用吸积盘模型表征已知最亮类星体SMSS J2157 -3602
Characterising SMSS J2157--3602, the most luminous known quasar, with accretion disc models
摘要：
我们开发了一种吸积盘（AD）拟合方法，利用薄盘模型和马尔可夫链蒙特卡罗方法的贝叶斯推断，在红移处的已知最明亮的类星体SMSS J215728.21-360215.1上进行测试$z=4.692$。AD模型利用近红外光谱和宽波段光度学构造的光谱能量分布，发现黑洞质量为$\log(M_{\rm{AD}}/M_{\odot}) = 10.31^{+0.17}_{-0.14}$，各向异性校正后的热光度为$\log{(L_{\rm{bol}}/\rm{erg\,s^{-1}})} = 47.87 \pm 0.10$，得到爱丁顿比为$0.29^{+0.11}_{-0.10}$，辐射效率为$0.09^{+0.05}_{-0.03}$。使用近红外光谱，我们估计单历元维里黑洞的质量估计为$\log(M_{\rm{SE}}/M_{\odot}) = 10.33 \pm 0.08$，在3000 $\log{(L(\rm{3000\textÅ})/\rm{erg\,s^{-1}})} = 47.66 \pm 0.01$的单色光度。作为一种独立的方法，AD拟合有可能补充单历元维里质量方法，在获得更强的约束性质的大质量类星体黑洞在广泛的红移。
英文摘要：
We develop an accretion disc (AD) fitting method, utilising thin and slim disc models and Bayesian inference with the Markov-Chain Monte-Carlo approach, testing it on the most luminous known quasar, SMSS J215728.21-360215.1, at redshift $z=4.692$. With a spectral energy distribution constructed from near-infrared spectra and broadband photometry, the AD models find a black hole mass of $\log(M_{\rm{AD}}/M_{\odot}) = 10.31^{+0.17}_{-0.14}$ with an anisotropy-corrected bolometric luminosity of $\log{(L_{\rm{bol}}/\rm{erg\,s^{-1}})} = 47.87 \pm 0.10$, and derive an Eddington ratio of $0.29^{+0.11}_{-0.10}$ as well as a radiative efficiency of $0.09^{+0.05}_{-0.03}$. Using the near-infrared spectra, we estimate the single-epoch virial black hole mass estimate to be $\log(M_{\rm{SE}}/M_{\odot}) = 10.33 \pm 0.08$, with a monochromatic luminosity at 3000Å of $\log{(L(\rm{3000\textÅ})/\rm{erg\,s^{-1}})} = 47.66 \pm 0.01$. As an independent approach, AD fitting has the potential to complement the single-epoch virial mass method in obtaining stronger constraints on properties of massive quasar black holes across a wide range of redshifts.
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