用伽马射线暴X射线余辉光变曲线约束宇宙学参数
Constraining cosmological parameters by Gamma Ray Burst X - ray afterglow lightcurves
摘要：
本文给出了66个伽马射线暴的哈勃图，这些伽玛暴仅用它们的X射线余辉光变曲线数据导出。为此，我们使用了最近更新的L_X-T_a相关关系，该关系是由Willingale等（2007）模型拟合的Swift伽玛暴样品的光变曲线校准的，它是在T_a处测量的X射线亮度L_X与T_a之间的关系。然后，我们调查使用这个HD约束宇宙学参数时，单独使用或与其他数据相结合，表明使用伽玛暴导致的约束与以前的文献中的结果一致。最后，我们认为，更大样本的高光度伽玛暴可以提供一个有价值的信息，在寻找正确的宇宙学模型。
英文摘要：
We present the Hubble diagram (HD) of 66 Gamma Ray Bursts (GRBs) derived using only data from their X - ray afterglow lightcurve. To this end, we use the recently updated L_X - T_a correlation between the break time T_a and the X - ray luminosity L_X measured at T_a calibrated from a sample of Swift GRBs with lightcurves well fitted by the Willingale et al. (2007) model. We then investigate the use of this HD to constrain cosmological parameters when used alone or in combination with other data showing that the use of GRBs leads to constraints in agreement with previous results in literature. We finally argue that a larger sample of high luminosity GRBs can provide a valuable information in the search for the correct cosmological model.
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