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arXiv 1506.04524astro-ph.HE
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Mrk 335相对论反射的同时光谱和混响建模

Simultaneous spectral and reverberation modelling of relativistic reflection in Mrk 335

P. Chainakun, A. J. Young

摘要:

我们提出了一个X射线光谱和定时模型来研究在Mrk 335的高通量状态中看到的宽而可变的铁线。该模型由一个可变的X射线源定位沿旋转轴的黑洞,照亮吸积盘产生背散射,电离反射光谱。我们计算的时间滞后,包括充分稀释的影响,并执行2-10 keV的频谱和频率相关的时间滞后的2.5-4与4-6.5 keV频带的同时拟合。最佳拟合参数与黑洞的质量约为1.3 × 10^7太阳质量,盘倾角为45度,直接连续区的光子指数为2.4相一致。铁的丰度为0.5,电离参数在盘的最内部为10^3 erg cm / s,并在进一步向外减小。X射线源高度很小,约为2 rg。此外,我们同时拟合的Fe L滞后与0.3-10 keV的光谱。关键参数与先前获得的参数相当。我们还报告的差异低于2千电子伏使用xillver和reflionx模型,这可能会影响软过剩的解释。虽然同时拟合光谱和定时数据可以打破源高度和黑洞质量之间的简并,我们发现,源高度和中心质量的测量显着依赖于光盘的电离状态,并可能依赖于模型。

英文摘要:

We present an X-ray spectral and timing model to investigate the broad and variable iron line seen in the high flux state of Mrk 335. The model consists of a variable X-ray source positioned along the rotation axis of the black hole that illuminates the accretion disc producing a back-scattered, ionized reflection spectrum. We compute time lags including full dilution effects and perform simultaneous fitting of the 2-10 keV spectrum and the frequency-dependent time lags of 2.5-4 vs. 4-6.5 keV bands. The best-fitting parameters are consistent with a black hole mass of approximately 1.3 x 10^7 M_sun, disc inclination of 45 degrees and the photon index of the direct continuum of 2.4. The iron abundance is 0.5 and the ionization parameter is 10^3 erg cm / s at the innermost part of the disc and decreases further out. The X-ray source height is very small, approximately 2 r_g. Furthermore, we fit the Fe L lags simultaneously with the 0.3-10 keV spectrum. The key parameters are comparable to those previously obtained. We also report the differences below 2 keV using the xillver and reflionx models which could affect the interpretation of the soft excess. While simultaneously fitting spectroscopic and timing data can break the degeneracy between the source height and the black hole mass, we find that the measurements of the source height and the central mass significantly depend on the ionization state of the disc and are possibly model-dependent.

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