多普勒盘状体层摄影术在低质量AGN自旋中的应用
Doppler disc tomography applied to low mass AGN spin
摘要：
多普勒层析成像可以提供一个强有力的手段来确定黑洞自旋时，我们的看法，中央地区的显示和模糊的光学厚轨道材料，并可以提供一个独立的估计，不遭受许多退化的传统方法。对于低质量活动星系核，随时间变化的遮蔽预计会在延伸到软X射线带通的圆盘发射的变化光谱中留下签名。我们创建了一个频谱模型，将多普勒层析成像，并将其应用到低质量（8 $\times$ 10 $^{5}$ M $_{\odot}$）活动星系核，RX J1301.9+2747的情况下，它显示出不寻常的时间属性的形式，我们认为是最好的解释，通过光学厚风的窗口的轨道的短命耀斑。在最高数据质量的耀斑过程中模拟相位分辨光谱表明，即使当我们放松限制时，自旋也非常低。这是第一个通过这种技术测量自旋的最低质量活动星系核。我们注意到，由于质量和自旋都很低，这似乎有利于超大质量黑洞（SMBH）的增长混乱，而不是恒定的吸积。
英文摘要：
Doppler tomography can provide a powerful means of determining black hole spin when our view to the central regions are revealed and obscured by optically thick orbiting material, and can provide an independent estimate that does not suffer as many degeneracies as traditional methods. For low mass AGN, time-dependent obscuration is expected to leave a signature in the changing spectrum of the disc emission which extends into the soft X-ray bandpass. We create a spectral model incorporating Doppler tomography and apply it to the case of the low mass (8 $\times$ 10$^{5}$ M$_{\odot}$) AGN, RX J1301.9+2747 which shows unusual timing properties in the form of short-lived flares that we argue are best explained by the orbit of a window through an optically thick wind. Modelling the phase-resolved spectrum over the course of the highest data quality flare indicates a very low spin even when we relax our constraints. This is the lowest mass AGN for which a spin has been measured and the first via this technique. We note that, as the mass and spin are very low, this appears to favour supermassive black hole (SMBH) growth by chaotic rather than constant accretion.
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