GRB Cosmology
GRB Cosmology
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发表时间：
2007-06
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通讯作者：
V. Bromm;A. Loeb
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文献类型：
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作者：
V. Bromm;A. Loeb
目前的观测即将为宇宙学的最后前沿打开一扇直接的窗户：宇宙历史上第一个恒星和星系形成的第一个十亿年。甚至在詹姆斯·韦伯太空望远镜发射之前，就有可能利用伽马射线暴（GRB）作为宇宙星星形成和星系际介质（IGM）状态的独特探测器，当第一颗（星族III）恒星形成时，红移高达几十。斯威夫特使命，或未来的卫星，如EXIST，可能是第一个观测到个别第三星族恒星，如果大质量的无金属恒星能够触发伽玛暴。伽玛射线暴余辉发射的光谱跟踪观测将允许探测IGM的电离状态和金属富集作为红移的函数。
Current observations are about to open up a direct window into the final frontier of cosmology: the first billion years in cosmic history when the first stars and galaxies formed. Even before the launch of the James Webb Space Telescope, it might be possible to utilize Gamma-ray Bursts (GRBs) as unique probes of cosmic star formation and the state of the intergalactic medium (IGM) up to redshifts of several tens, when the first (Population III) stars had formed. The Swift mission, or future satellites such as EXIST, might be the first observatories to detect individual Population III stars, provided that massive metal-free stars were able to trigger GRBs. Spectroscopic follow-up observations of the GRB afterglow emission would allow to probe the ionization state and metal enrichment of the IGM as a function of redshift.