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arXiv 2306.12840astro-ph.HEastro-ph.CO
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基于伽马射线暴三参数相关性的宇宙学参数限制

Constraints on the cosmological parameters with three-parameter correlation of Gamma-ray bursts

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

AI总结:

本文通过筛选具有相同物理起源的伽马射线暴样本,提出新的L0-tb-Ep,i三参数相关性作为标准烛光,并利用光学及X射线与光学组合样本对平坦和非平坦ΛCDM模型的宇宙学参数进行了限制。

摘要:

作为能量最高、最明亮的事件之一,伽马射线暴(GRBs)可被视为探测高红移宇宙的一种有前景的探针。与Ia型超新星(SNe Ia)类似,具有相同物理起源的GRBs可以被当作标准烛光。我们选取具有相同物理起源的GRB样本,并将其分为两组。一组由31个GRB组成,其X射线余辉光变曲线具有恒定光度的平台阶段特征,随后衰减指数约为-2;另一组包含50个在光学光变曲线中具有浅衰减阶段的GRB。对于所选GRB样本,我们确认平台光度$L_0$、平台结束时间$t_b$和各向同性能量释放$E_{\gamma,iso}$之间存在紧密相关性。我们还发现$L_0-t_b-E_{\gamma,iso}$相关性对宇宙学参数不敏感,利用该相关性无法获得对宇宙学参数的有效限制。我们探索了一种新的三参数相关性,即$L_0$、$t_b$和静止坐标系中的谱峰能量$E_{p,i}$($L_0-t_b-E_{p,i}$),并发现该相关性可以作为标准烛光来限制宇宙学参数。仅使用光学样本,对于平坦$Λ$CDM模型,我们得到$Ω_m = 0.697_{-0.278}^{+0.402}(1σ)$的限制。对于非平坦$Λ$CDM模型,最佳拟合结果为$Ω_m = 0.713_{-0.278}^{+0.346}$,$Ω_Λ = 0.981_{-0.580}^{+0.379}(1σ)$。对于X射线和光学样本的组合,对于平坦$Λ$CDM模型,我们得到$Ω_m = 0.313_{-0.125}^{+0.179}(1σ)$;对于非平坦$Λ$CDM模型,得到$Ω_m = 0.344_{-0.112}^{+0.176}$,$Ω_Λ = 0.770_{-0.416}^{+0.366}(1σ)$。

英文摘要:

As one of the most energetic and brightest events, gamma-ray bursts (GRBs) can be treated as a promising probe of the high-redshift universe. Similar to type Ia supernovae (SNe Ia), GRBs with same physical origin could be treated as standard candles. We select GRB samples with the same physical origin, which are divided into two groups. One group is consisted of 31 GRBs with a plateau phase feature of a constant luminosity followed by a decay index of about -2 in the X-ray afterglow light curves, and the other has 50 GRBs with a shallow decay phase in the optical light curves. For the selected GRB samples, we confirm that there is a tight correlation between the plateau luminosity $L_0$, the end time of plateau $t_b$ and the isotropic energy release $E_{γ,iso}$. We also find that the $L_0-t_b-E_{γ,iso}$ correlation is insensitive to the cosmological parameters and no valid limitations on the cosmological parameters can be obtained using this correlation. We explore a new three-parameter correlation $L_0$, $t_b$, and the spectral peak energy in the rest frame $E_{p,i}$ ($L_0-t_b-E_{p,i}$), and find that this correlation can be used as a standard candle to constrain the cosmological parameters. By employing the optical sample only, we find the constraints of $Ω_m = 0.697_{-0.278}^{+0.402}(1σ)$ for a flat $Λ$CDM model. For the non-flat $Λ$CDM model, the best-fitting results are $Ω_m = 0.713_{-0.278}^{+0.346}$, $Ω_Λ = 0.981_{-0.580}^{+0.379}(1σ)$. For the combination of the X-ray and optical smaples, we find $Ω_m = 0.313_{-0.125}^{+0.179}(1σ)$ for a flat $Λ$CDM model, and $Ω_m = 0.344_{-0.112}^{+0.176}$, $Ω_Λ = 0.770_{-0.416}^{+0.366}(1σ)$ for a non-flat $Λ$CDM model.

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