The updated luminosity correlations of gamma-ray bursts and cosmological implications
The updated luminosity correlations of gamma-ray bursts and cosmological implications
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伽马射线暴的最新光度相关性和宇宙学意义
DOI：
10.1111/j.1365-2966.2011.18961.x
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发表时间：
2011-04
影响因子：
4.8
通讯作者：
Dai, Zi-Gao
中科院分区：
文献类型：
--
作者：
Wang, Fa-Yin;Qi, Shi;Dai, Zi-Gao
伽玛射线暴（GRB）变量之间的光度关系近年来得到了广泛的讨论。在本文中，我们导出了六个光度关联式（$\tlag-L$，$\V-L$，$\epkk-L$，$\epkk-E_\gamma$，$\trt-L$，$\epkk-E_{\gamma，\mathrm{iso}$），包括低光子能量光变曲线与高光子能量光变曲线之间的时滞（$\tlag$），光变曲线的变异性（$V$），频谱的峰值能量（$\epkk$）和峰值的最小上升时间（$\trt$）。我们发现，$V-L$相关性的内在散射太大，似乎没有内在的相关性之间的两个参数使用最新的伽玛暴数据。当样本扩大时，其他五个相关性确实存在。与其他相关性相比，$\epkk-E_\gamma$相关性具有显著更低的内在散射。我们将全部数据分成四个红移箱测试时可能的演变与红移的相关性。我们没有发现统计上显著的证据红移的光度相关性的演变。为了避免在约束宇宙学参数时出现的圆度问题，我们采用极大似然法同时最小化了关联参数a，B和宇宙学参数.对于平坦的$\Lambda$CDM，最佳拟合为$\omm=0.31^{+0.13}_{-0.10}$。我们还约束的状态方程（EOS）的暗能量的可能的演化，使用伽玛暴与Union 2汇编的SNe Ia和$H（z）$的数据。结果是一致的宇宙常数在2\sigma$的置信水平，主要是由于伽玛射线暴数据，暗能量EOS显示轻微偏离-1在$z\geq 0. 5 $，持续与许多以前的数据集。
Several interesting luminosity correlations among gamma-ray burst (GRB) variables have been recently discussed extensively. In this paper, we derive the six luminosity correlations ($\tlag-L$, $V-L$, $\epkk-L$, $\epkk-E_\gamma$, $\trt-L$, $\epkk-E_{\gamma, \mathrm{iso}}$) from the light curves and spectra of the latest 116 long GRBs, including the time lag ($\tlag$) between low and high photon energy light curves, the variability ($V$) of the light curve, the peak energy of the spectrum ($\epkk$), and the minimum rise time ($\trt$) of the peaks. We find that the intrinsic scatter of the $V-L$ correlation is too large and there seems no inherent correlation between the two parameters using the latest GRB data. The other five correlations indeed exist when the sample is enlarged. The $\epkk-E_\gamma$ correlation has a significantly lower intrinsic scatter compared to the other correlations. We divide the full data into four redshift bins when testing possible evolution of the correlations with redshift. We find no statistically significant evidence for the redshift evolution of the luminosity correlations. To avoid the circularity problem when constraining the cosmological parameters, we simultaneously minimize $\chi^2$ with respect to both correlation parameters $a$, $b$ and the cosmological parameters using the maximum likelihood method. For the flat $\Lambda$CDM, the best fit is $\omm=0.31^{+0.13}_{-0.10}$. We also constrain the possible evolution of the equation of state (EOS) of the dark energy using the GRBs together with the Union2 compilation of SNe Ia and the $H(z)$ data. The result is consistent with the cosmological constant at $2 \sigma$ confidence level and mainly due to the GRB data, the dark energy EOS shows slight deviation from -1 at $z \geq0.5$ as was persistently presented with many previous data sets.
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影响因子：
1.8
作者：
N. Liang;Puxun Wu;Zong-hong Zhu
通讯作者：
N. Liang;Puxun Wu;Zong-hong Zhu
DOI：
10.1046/j.1365-8711.2003.06971.x
发表时间：
2002-12
影响因子：
4.8
作者：
D. Wei;W. Gao
通讯作者：
D. Wei;W. Gao
DOI：
10.1111/j.1365-2966.2007.11942.x
发表时间：
2005-10
影响因子：
4.8
作者：
Mo, H. J.;van den Bosch, Frank C.;Lin, W. P.;Li, Yun
通讯作者：
Li, Yun
DOI：
10.1086/424915
发表时间：
2004-08
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
G. Ghirlanda;G. Ghisellini;D. Lazzati;C. Firmani
通讯作者：
G. Ghirlanda;G. Ghisellini;D. Lazzati;C. Firmani
影响因子：
6.4
作者：
Scott T. Sullivan;A. Cooray;D. Holz
通讯作者：
Scott T. Sullivan;A. Cooray;D. Holz