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arXiv 0901.0731astro-ph.HE
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由INTEGRAL、RXTE、Swift和XMM/Newton观测到的H1743-322爆发的早期阶段

The early phase of a H1743-322 outburst observed by INTEGRAL, RXTE, Swift, and XMM/Newton

L. Prat, J. Rodriguez, M. Cadolle Bel, E. Kuulkers, M. Hanke, J. Tomsick, S. Corbel, M. Coriat, J. Wilms, A. Goldwurm

摘要:

我们调查的第一个状态变化的早期阶段,在2008年9月至11月爆发的H1743-322,第一次检测到的INTEGRAL卫星。我们分析了INTEGRAL,RXTE,雨燕,和XMM/牛顿观测,它提供了在3-200千电子伏范围内的爆发演化的平静覆盖每隔几天。的能谱很好地拟合由一个唯象模型,包括一个指数截止幂律加上一个磁盘组件。一个更物理的热康普顿化模型(和一个圆盘)同样很好地代表了光谱。在第一阶段(直到MJD 54760),盘的光子指数和温度没有显著变化,并且具有使人联想到硬态(HS)的值。时序分析也与HS的时序分析一致,并且特别显示出相当高的可变性(~30%),以及具有其第一谐波的强~0.5-1 Hz QPO。H1743-322的时间和光谱特征与2003年爆发时的第一颗HS相似。在MJD 54760之后,变软的光谱和~5-6 Hz的QPO表明源经历了到硬中间态(HIMS)的状态转变。我们观察到在这两个国家的QPO频率和光子指数之间的相关性,这表明吸积盘,通常被理解为确定QPO频率,和电晕,这决定了QPO功率之间的强有力的联系。QPO谐波的逐渐消失,以及缓慢减少的硬X射线通量,意味着吸积盘在HS期间逐渐向内移动。

英文摘要:

We investigate the early phase of the first state change during the 2008 September-November outburst of H1743-322, first detected by the INTEGRAL satellite. We analyse INTEGRAL, RXTE, Swift, and XMM/Newton observations, which provide coverage of the quiescence to outburst evolution in the 3-200 keV range every few days. The energy spectra are well fitted by a phenomenological model consisting of an exponentially cut-off power law plus a disc component. A more physical model of thermal Comptonisation (and a disc) represents the spectra equally well. In a first phase (up to MJD 54760), the photon index and temperature of the disc do not vary significantly, and have values reminiscent of the Hard State (HS). The timing analysis is also consistent with that of a HS, and shows in particular a rather high degree of variability (~30%), and a strong ~0.5-1 Hz QPO with its first harmonic. The timing and spectral characteristics of H1743-322 are similar to those of the first HS during its 2003 outburst. After MJD 54760, a change to softer spectra and a ~5-6 Hz QPO indicate that the source underwent a state transition into a Hard-Intermediate State (HIMS). We observe in both states a correlation between the QPO frequency and the photon index, which indicates a strong link between the accretion disc, generally understood to determine the QPO frequency, and the corona, which determines the QPO power. The gradual disappearance of the QPO harmonic, and the slowly decreasing hard X-ray flux, imply that the accretion disc gradually moved inwards during the HS.

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