喷流活动星系核中最重超大质量黑洞的演化
The evolution of the heaviest super-massive black-holes in jetted AGNs
摘要：
我们呈现了位于喷射活动银河核（AGN）中的最大质量（M $\geq10^9$ M $_{\odot}$）黑洞的空间密度演化，从z = 1.5到z = 5.5。分析是基于从宇宙透镜全天巡天（CLASS）获得的380个亮度选择的（$λ$ L $_{1350}\geq10^{46}$ erg s $^{-1}$和P $_{5\text{GHz}}\geq10^{27}$ W Hz $^{-1}$）平谱射电类星体（FSRQ）的样本。已知这些源是正面喷流的活动星系核（即耀变体），可以利用几何参数来推断所有（未对准的）喷流活动星系核的丰度。然后，我们比较了空间密度的最大规模的SMBH托管在喷流活动星系核与那些存在于总人口（主要由非喷流活动星系核）。我们发现，空间密度在$z\sim3$处有一个峰值，这个峰值明显大于具有相似光学/紫外光度的活动星系核总体观测值（$z\sim2.2$），但不像以前从X射线选择耀变体（$z\gtrsim4$）中推断的那样极端。在洛仑兹体积因子$Γ\approx5$的假设下，喷流活动星系核的比例（喷流活动星系核/总活动星系核）总体上与局域宇宙（10 - 20%）和高红移的估算值一致。最后，我们发现在喷射分数在高红移（$\sim2$的一个因素）的边际减少。所有这些证据都表明，喷流活动星系核的演化路径与活动星系核的总体演化路径不同。
英文摘要：
We present the space density evolution, from z=1.5 up to z=5.5, of the most massive (M$\geq10^9$M$_{\odot}$) black holes hosted in jetted Active Galactic Nuclei(AGNs). The analysis is based on a sample of 380 luminosity-selected ($λ$L$_{1350}\geq10^{46}$ erg s$^{-1}$ and P$_{5\text{GHz}}\geq10^{27}$ W Hz$^{-1}$) Flat Spectrum Radio Quasars (FSRQs) obtained from the Cosmic Lens All Sky Survey (CLASS). These sources are known to be face-on jetted AGNs (i.e. blazars) and can be exploited to infer the abundance of all the (misaligned) jetted AGNs, using a geometrical argument. We then compare the space density of the most massive SMBHs hosted in jetted AGNs with those present in the total population (mostly composed by non-jetted AGNs). We find that the space density has a peak at $z\sim3$, which is significantly larger than the value observed in the total AGN population with similar optical/UV luminosities ($z\sim2.2$), but not as extreme as the value previously inferred from X-ray selected blazars ($z\gtrsim4$). The jetted fraction (jetted AGNs/total AGNs) is overall consistent with the estimates in the local Universe (10--20\%) and at high redshift, assuming Lorentz bulk factors $Γ\approx5$. Finally, we find a marginal decrease in the jetted fraction at high redshifts (by a factor of $\sim2$). All these evidences point toward a different evolutionary path in the jetted AGNs compared to the total AGN population.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
