THE STAR FORMATION RATE IN THE REIONIZATION ERA AS INDICATED BY GAMMA-RAY BURSTS
THE STAR FORMATION RATE IN THE REIONIZATION ERA AS INDICATED BY GAMMA-RAY BURSTS
复制标题
DOI：
10.1088/0004-637x/705/2/l104
复制
发表时间：
2009-06
期刊：
影响因子：
--
通讯作者：
Matthew D. Kistler;H. Yüksel;J. Beacom;Andrew M. Hopkins;J. Wyithe
中科院分区：
文献类型：
--
作者：
Matthew D. Kistler;H. Yüksel;J. Beacom;Andrew M. Hopkins;J. Wyithe
高红移伽马射线暴（GRBs）提供了一个非凡的机会来研究早期宇宙的各个方面，包括宇宙恒星形成率（SFR）。基于最近两个最高z GRB （GRB 080913 at z≃6.7）和GRB 090423 at z≃8.1)，以及4年多的Swift观测，我们首次证实GRB速率不能公正地追踪SFR。对这一点进行修正后，我们发现隐含的SFR大于z = 8与基于Lyman Break星系的测量结果是一致的，在考虑了UV光度函数的暗端看不见的星系之后。我们的研究表明，这为在6 ~ z ~ 8范围内形成的完整恒星提供了证据，证明它足以使宇宙再电离。
High-redshift gamma-ray bursts (GRBs) offer an extraordinary opportunity to study aspects of the early universe, including the cosmic star formation rate (SFR). Motivated by the two recent highest-z GRBs, GRB 080913 at z ≃ 6.7 and GRB 090423 at z ≃ 8.1, and more than four years of Swift observations, we first confirm that the GRB rate does not trace the SFR in an unbiased way. Correcting for this, we find that the implied SFR to beyond z = 8 is consistent with Lyman Break Galaxy-based measurements after accounting for unseen galaxies at the faint end of the UV luminosity function. We show that this provides support for the integrated star formation in the range 6 ≲ z ≲ 8 to have been alone sufficient to reionize the universe.