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arXiv 0712.0455astro-ph
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GRS 1915+105的两年INTEGRAL监测第2部分:X射线光谱-时间分析

Two Years of INTEGRAL monitoring of GRS 1915+105 Part 2: X-Ray Spectro-Temporal Analysis

J. Rodriguez, S. E. Shaw, D. C. Hannikainen, T. Belloni, S. Corbel, M. Cadolle Bel, J. Chenevez, L. Prat, P. Kretschmar, H. J. Lehto, I. F. Mirabel, A. Paizis, … 展开作者

J. Rodriguez, S. E. Shaw, D. C. Hannikainen, T. Belloni, S. Corbel, M. Cadolle Bel, J. Chenevez, L. Prat, P. Kretschmar, H. J. Lehto, I. F. Mirabel, A. Paizis, G. Pooley, M. Tagger, P. Varniere, C. Cabanac, O. Vilhu

摘要:

这是用\integral、\rxte和赖尔望远镜对GRS 1915+105进行两年监测的第二篇论文。我们提出的X射线光谱和时间分析的四个观测表明,强无线电X射线的相关性。在一次观测中,GRS 1915+105处于稳定状态,而在另外三次观测中,它显示出X射线下降和尖峰(随后是射电耀斑)的周期。我们提出了这些cyclesand的时间分辨光谱表明,在所有情况下,硬X射线组件(康普顿发射从日冕介质)被抑制在符合软X射线尖峰,结束了周期。我们将这些结果解释为软X射线尖峰是抛射的触发器,并且抛射的介质是日冕物质的证据。在稳态观测中,X射线光谱指示硬中间态,在15 GHz处存在相对较强的发射。X射线谱是康普顿化分量和扩展到能量>200 keV的额外幂律的总和,没有任何截止的证据。我们观察到一个可能的相关性的无线电通量的幂律分量,这可能表明,我们看到直接发射的射流在硬X射线能量。我们研究了在硬中间态观测过程中~4 Hz QPO的能量依赖性。QPO-"谱“很好地由幂律模型化,其截止能量约为11 keV,明显不同于康普顿化分量对总通量的相对贡献。这可能会排除康普顿日冕的全球振荡模型。

英文摘要:

(abridged) This is the second paper presenting the results of two years of monitoring of GRS 1915+105 with \integral and \rxte and the Ryle Telescope. We present the X-ray spectral and temporal analysis of four observations which showed strong radio to X-ray correlations. During one observation GRS 1915+105 was in a steady state, while during the three others it showed cycles of X-ray dips and spikes (followed by radio flares). We present the time-resolved spectroscopy of these cyclesand show that in all cases the hard X-ray component (the Comptonized emission from a coronal medium) is suppressed in coincidence with a soft X-ray spike that ends the cycle. We interpret these results as evidence that the soft X-ray spike is the trigger of the ejection, and that the ejected medium is the coronal material. In the steady state observation, the X-ray spectrum is indicative of the hard-intermediate state, with the presence of a relatively strong emission at 15 GHz. The X-ray spectra are the sum of a Comptonized component and an extra power law extending to energies >200 keV without any evidence for a cut-off. We observe a possible correlation of the radio flux with that of the power law component, which may indicate that we see direct emission from the jet at hard X-ray energies. We study the energy dependence of a ~4 Hz QPO during the hard-intermediate state observation. The QPO-``spectrum'' is well modeled by a power law with a cut-off at an energy about 11 keV that clearly differs from the relative contribution of the Comptonized component to the overall flux. This may rule out models of global oscillations of the Compton corona.

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