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

学生将在横跨z=0到z=6的伽马射线暴星系样本上使用大型多波长数据集(光学、近红外、中红外、毫米、无线电)来表征宇宙演化并更好地了解伽马射线暴的起源。在最初的1-2年里，学生将使用这些数据建立光谱能量分布，并将它们与理论模型相匹配，以研究星系群如何随时间演变，并检查它们与深度调查中选择的其他类别星系的联系。他还将比较主体属性和余辉推断属性(例如，推断的金属丰度)，以研究视线属性与综合主体属性之间的相关性。最后，他将使用最近批准的Cycle 26计划中的HST数据，将暗端星系光度函数斜率限制在z=5，并独立测试弱星系是否足以重新电离早期宇宙。

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.