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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Luminosity dependence of the electron temperature in the bright hard state of the black hole candidate GX 339-4
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Luminosity dependence of the electron temperature in the bright hard state of the black hole candidate GX 339-4

机译:黑洞候选GX 339-4在亮硬状态下电子温度的光度依赖性

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摘要

We have analyzed 200 Rossi X-ray Timing Explorer observations of the black hole candidate GX 339-4, all from bright hard state periods between 1996 and 2005. The purpose of our study is to investigate the radiation mechanisms in the hard state of GX 339-4. The broadband 3-200keV spectra were successfully modeled by a simple analytic model, power-law with an exponential cut-off modified with a smeared edge. The obtained energy cut-off (E-cut) was distributed over 50-200 keV, and the photon index over 1.4-1.7. We found a clear anti-correlation (E-cut alpha L-0.70 +/- 0.06) between the X-ray luminosity (L) in 2-200 keV and E-cut, when L is larger than 7 x 10(37) erg s(-1) (assuming a distance of 8 kpc), while E-cut is roughly constant at around 200 keV when L is smaller than 7 x 10(37) ergs(-1). This anti-correlation remained unchanged by adopting a more physical thermal Comptonization model, which resulted in an anti-correlation that can be expressed as kT(e) alpha L-0.24 +/- 0.06. These anti-correlations can be quantitatively explained by a picture in which the energy-flow rate from protons to electrons balances with inverse Compton cooling.
机译:我们分析了黑洞候选者GX 339-4的200个Rossi X射线Timing Explorer观测值,这些观测值均来自1996年至2005年的明亮硬状态时期。我们的研究目的是研究GX 339硬状态下的辐射机制-4。宽带3-200keV光谱已通过简单的分析模型成功建模,该模型具有幂律定律,并具有带污迹边缘的指数截止。所获得的能量截止(E截止)分布在50-200 keV以上,光子指数超过1.4-1.7。当L大于7 x 10(37)时,我们发现2-200 keV中的X射线亮度(L)与E截距之间存在明显的反相关性(E截距alpha L-0.70 +/- 0.06)。 erg s(-1)(假设距离为8 kpc),而当L小于7 x 10(37)ergs(-1)时,E-cut大致恒定在200 keV附近。通过采用更物理的热Comptonization模型,此反相关性保持不变,从而产生了可表示为kT(e)alpha L-0.24 +/- 0.06的反相关性。这些反相关关系可以通过一张图片进行定量解释,在这张图片中,从质子到电子的能量流率与逆康普顿冷却相平衡。

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