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arXiv 2310.00596astro-ph.HEastro-ph.CO
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伽马射线暴余辉中的射电平台期及其在宇宙学中的应用

Radio Plateaus in Gamma-Ray Burst Afterglows and Their Application in Cosmology

Xiao Tian, Jia-Lun Li, Shuang-Xi Yi, Yu-Peng Yang, Jian-Ping Hu, Yan-Kun Qu, Fa-Yin Wang

AI总结:

本研究收集27个带射电平台期的伽马射线暴样本,推导射电平台期的多参数经验关系,探究其物理起源,并将其作为标准烛光结合其他探针约束宇宙学参数。

摘要:

射电余辉中的平台期仅在极少数伽马射线暴(GRB)中被观测到,本文从已发表文献中获取了27条具有平台期的射电光变曲线。我们得到了射电平台期的相关参数,例如平台期的时间指数($α_1$和$α_2$)、拐折时间($\text{T}_\text{b}^z$)以及对应的射电流量($F_{\rm b}$)。射电波段平台期拐折时间与对应拐折光度($\text{L}_\text{b}^z$)之间的双参数Dainotti关系为$\text{L}_\text{b}^z \times \text{T}_\text{b}^{-1.20\text{±}0.24}$。分别纳入各向同性能量$\text{E}_\text{iso}$和峰值能量$\text{E}_\text{pi}$后,射电平台期的三参数相关性分别为$\text{L}_\text{b}^z \times \text{T}_\text{b}^{-1.01 \text{±} 0.24} \text{E}_\text{iso}^{0.18 \text{±} 0.09}$以及$\text{L}_\text{b}^z \times \text{T}_\text{b}^{-1.18 \text{±} 0.27} \text{E}_\text{pi}^{0.05 \text{±} 0.28}$。这些相关性与X射线和光学平台期的相关性一致性较差,表明射电平台期可能具有不同的物理机制。特征频率穿越观测波段可能是导致射电余辉出现拐折的合理假说。我们将GRB的经验光度相关性校准为标准烛光以约束宇宙学参数,发现我们的样本可以很好地约束平坦$Λ$CDM模型,但对非平坦$Λ$CDM模型不敏感。通过将GRB与其他探针(如SN和CMB)相结合,对宇宙学参数的约束结果为:平坦$Λ$CDM模型的$\text{Ω}_\text{m}=0.297\text{±}0.006$,非平坦$Λ$CDM模型的$\text{Ω}_\text{m}=0.283\text{±}0.008$、$\text{Ω}_Λ=0.711\text{±}0.006$。

英文摘要:

The plateau phase in the radio afterglows has been observed in very few gamma-ray bursts (GRBs), and 27 radio light curves with plateau phase were acquired from the published literature in this article. We obtain the related parameters of the radio plateau, such as temporal indexes during the plateau phase ($α_1$ and $α_2$), break time ($\Tbz$) and the corresponding radio flux ($F_{\rm b}$). The two parameter Dainotti relation between the break time of the plateau and the corresponding break luminosity ($\Lbz$) in radio band is $\Lbz \propto \Tbz^{-1.20\pm0.24}$. Including the isotropic energy $\Eiso$ and the peak energy $\Epi$, the three parameter correlations for the radio plateaus are written as $\Lbz \propto \Tbz^{-1.01 \pm 0.24} \Eiso^{0.18 \pm 0.09}$ and $\Lbz \propto \Tbz^{-1.18 \pm 0.27} \Epi^{0.05 \pm 0.28}$, respectively. The correlations are less consistent with that of X-ray and optical plateaus, implying that radio plateaus may have a different physical mechanism. The typical frequencies crossing the observational band may be a reasonable hypothesis that causes the breaks of the radio afterglows. We calibrate GRBs empirical luminosity correlations as standard candle for constraining cosmological parameters, and find that our samples can constrain the flat $Λ$CDM model well, while are not sensitive to non-flat $Λ$CDM model. By combining GRBs with other probes, such as SN and CMB, the constraints on cosmological parameters are $\om = 0.297\pm0.006$ for the flat $Λ$CDM model and $\om = 0.283\pm0.008$, $\oL = 0.711\pm0.006$ for the non-flat $Λ$CDM model, respectively.

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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