论文标题
使用星系簇对Amati关系的低红移校准
Low redshift calibration of the Amati relation using galaxy clusters
论文作者
论文摘要
在这项工作中，我们使用具有连接X射线/SZE观察的38个星系簇的角直径距离来绕过伽马射线爆发（GRBS）的AMATI关系中的循环问题。假设宇宙距离双重性关系的有效性，我们获得了与簇角直径距离的发光度距离，并在将GRB红移范围限制为$ z <0.9 $之后，使用两个不同GRB数据集的各向同性等效能量计算。然后，我们检查两个数据集的AMATI关系的有效性。使用Galaxy群集距离作为低频锚的最佳拟合AMATI关系参数与同一数据集的先前估计值一致。我们为两个数据集获得的固有散射约为45％和15％，与用于审查Amati关系的其他距离锚点相当。
In this work, we use angular diameter distances of 38 galaxy clusters with joint X-ray/SZE observation to circumvent the circularity problem in the Amati relation for Gamma-ray Bursts (GRBs). Assuming the validity of cosmic-distance duality relation, we obtain the luminosity distance from the cluster angular diameter distance and use that to calculate the isotropic equivalent energy of two different GRB datasets, after restricting the GRB redshift range to $z<0.9$. We then check the validity of the Amati relation for both these datasets. The best-fit Amati relation parameters using galaxy cluster distances as low-redshift anchors are consistent with a previous estimate for the same dataset. The intrinsic scatter which we obtain for the two datasets is about 45% and 15%, and is comparable with that found by other distance anchors used to vet the Amati relation.
