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arXiv 1011.4342astro-ph.HE
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一种新的长伽玛暴频率-亮度关系?

A New Frequency-Luminosity Relation for Long GRBs?

T. N. Ukwatta, K. S. Dhuga, D. C. Morris, G. MacLachlan, W. C. Parke, L. C. Maximon, A. Eskandarian, N. Gehrels, J. P. Norris, A. Shenoy

摘要:

我们研究了206个长伽马射线暴(GRB)的功率密度谱(PDS)。我们用一个简单的幂律拟合PDS,并提取幂律指数(alpha)和噪声交叉阈值频率(f_th)。我们发现,所提取的α峰的分布在-1.4附近,并且f_th的分布在1Hz附近。此外,基于已知红移的58个爆发的子集,我们证明了红移校正的阈值频率与各向同性峰值亮度呈正相关。相关系数为0.57 +/- 0.03。

英文摘要:

We have studied power density spectra (PDS) of 206 long Gamma-Ray Bursts (GRBs). We fitted the PDS with a simple power-law and extracted the exponent of the power-law (alpha) and the noise-crossing threshold frequency (f_th). We find that the distribution of the extracted alpha peaks around -1.4 and that of f_th around 1 Hz. In addition, based on a sub-set of 58 bursts with known redshifts, we show that the redshift-corrected threshold frequency is positively correlated with the isotropic peak luminosity. The correlation coefficient is 0.57 +/- 0.03.

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