The Host Galaxies of Long-Duration Gamma-Ray Bursts as High-Redshift Cosmological Probes

学生将使用大型多波长数据集（光学，近红外，中红外，毫米，无线电）的伽马射线爆发星系样本跨越z=0到z=6，以表征宇宙演化和更好地了解伽马射线爆发的起源。在最初的1-2年，学生将使用这些数据建立光谱能量分布，并将其拟合到理论模型中，以研究人口如何随时间演变，并检查它们与深空调查中选择的其他类别星系的联系。他还将比较主机属性与余辉推断属性（例如推断金属丰度），以研究视线属性与综合主机属性之间的相关性。最后，他将使用最近批准的第26周期计划的HST数据来限制z=5处的暗端星系光度函数斜率，并独立测试暗星系是否足以恢复早期宇宙。

The student will use large multi-wavelength data sets (optical, NIR, mid-IR, millimeter, radio) on a sample of gamma-ray bursts galaxies spanning z=0 to z=6 to characterize cosmic evolution and better understand the origins of gamma-ray bursts. Over the first 1-2 years the student will build spectral energy distributions using these data and fit them to theoretical models to study how the population evolves with time and examine their connection to other classes of galaxies selected in deep surveys. He will also compare host properties to afterglow-inferred properties (e.g. inferred metallicity) to study correlations between sightline properties with integrated host properties. Finally, he will employ HST data from a recently-approved Cycle 26 program to constrain the faint-end galaxy luminosity function slope at z=5 and independently test whether faint galaxies were sufficient to reionize the early universe.