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arXiv 0704.0467astro-ph
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候选黑洞的吸积盘X射线连续谱模型

Modeling Accretion Disk X-ray Continuum of Black Hole Candidates

Gabor Pszota, Wei Cui

摘要:

我们严格审查与确定的基本属性的黑洞和周围的吸积盘在X射线二进制的基础上建模的磁盘X射线连续的源相关的问题。我们的工作主要基于GX 339-4的两个XMM-牛顿观测,因为它们在低能量(低于1 keV)下提供了高质量的数据,这对于可靠地模拟吸积盘的光谱至关重要。检查的一个关键问题是所谓的“颜色校正因子”的确定,这往往是经验性地引入到占从黑体(由于电子散射)的本地磁盘光谱的偏差。该因子不能在理论上预先确定,因为它可以随着例如,质量吸积率,其中一些重要因素。我们跟进较早的建议,估计颜色校正观测模拟的磁盘光谱饱和康普顿散射。我们表明,光谱可以很好地拟合和该方法产生合理的值的颜色校正因子。为了比较,我们还尝试用其他模型拟合光谱。我们表明,即使是高软态连续(这是占主导地位的磁盘发射)不能令人满意地拟合国家的最先进的磁盘模型。我们讨论了结果的含义。

英文摘要:

We critically examine issues associated with determining the fundamental properties of the black hole and the surrounding accretion disk in an X-ray binary based on modeling the disk X-ray continuum of the source. We base our work mainly on two XMM-Newton observations of GX 339-4, because they provided high-quality data at low energies (below 1 keV) which are critical for reliably modeling the spectrum of the accretion disk. A key issue examined is the determination of the so-called "color correction factor", which is often empirically introduced to account for the deviation of the local disk spectrum from a blackbody (due to electron scattering). This factor cannot be pre-determined theoretically because it may vary with, e.g., mass accretion rate, among a number of important factors. We follow up on an earlier suggestion to estimate the color correction observationally by modeling the disk spectrum with saturated Compton scattering. We show that the spectra can be fitted well and the approach yields reasonable values for the color correction factor. For comparison, we have also attempted to fit the spectra with other models. We show that even the high-soft-state continuum (which is dominated by the disk emission) cannot be satisfactorily fitted by state-of-the-art disk models. We discuss the implication of the results.

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