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arXiv 0710.1695astro-ph
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短伽马射线暴的大尺度角分布

On the large-scale angular distribution of short-Gamma ray bursts

A. Bernui, I. S. Ferreira, C. A. Wuensche

摘要:

利用一种新的无坐标方法研究了BATSE实验中短伽马射线暴(SGRB)的大尺度角分布。进行的分析考虑到在实验过程中的不均匀的天空曝光引起的角度相关性,以及在测量的角坐标的不确定性。比较大规模的角度相关性的数据与预期的模拟使用曝光功能,我们发现类似的功能。此外,面对大角度的相关性计算的数据与统计各向同性的假设下产生的模拟地图,我们发现,他们是不相容的95%的置信水平。然而,这样的差异仅限于角度刻度36 o-45 o,这可能是由于不均匀的天空曝光。该结果强烈表明来自BATSE的SGRB集合是本质上各向同性的。此外,我们还研究了这些数据与超星系平面的可能的大角度相关性。没有发现这种大尺度各向异性的证据。

英文摘要:

We investigate the large-scale angular distribution of the short-Gamma ray bursts (SGRBs) from BATSE experiment, using a new coordinates-free method. The analyses performed take into account the angular correlations induced by the non-uniform sky exposure during the experiment, and the uncertainty in the measured angular coordinates. Comparising the large-scale angular correlations from the data with those expected from simulations using the exposure function we find similar features. Additionally, confronting the large-angle correlations computed from the data with those obtained from simulated maps produced under the assumption of statistical isotropy we found that they are incompatible at 95% confidence level. However, such differences are restricted to the angular scales 36o - 45o, which are likely to be due to the non-uniform sky exposure. This result strongly suggests that the set of SGRBs from BATSE are intrinsically isotropic. Moreover, we also investigated a possible large-angle correlation of these data with the supergalactic plane. No evidence for such large-scale anisotropy was found.

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