arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.01157astro-ph.HEastro-ph.IMphysics.data-an
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1366个BATSE星表长时伽马射线暴未知红移的多层经验贝叶斯估计

A Multilevel Empirical Bayesian Approach to Estimating the Unknown Redshifts of 1366 BATSE Catalog Long-Duration Gamma-Ray Bursts

Joshua A. Osborne, Amir Shahmoradi, Robert J. Nemiroff

摘要:

我们提出了一个由暴和瞬变源实验(BATSE)探测到的1366个单独的长持续时间伽马射线暴(LGRB)的概率红移估计的目录。这一结果是基于对1366个BATSE LGRB在5维红移空间中的总体分布和四个固有的瞬发伽马射线发射特性的仔细选择和建模:各向同性1024ms峰值亮度、总各向同性发射、光谱峰值能量,以及固有持续时间,同时仔细考虑样本不完整性的影响和BATSE的LGRB检测机制。我们的纯概率方法基于两个基本的合理假设:1。LGRB的轨迹,无论是准确或密切,宇宙恒星形成率和2。上述瞬发伽马射线发射特性的联合4维分布由多变量对数正态分布很好地描述。我们的建模方法使我们能够限制红移的个别BATSE LGRB的$0.36$和$0.96$平均不确定性范围内的$50\%$和$90\%$的置信水平,分别。我们的红移预测是完全不符合以前的红移估计BATSE LGRB计算通过提出的现象学的高能量的关系,特别是,明显的强相关性的LGRB的峰值亮度与光谱峰值能量,光变曲线的变化,和光谱滞后。我们的预测和以前的工作之间观察到的差异可以解释的强烈影响的探测器阈值和样品不完整性,在塑造这些唯象提出的高能相关文献。

英文摘要:

We present a catalog of the probabilistic redshift estimates and for 1366 individual Long-duration Gamma-Ray Bursts (LGRBs) detected by the Burst And Transient Source Experiment (BATSE). This result is based on a careful selection and modeling of the population distribution of 1366 BATSE LGRBs in the 5-dimensional space of redshift and the four intrinsic prompt gamma-ray emission properties: the isotropic 1024ms peak luminosity, the total isotropic emission, the spectral peak energy, as well as the intrinsic duration, while carefully taking into account the effects of sample incompleteness and the LGRB-detection mechanism of BATSE. Two fundamental plausible assumptions underlie our purely-probabilistic approach: 1. LGRBs trace, either exactly or closely, the Cosmic Star Formation Rate and 2. the joint 4-dimensional distribution of the aforementioned prompt gamma-ray emission properties is well-described by a multivariate log-normal distribution. Our modeling approach enables us to constrain the redshifts of individual BATSE LGRBs to within $0.36$ and $0.96$ average uncertainty ranges at $50\%$ and $90\%$ confidence levels, respectively. Our redshift predictions are completely at odds with the previous redshift estimates of BATSE LGRBs that were computed via the proposed phenomenological high-energy relations, specifically, the apparently-strong correlation of LGRBs' peak luminosity with the spectral peak energy, lightcurve variability, and the spectral lag. The observed discrepancies between our predictions and the previous works can be explained by the strong influence of detector threshold and sample-incompleteness in shaping these phenomenologically-proposed high-energy correlations in the literature.

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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