STUDY OF POSSIBLE SYSTEMATICS IN THE L*X–T*a CORRELATION OF GAMMA-RAY BURSTS
STUDY OF POSSIBLE SYSTEMATICS IN THE L*X–T*a CORRELATION OF GAMMA-RAY BURSTS
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DOI：
10.1088/0004-637x/730/2/135
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发表时间：
2011-01
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影响因子：
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通讯作者：
M. Dainotti;V. Cardone;S. Capozziello;M. Ostrowski;R. Willingale
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作者：
M. Dainotti;V. Cardone;S. Capozziello;M. Ostrowski;R. Willingale
伽玛射线暴（GRB）是宇宙中能量最高的源，也是已知最远的天体物理源之一。这些特征使它们成为宇宙学应用的标准蜡烛，因此研究发射起源的物理机制及其可观测性质之间的相关性是一项有趣的任务。我们认为在这里的光度L*X和休息时间T*a（以下简称LT）的相关性，并调查是否有系统诱导的选择效应或红移依赖的校准。我们进行这种分析的全部样品的77个雨燕伽玛暴与已知的红移和子样品的伽玛暴具有典型的X射线光变曲线，以下称为U0095样品。我们没有发现任何系统的偏见，从而证实存在的物理伽玛暴子类揭示了其余辉性质的紧密相关性。此外，我们研究了应用LT相关作为红移估计的可能性，为全分布和正则光变曲线。较大的不确定性和不可忽略的固有散射使结果不那么令人鼓舞，但仍有一些提示促使进一步分析增加U0095样品。
Gamma-ray bursts (GRBs) are the most energetic sources in the universe and among the farthest known astrophysical sources. These features make them appealing candidates as standard candles for cosmological applications such that studying the physical mechanisms for the origin of the emission and correlations among their observable properties is an interesting task. We consider here the luminosity L*X and break time T*a (hereafter LT) correlation and investigate whether there are systematics induced by selection effects or redshift-dependent calibration. We perform this analysis both for the full sample of 77 Swift GRBs with known redshift and for the subsample of GRBs having canonical X-ray light curves, hereafter called the U0095 sample. We do not find any systematic bias, thus confirming the existence of physical GRB subclasses revealed by tight correlations of their afterglow properties. Furthermore, we study the possibility of applying the LT correlation as a redshift estimator both for the full distribution and for the canonical light curves. The large uncertainties and the non-negligible intrinsic scatter make the results not so encouraging, but there are nevertheless some hints motivating a further analysis with an increased U0095 sample.