The total rest-frame UV luminosity function from 3 < z < 5: a simultaneous study of AGN and galaxies from -28 < M UV < -16
The total rest-frame UV luminosity function from 3 < z < 5: a simultaneous study of AGN and galaxies from -28 < M UV < -16
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总静止帧 UV 光度函数为 3
DOI：
10.1093/mnras/stad1333
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发表时间：
2023
影响因子：
4.8
通讯作者：
Adams N
中科院分区：
文献类型：
--
作者：
Adams N
我们分别使用96894、38655和7571个光源测量了红移z = 3、z = 4和z = 5的静止坐标系紫外光度函数（LF），以绘制活动星系核（AGN）和再电离期（EoR）后不久的星系主导紫外辐射之间的跃迁。源的选择使用一个全面的光度红移的方法，使用10的HSC和VISTA覆盖的深河外遗留字段。使用跨越0.3 - 2.4 μ m波长范围的模板拟合实现了80 - 90%的完整性，远高于经典的颜色-颜色切割方法。测得的LF包含− 26 <MUV <− 19.25。利用其他研究的补充结果，这一范围进一步扩展到− 28.5 <MUV <− 16，允许同时拟合活动星系核和星系LF的组合。我们发现，在z = 3时，紫外发光星系（MUV <− 22）比z = 4时少，这表明伴随着尘埃遮蔽的广泛猝灭的开始，活动星系核LF的演化非常迅速，它们的数量密度从3 <z <6上升了大约两个数量级。它仍然很难确定，如果一个双幂律函数的形式是首选的Schechter函数来描述星系紫外线LF。估计氢电离光子预算从我们的紫外线LF，我们发现活动星系核可以贡献，但不能单独维持，宇宙的再电离atz = 3 - 5。然而，快速演变的活动星系核LF强烈反对在EoR内的重大贡献。
We present measurements of the rest-frame ultraviolet luminosity function (LF) at redshiftsz= 3,z= 4, andz= 5, using 96894, 38655, and 7571 sources, respectively, to map the transition between active galactic nuclei (AGN) and galaxy-dominated ultraviolet emission shortly after the epoch of reionization (EoR). Sources are selected using a comprehensive photometric redshift approach, using 10of deep extragalactic legacy fields covered by both HSC and VISTA. The use of template fitting spanning a wavelength range of 0.3–2.4μm achieves 80–90 per cent completeness, much higher than the classical colour–colour cut methodology. The measured LF encompasses −26 <MUV< −19.25. This is further extended to −28.5 <MUV< −16 using complementary results from other studies, allowing for the simultaneous fitting of the combined AGN and galaxy LF. We find that there are fewer UV luminous galaxies (MUV< −22) atz∼ 3 thanz∼ 4, indicative of an onset of widespread quenching alongside dust obscuration, and that the evolution of the AGN LF is very rapid, with their number density rising by around two orders of magnitude from 3 <z< 6. It remains difficult to determine if a double power law functional form is preferred over the Schechter function to describe the galaxy UV LF. Estimating the hydrogen ionizing photon budget from our UV LFs, we find that AGN can contribute to, but cannot solely maintain, the reionization of the Universe atz= 3–5. However, the rapidly evolving AGN LF strongly disfavours a significant contribution within the EoR.