论文标题
关于AGN遮挡和X射线光度函数的宇宙演变：XMM-Newton和Chandra光谱分析31.3 ver $^2 $条纹82X
On the cosmic evolution of AGN obscuration and the X-ray luminosity function: XMM-Newton and Chandra spectral analysis of the 31.3 deg$^2$ Stripe 82X
论文作者
论文摘要
我们介绍了31.3 v $^2 $ Stripe-82X（S82X）字段中XMM和Chandra观测值的X射线光谱分析。在该领域的6181 X射线源中，我们分析了2937个活性银河核（AGN）的样品，具有固体红移和由模拟确定的足够计数。我们的结果显示了一个中位值的中位数为频谱索引$γ= 1.94 _ { - 0.39}^{+0.31} $，列密度log $ \，n _ {\ mathrm {h}}/\ mathrm {cm mathrm {cm}^{ - 2} = 20.7 _ = 20.7 _ { - 0.5}^{ - { - 0.5}^^^^^}^^^}^^} de-absorbed，2-10 keV光度日志$ \，l _ {\ mathrm {x}}}/\ mathrm {erg \，s}^{ - 1} = 44.0 _ { - 1.0}^{ - 1.0}^{+0.7} $，在redshift范围0-4中。我们得出了被遮盖的AGN的内在分数（$ 22 \ leq \ Mathrm {log} \，n _ {\ Mathrm {h}}/\ Mathrm {cm}^{ - 2} <24美元），发现与Redshift and Scled lumin sewshift and lumin seplation and s Live and a lumin and a lumin sewshift and s lumin and s lumin clisting and s lumin sewss agn。对于log $ \，l _ {\ mathrm {x}}}/\ mathrm {erg {erg \，s}^{ - 1}> 43 $，平均模糊的AGN分数为$ 57 \ pm4 \％$ $ $ $ $ $。 This work constrains the AGN obscuration and spectral shape of the still uncertain high-luminosity and high-redshift regimes (log$\,L_{\mathrm{X}}/\mathrm{erg\,s}^{-1}>45.5$, $z>3$), where the obscured AGN fraction rises to $64\pm12\%$.我们报告了X射线光度功能的光度和密度演变，在$ z> 2 $的所有亮度下，AGN占主导地位，并在log $ \，l _ {\ mathrm {x}}}}/\ mathrm {erg {erg {erg {erg \ s}^，s}^{-1}> 45 $ at的log $ \，l _ {\ mathrm {x}}}/\ mathrm {我们的结果与进化模型一致，其中大部分AGN活性是由气体丰富的环境触发的，并且在缩小尺寸的情况下。同样，发现黑洞积聚密度（BHAD）与恒星形成速率密度相似，从而证实了AGN和宿主 - 甘马克斯之间的共同进化，但暗示了其不断增长的历史的不同时间尺度。派生的Bhad进化表明，康普顿厚的AGN与所有其他AGN种群的总和一样，有助于AGN的积聚史。
We present X-ray spectral analysis of XMM and Chandra observations in the 31.3 deg$^2$ Stripe-82X (S82X) field. Of the 6181 X-ray sources in this field, we analyze a sample of 2937 active galactic nuclei (AGN) with solid redshifts and sufficient counts determined by simulations. Our results show a population with median values of spectral index $Γ=1.94_{-0.39}^{+0.31}$, column density log$\,N_{\mathrm{H}}/\mathrm{cm}^{-2}=20.7_{-0.5}^{+1.2}$ and intrinsic, de-absorbed, 2-10 keV luminosity log$\,L_{\mathrm{X}}/\mathrm{erg\,s}^{-1}=44.0_{-1.0}^{+0.7}$, in the redshift range 0-4. We derive the intrinsic fraction of AGN that are obscured ($22\leq\mathrm{log}\,N_{\mathrm{H}}/\mathrm{cm}^{-2}<24$), finding a significant increase in the obscured AGN fraction with redshift and a decline with increasing luminosity. The average obscured AGN fraction is $57\pm4\%$ for log$\,L_{\mathrm{X}}/\mathrm{erg\,s}^{-1}>43$. This work constrains the AGN obscuration and spectral shape of the still uncertain high-luminosity and high-redshift regimes (log$\,L_{\mathrm{X}}/\mathrm{erg\,s}^{-1}>45.5$, $z>3$), where the obscured AGN fraction rises to $64\pm12\%$. We report a luminosity and density evolution of the X-ray luminosity function, with obscured AGN dominating at all luminosities at $z>2$ and unobscured sources prevailing at log$\,L_{\mathrm{X}}/\mathrm{erg\,s}^{-1}>45$ at lower redshifts. Our results agree with evolutionary models in which the bulk of AGN activity is triggered by gas-rich environments and in a downsizing scenario. Also, the black hole accretion density (BHAD) is found to evolve similarly to the star formation rate density, confirming the co-evolution between AGN and host-galaxy, but suggesting different time scales in their growing history. The derived BHAD evolution shows that Compton-thick AGN contribute to the accretion history of AGN as much as all other AGN populations combined.
