COSMOLOGICAL TIME DILATION IN DURATIONS OF SWIFT LONG GAMMA-RAY BURSTS
COSMOLOGICAL TIME DILATION IN DURATIONS OF SWIFT LONG GAMMA-RAY BURSTS
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DOI：
10.1088/2041-8205/778/1/l11
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Fu-Wen Zhang;Yizhong Fan;L. Shao;D. Wei
中科院分区：
文献类型：
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作者：
Fu-Wen Zhang;Yizhong Fan;L. Shao;D. Wei
宇宙学时间膨胀是膨胀宇宙中的一个基本现象，它强调从红移z的遥远物体发出的光的持续时间和波长在观测者处将被膨胀1 + z倍。利用139个已知红移（z ≥ 8.2）的Swift长γ射线暴的样本，我们测量了观测能量范围在140/（1 + z）keV和350/（1 + z）keV之间的观测持续时间（T90），对应于静止坐标系中140-350 keV的固定能量范围。我们得到持续时间和因子1 + z之间的显著相关性，即，T90 = 10.5（1 + z）0.94 ± 0.26，这与宇宙学时间膨胀效应的预期一致。
Cosmological time dilation is a fundamental phenomenon in an expanding universe, which stresses that both the duration and wavelength of the emitted light from a distant object at the redshift z will be dilated by a factor of 1 + z at the observer. By using a sample of 139 Swift long gamma-ray bursts with known redshift (z ⩽ 8.2), we measure the observed duration (T90) in the observed energy range between 140/(1 + z) keV and 350/(1 + z) keV, corresponding to a fixed energy range of 140–350 keV in the rest frame. We obtain a significant correlation between the duration and the factor 1 + z, i.e., T90 = 10.5(1 + z)0.94 ± 0.26, which is consistent with that expected from the cosmological time dilation effect.