Paradijs
DOI：
10.1086/511819
发表时间：
2006-11
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
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通讯作者：
Jérôme Rodriguez;M. C. Bel;J. Tomsick;S. Corbel;C. Brocksopp;A. Paizis;S. E. Shaw;A. Bodaghee
DOI：
10.1086/176474
发表时间：
1995-11
期刊：
The Astrophysical Journal
影响因子：
--
作者：
P. Massey;Kelsey E. Johnson;K. DeGioia-Eastwood
通讯作者：
P. Massey;Kelsey E. Johnson;K. DeGioia-Eastwood
DOI：
10.1086/338984
发表时间：
2001-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
J. Orosz;P. Groot;M. van der Klis;J. McClintock;Michael R. Garcia;P. Zhao;R. Jain;C. Bailyn;
通讯作者：
J. Orosz;P. Groot;M. van der Klis;J. McClintock;Michael R. Garcia;P. Zhao;R. Jain;C. Bailyn;
DOI：
10.1086/339167
发表时间：
2001-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
David M. Smith;W. Heindl;J. Swank
通讯作者：
David M. Smith;W. Heindl;J. Swank