论文标题
高红移星系光度函数的重力透镜修饰
Gravitational lensing modification of the high redshift galaxy luminosity function
论文作者
论文摘要
高红移星系的其余框UV光度函数（UVLF）的明亮末端通过重力透镜放大偏置修饰。由于最近发现JWST非常高Z星系的发现，我们研究了放大偏见对源源的有限尺寸的依赖性，价格为$ 6 <z <14 $。我们计算放大概率分布，并使用这些分布来计算放大偏置，假设REDSHIFT $ 6 <z <14 $的星系中的REST框架Schechter UVLF。我们发现，明亮的高红移星系的有限尺寸以及镜头椭圆度显着抑制了放大偏置，从而产生了观察到的明亮端，比点源假设所产生的幂律更急剧下降。通过假设源总数具有亮度大小的关系，并与Harikane+（2022）的观察到的$ z = 6 $ Galaxy Luminosision函数进行比较，我们表明，UVLF可用于对星系内固有大小进行温和约束，与较小的星系相比，与较小的构图相关相关。将来，使用Euclid和Roman Space望远镜的广泛调查将对更强的约束。我们还将可能的最大放大倍数列为源大小和镜头椭圆度的函数。
The bright end of the rest-frame UV luminosity function (UVLF) of high-redshift galaxies is modified by gravitational lensing magnification bias. Motivated by recent discoveries of very high-z galaxies with JWST, we study the dependence of magnification bias on the finite size of sources at $6<z<14$. We calculate the magnification probability distributions and use these to calculate the magnification bias assuming a rest-frame Schechter UVLF for galaxies at redshift $6<z<14$. We find that the finite size of bright high-redshift galaxies together with lens ellipticity significantly suppresses magnification bias, producing an observed bright end which declines more sharply than the power-law resulting from assumption of point sources. By assuming a luminosity-size relation for the source population and comparing with the observed $z=6$ galaxy luminosity function from Harikane+(2022), we show that the UVLF can be used to set mild constraints on the galaxies intrinsic size, favoring smaller galaxies compared to the fiducial luminosity-size relation. In the future, wide surveys using Euclid and Roman Space Telescope will place stronger constraints. We also tabulate the maximum magnification possible as a function of source size and lens ellipticity.
