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arXiv 1101.1676astro-ph.HEastro-ph.COgr-qchep-th
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伽马射线暴的L ~*X - Ta ~* 关联中可能的系统学研究

Study of possible systematics in the L*X - Ta* correlation of Gamma Ray Bursts

M. G. Dainotti, V. F. Cardone, S. Capozziello, M. Ostrowski, R. Willingale

摘要:

伽马射线暴(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。本文考虑了亮度L*X -突变时间Ta*(以下简称LT)的相关性,并研究了是否存在由选择效应或红移依赖的校正引起的系统学。我们进行这种分析的全部样品的77个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U 0095样品。我们没有发现任何系统的偏见,从而确认存在的物理伽玛暴子类揭示了密切相关的余辉性质。此外,我们研究了应用LT相关作为红移估计的可能性,为全分布和典型的光变曲线。较大的不确定性和不可忽略的内在分散性使结果不那么令人鼓舞,但仍有一些提示促使对增加的U 0095样品进行进一步分析。

英文摘要:

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 so 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 - break time Ta* (hereafter LT) correlation and investigate whether there are systematics induced by selection effects or redshift dependent calibra- tion. We perform this analysis both for the full sample of 77 GRBs with known redshift and for the subsample of GRBs having canonical X-ray light curves, hereafter called U0095 sample. We do not find any systematic bias thus con- firming 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 lightcurves. The large uncertainties and the non negligible intrin- sic scatter make the results not so encouraging, but there are nevertheless some hints motivating a further analysis with an increased U0095 sample.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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