Distribution of distant galaxy size and luminosity

我曾利用JSPS Grant-in-Aid支持研究早期宇宙（即再电离时代）明亮星系的尺寸-光度比例关系，了解黑洞质量引力波数据的质量分布。我使用基于全新太空望远镜JWST的观测数据进行了分析。该数据来自JWST早期发布的科学项目之一，使我们首次探测到高红移星系的形态和尺度关系。我们发现，高红移星系的大小随波长的变化并不显著，即从静止框架紫外到光学。我们还在静帧紫外波段发现了一个暂时性的更陡的尺寸-光度关系斜率，这表明暗星系的尺寸非常小。此外，我还研究了引力透镜效应对黑洞质量分布函数的影响，发现目前引力透镜效应的影响是不显著的。综上所述，我的主要研究成果是首次研究了z>7的静帧光学尺寸-光度关系，对理解早期宇宙中星系的形态和尺度关系做出了重要贡献。

I have used the JSPS Grant-in-Aid to support research on the size-luminosity scaling relation of bright galaxies in the early Universe (i.e., reionization epoch), and understand the mass distribution of the black hole mass-based gravitational wave data. I performed the analysis using the observation data based on the brand-new space telescope JWST. The data is from one of the early release science projects of JWST, and enable us to probe the high redshift galaxy’s morphology and scaling relation for the first time. We found that the size of high redshift galaxies does not vary significantly as a function of wavelength, i.e., from rest-frame UV to optical. We also detected a tentative steeper slope of size-luminosity relation at the rest-frame UV band which indicates that the faint galaxies have extremely small sizes. Furthermore, I also investigated the impact of gravitational lensing on the black hole mass distribution function, and found the current influence from lensing is insignificant. In summary, my main research outcome is the first study of rest-frame optical size-luminosity relation at z>7, and it has made significant contributions understand the galaxy’s morphology and scaling relation in early Universe.