SS 433 X射线谱中的超临界盘漏斗辐射证据
Evidences of the supercritical disc funnel radiation in X-ray spectra of SS 433
摘要：
我们用一个标准的冷却和辐射冷却X射线射流模型分析了SS 433的XMM-牛顿谱。多温度热喷流模型再现了观测到的最强发射线通量。热模型不能单独再现连续辐射的XMM光谱范围内，荧光铁线和一些广泛的光谱特征。利用热喷流加反射模型，我们发现了一个显着的贡献电离反射的光谱范围内的能量从~3至12 keV。反射表面高度电离（xi ~300），照明辐射光谱平坦，可能被强烈吸收。我们得出结论，反射光谱是超临界圆盘漏斗的证据，其中照明辐射来自更深的漏斗区域，在外部可见漏斗壁（r >~2*10^11 cm）中进一步反射。我们没有发现任何反射的证据，在软0.8-2 keV的能量范围内，相反，检测到一个软过剩，这并不依赖于热喷流模型的细节。这种软成分可能被证明是可见漏斗壁的直接辐射。它可以用黑体辐射表示，温度约为0.1 keV，亮度约为L_bb ~3*10^37 erg/s，也可以用多色漏斗（MCF）模型表示。软频谱分量的参数与ULX中的参数大致相同。
英文摘要：
We have analysed the XMM-Newton spectra of SS 433 using a standard model of adiabatically and radiatively cooling X-ray jets. The multi-temperature thermal jet model reproduces well the strongest observed emission line fluxes. The thermal model alone can not reproduce the continuum radiation in the XMM spectral range, the fluorescent iron line and some broad spectral features. Using the thermal jet-plus-reflection model, we find a notable contribution of ionized reflection to the spectrum in the energy range from ~3 to 12 keV. The reflecting surface is highly ionized (xi ~300), the illuminating radiation spectrum is flat and probably strongly absorbed. We conclude that the reflected spectrum is an evidence of the supercritical disc funnel, where the illuminating radiation comes from deeper funnel regions, to be further reflected in the outer visible funnel walls (r >~2*10^11 cm). We have not found any evidences of reflection in the soft 0.8-2 keV energy range, instead, a soft excess is detected, that does not depend on the thermal jet model details. This soft component might prove to be the direct radiation of the visible funnel wall. It is represented here either as black body radiation with the temperature of ~0.1 keV and luminosity of L_bb ~3*10^37 erg/s, or with a multicolour funnel (MCF) model. The soft spectral component has about the same parameters as those found in ULXs.
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