论文标题
Pan-Starrs1 $ \ Mathbf {Z> 5.6} $ quasar调查：iii。 $ \ mathbf {z \ ot6} $ quasar Luminosity函数
The Pan-STARRS1 $\mathbf{z>5.6}$ Quasar Survey: III. The $\mathbf{z\approx6}$ Quasar Luminosity Function
论文作者
论文摘要
我们根据Pan-Starrs1（PS1）类星体调查提供了$ z \！\！6 $ type-1类星体光度函数（QLF）。 PS1示例包括$ z \ of 55.7-6.2 $的125个类星体，其中$ -28 \ lyseSim m_ {1450} \ Lessim-25 $。在ShellQS调查中的48个Fainter类星体的补充中，我们评估了$ z \ of $ -28 \ -28 \ lyseSim m_ {1450} \ Lessim-22 $。采用具有类星体密度的指数演化的双重力法（$φ（z）\ propto10^{k（z-6）} $; $ k = -0.7 $），我们使用最大似然方法来建模我们的数据。我们发现$ m^*= -26.38 _ { - 0.60}^{+0.79} \，\ text {mag} $的断裂幅度的微弱末端坡度为$α= -1.70 _ { - 0.19} $β= -3.84 _ { - 1.21}^{+0.63} $。基于我们的新QLF模型，我们确定$ z \！\！6 $以$ n（m_ {1450} <-26）= 1.16 _ { - 0.12}^{+0.13} {+0.13} \，\，\，\ text {cgpc}^{ - 3} $。与文献相比，我们发现类星体密度从$ z \ of yout7 $到$ z \ oft4 $的恒定值$ k \ \ 0.7 $。此外，我们得出了$ε_{912}（z = 6）= 7.23 _ { - 1.02}^{+1.65} \ times的电离发射率10^{22} \，\ text {erg} \，\ text {s}^{ - 1} \ text {hz}^{ - 1} \ text {cmpc}^{ - 3} $基于qlf测量。给定标准假设和最近对Becker等人的平均自由路径的测量。 （2021）在$ z \ of6 $时，我们计算了$γ_ {\ text {hi}}}}（z {=} 6）\ 6 \ times10^{ - 16} \，\ text {s} {s}^{ - 1} $，强烈地不利于Quasars of Hydrogen of Quasars nydrogen的Hydrogen reporgon。
We present the $z\!\approx\!6$ type-1 quasar luminosity function (QLF) based on the Pan-STARRS1 (PS1) quasar survey. The PS1 sample includes 125 quasars at $z\approx5.7-6.2$ with $-28\lesssim M_{1450}\lesssim-25$. Complemented by 48 fainter quasars from the SHELLQs survey, we evaluate the $z\approx6$ QLF over $-28\lesssim M_{1450}\lesssim-22$. Adopting a double power law with an exponential evolution of the quasar density ($Φ(z)\propto10^{k(z-6)}$; $k=-0.7$), we use a maximum likelihood method to model our data. We find a break magnitude of $M^*=-26.38_{-0.60}^{+0.79}\,\text{mag}$, a faint end slope of $α=-1.70_{-0.19}^{+0.29}$, and a steep bright end slope with $β=-3.84_{-1.21}^{+0.63}$. Based on our new QLF model we determine the quasar comoving spatial density at $z\!\approx\!6$ to be $n( M_{1450}<-26)=1.16_{-0.12}^{+0.13}\,\text{cGpc}^{-3}$. In comparison with the literature, we find the quasar density to evolve with a constant value of $k\approx-0.7$ from $z\approx7$ to $z\approx4$. Additionally, we derive an ionizing emissivity of $ε_{912}(z=6) =7.23_{-1.02}^{+1.65}\times 10^{22}\,\text{erg}\,\text{s}^{-1}\text{Hz}^{-1}\text{cMpc}^{-3}$ based on the QLF measurement. Given standard assumptions and the recent measurement of the mean free path of Becker et al. (2021) at $z\approx6$ we calculate an HI photoionizing rate of $Γ_{\text{HI}}(z{=}6) \approx 6 \times10^{-16}\,\text{s}^{-1}$, strongly disfavoring a dominant role of quasars in hydrogen reionization.
